[{"type":"preprint","project":[{"_id":"34bc2376-11ca-11ed-8bc3-9a3b3961a088","grant_number":"101045083","name":"Computational Discovery of Numerical Algorithms for Animation and Simulation of Natural Phenomena"}],"status":"public","_id":"12846","article_number":"2303.14555","author":[{"first_name":"Albert","full_name":"Chern, Albert","last_name":"Chern"},{"full_name":"Ishida, Sadashige","last_name":"Ishida","id":"6F7C4B96-A8E9-11E9-A7CA-09ECE5697425","first_name":"Sadashige"}],"article_processing_charge":"No","external_id":{"arxiv":["2303.14555"]},"title":"Area formula for spherical polygons via prequantization","department":[{"_id":"GradSch"},{"_id":"ChWo"}],"date_updated":"2023-04-25T06:51:21Z","citation":{"ieee":"A. Chern and S. Ishida, “Area formula for spherical polygons via prequantization,” arXiv. .","short":"A. Chern, S. Ishida, ArXiv (n.d.).","ama":"Chern A, Ishida S. Area formula for spherical polygons via prequantization. arXiv. doi:10.48550/arXiv.2303.14555","apa":"Chern, A., & Ishida, S. (n.d.). Area formula for spherical polygons via prequantization. arXiv. https://doi.org/10.48550/arXiv.2303.14555","mla":"Chern, Albert, and Sadashige Ishida. “Area Formula for Spherical Polygons via Prequantization.” ArXiv, 2303.14555, doi:10.48550/arXiv.2303.14555.","ista":"Chern A, Ishida S. Area formula for spherical polygons via prequantization. arXiv, 2303.14555.","chicago":"Chern, Albert, and Sadashige Ishida. “Area Formula for Spherical Polygons via Prequantization.” ArXiv, n.d. https://doi.org/10.48550/arXiv.2303.14555."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","oa":1,"main_file_link":[{"url":"https://arxiv.org/abs/2303.14555","open_access":"1"}],"month":"03","abstract":[{"lang":"eng","text":"We present a formula for the signed area of a spherical polygon via prequantization. In contrast to the traditional formula based on the Gauss-Bonnet theorem that requires measuring angles, the new formula mimics Green's theorem and is applicable to a wider range of degenerate spherical curves and polygons."}],"oa_version":"Preprint","acknowledgement":"The authors acknowledge Chris Wojtan for his continuous support to the present work through discussions and advice. The second author thanks Anna Sisak for a fruitful discussion on prequantum bundles. This project was funded in part by the European Research Council (ERC Consolidator Grant 101045083 CoDiNA).","doi":"10.48550/arXiv.2303.14555","date_published":"2023-03-25T00:00:00Z","date_created":"2023-04-18T19:16:06Z","year":"2023","publication_status":"submitted","day":"25","publication":"arXiv","language":[{"iso":"eng"}]},{"oa_version":"Published Version","abstract":[{"text":"We introduce a compact, intuitive procedural graph representation for cellular metamaterials, which are small-scale, tileable structures that can be architected to exhibit many useful material properties. Because the structures’ “architectures” vary widely—with elements such as beams, thin shells, and solid bulks—it is difficult to explore them using existing representations. Generic approaches like voxel grids are versatile, but it is cumbersome to represent and edit individual structures; architecture-specific approaches address these issues, but are incompatible with one another. By contrast, our procedural graph succinctly represents the construction process for any structure using a simple skeleton annotated with spatially varying thickness. To express the highly constrained triply periodic minimal surfaces (TPMS) in this manner, we present the first fully automated version of the conjugate surface construction method, which allows novices to create complex TPMS from intuitive input. We demonstrate our representation’s expressiveness, accuracy, and compactness by constructing a wide range of established structures and hundreds of novel structures with diverse architectures and material properties. We also conduct a user study to verify our representation’s ease-of-use and ability to expand engineers’ capacity for exploration.","lang":"eng"}],"month":"10","intvolume":" 42","file":[{"content_type":"application/zip","relation":"main_file","access_level":"open_access","success":1,"file_id":"14630","checksum":"0192f597d7a2ceaf89baddfd6190d4c8","file_size":95467870,"date_updated":"2023-11-29T15:16:01Z","creator":"yichen","file_name":"tog-22-0089-File004.zip","date_created":"2023-11-29T15:16:01Z"},{"success":1,"checksum":"7fb024963be81933494f38de191e4710","file_id":"14631","content_type":"application/zip","relation":"main_file","access_level":"open_access","file_name":"tog-22-0089-File005.zip","date_created":"2023-11-29T15:16:01Z","file_size":103731880,"date_updated":"2023-11-29T15:16:01Z","creator":"yichen"},{"success":1,"checksum":"b7d6829ce396e21cac9fae0ec7130a6b","file_id":"14638","content_type":"application/pdf","relation":"main_file","access_level":"open_access","file_name":"2023_ACMToG_Makatura.pdf","date_created":"2023-12-04T08:04:14Z","file_size":57067476,"date_updated":"2023-12-04T08:04:14Z","creator":"dernst"}],"language":[{"iso":"eng"}],"publication_identifier":{"issn":["0730-0301","1557-7368"]},"publication_status":"published","volume":42,"issue":"5","_id":"14628","status":"public","keyword":["Computer Graphics and Computer-Aided Design"],"article_type":"original","type":"journal_article","ddc":["531","006"],"date_updated":"2023-12-04T08:09:05Z","department":[{"_id":"GradSch"},{"_id":"ChWo"},{"_id":"BeBi"}],"file_date_updated":"2023-12-04T08:04:14Z","acknowledgement":"The authors thank Mina Konaković Luković and Michael Foshey for their early contributions to this project, David Palmer and Paul Zhang for their insightful discussions about minimal surfaces and the CSCM, Julian Panetta for providing the Elastic Textures code, and Hannes Hergeth for his feedback and support. We also thank our user study participants and anonymous reviewers.\r\nThis material is based upon work supported by the National Science Foundation\r\n(NSF) Graduate Research Fellowship under Grant No. 2141064; the MIT Morningside\r\nAcademy for Design Fellowship; the Defense Advanced Research Projects Agency\r\n(DARPA) Grant No. FA8750-20-C-0075; the ERC Consolidator Grant No. 101045083,\r\n“CoDiNA: Computational Discovery of Numerical Algorithms for Animation and Simulation of Natural Phenomena”; and the NewSat project, which is co-funded by the Operational Program for Competitiveness and Internationalisation (COMPETE2020), Portugal 2020, the European Regional Development Fund (ERDF), and the Portuguese Foundation for Science and Technology (FTC) under the MIT Portugal program.","publisher":"Association for Computing Machinery","quality_controlled":"1","oa":1,"day":"01","publication":"ACM Transactions on Graphics","has_accepted_license":"1","year":"2023","date_published":"2023-10-01T00:00:00Z","doi":"10.1145/3605389","date_created":"2023-11-29T15:02:03Z","article_number":"168","project":[{"name":"Computational Discovery of Numerical Algorithms for Animation and Simulation of Natural Phenomena","grant_number":"101045083","_id":"34bc2376-11ca-11ed-8bc3-9a3b3961a088"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"ista":"Makatura L, Wang B, Chen Y-L, Deng B, Wojtan C, Bickel B, Matusik W. 2023. Procedural metamaterials: A unified procedural graph for metamaterial design. ACM Transactions on Graphics. 42(5), 168.","chicago":"Makatura, Liane, Bohan Wang, Yi-Lu Chen, Bolei Deng, Chris Wojtan, Bernd Bickel, and Wojciech Matusik. “Procedural Metamaterials: A Unified Procedural Graph for Metamaterial Design.” ACM Transactions on Graphics. Association for Computing Machinery, 2023. https://doi.org/10.1145/3605389.","ieee":"L. Makatura et al., “Procedural metamaterials: A unified procedural graph for metamaterial design,” ACM Transactions on Graphics, vol. 42, no. 5. Association for Computing Machinery, 2023.","short":"L. Makatura, B. Wang, Y.-L. Chen, B. Deng, C. Wojtan, B. Bickel, W. Matusik, ACM Transactions on Graphics 42 (2023).","apa":"Makatura, L., Wang, B., Chen, Y.-L., Deng, B., Wojtan, C., Bickel, B., & Matusik, W. (2023). Procedural metamaterials: A unified procedural graph for metamaterial design. ACM Transactions on Graphics. Association for Computing Machinery. https://doi.org/10.1145/3605389","ama":"Makatura L, Wang B, Chen Y-L, et al. Procedural metamaterials: A unified procedural graph for metamaterial design. ACM Transactions on Graphics. 2023;42(5). doi:10.1145/3605389","mla":"Makatura, Liane, et al. “Procedural Metamaterials: A Unified Procedural Graph for Metamaterial Design.” ACM Transactions on Graphics, vol. 42, no. 5, 168, Association for Computing Machinery, 2023, doi:10.1145/3605389."},"title":"Procedural metamaterials: A unified procedural graph for metamaterial design","author":[{"first_name":"Liane","last_name":"Makatura","full_name":"Makatura, Liane"},{"last_name":"Wang","full_name":"Wang, Bohan","first_name":"Bohan"},{"full_name":"Chen, Yi-Lu","last_name":"Chen","first_name":"Yi-Lu","id":"0b467602-dbcd-11ea-9d1d-ed480aa46b70"},{"last_name":"Deng","full_name":"Deng, Bolei","first_name":"Bolei"},{"last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Bernd","id":"49876194-F248-11E8-B48F-1D18A9856A87","full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385","last_name":"Bickel"},{"last_name":"Matusik","full_name":"Matusik, Wojciech","first_name":"Wojciech"}],"article_processing_charge":"Yes (in subscription journal)"},{"department":[{"_id":"GradSch"},{"_id":"ChWo"}],"title":"Quantitative convergence of a discretization of dynamic optimal transport using the dual formulation","author":[{"full_name":"Ishida, Sadashige","last_name":"Ishida","id":"6F7C4B96-A8E9-11E9-A7CA-09ECE5697425","first_name":"Sadashige"},{"first_name":"Hugo","full_name":"Lavenant, Hugo","last_name":"Lavenant"}],"article_processing_charge":"No","external_id":{"arxiv":["2312.12213"]},"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","date_updated":"2023-12-27T13:44:33Z","citation":{"short":"S. Ishida, H. Lavenant, ArXiv (n.d.).","ieee":"S. Ishida and H. Lavenant, “Quantitative convergence of a discretization of dynamic optimal transport using the dual formulation,” arXiv. .","ama":"Ishida S, Lavenant H. Quantitative convergence of a discretization of dynamic optimal transport using the dual formulation. arXiv. doi:10.48550/arXiv.2312.12213","apa":"Ishida, S., & Lavenant, H. (n.d.). Quantitative convergence of a discretization of dynamic optimal transport using the dual formulation. arXiv. https://doi.org/10.48550/arXiv.2312.12213","mla":"Ishida, Sadashige, and Hugo Lavenant. “Quantitative Convergence of a Discretization of Dynamic Optimal Transport Using the Dual Formulation.” ArXiv, 2312.12213, doi:10.48550/arXiv.2312.12213.","ista":"Ishida S, Lavenant H. Quantitative convergence of a discretization of dynamic optimal transport using the dual formulation. arXiv, 2312.12213.","chicago":"Ishida, Sadashige, and Hugo Lavenant. “Quantitative Convergence of a Discretization of Dynamic Optimal Transport Using the Dual Formulation.” ArXiv, n.d. https://doi.org/10.48550/arXiv.2312.12213."},"status":"public","project":[{"name":"Computational Discovery of Numerical Algorithms for Animation and Simulation of Natural Phenomena","grant_number":"101045083","_id":"34bc2376-11ca-11ed-8bc3-9a3b3961a088"}],"keyword":["Optimal transport","Hamilton-Jacobi equation","convex optimization"],"type":"preprint","article_number":"2312.12213","_id":"14703","doi":"10.48550/arXiv.2312.12213","date_published":"2023-12-19T00:00:00Z","date_created":"2023-12-21T10:14:37Z","day":"19","publication":"arXiv","language":[{"iso":"eng"}],"year":"2023","publication_status":"submitted","month":"12","oa":1,"main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2312.12213"}],"oa_version":"Preprint","acknowledgement":"The authors would like to thank Chris Wojtan for his continuous support and several interesting discussions. Part of this research was performed during two visits: one of SI to the BIDSA research center at Bocconi University, and one of HL to the Institute of Science and Technology Austria. Both host institutions are warmly acknowledged for the hospital-\r\nity. HL is partially supported by the MUR-Prin 2022-202244A7YL “Gradient Flows and Non-Smooth Geometric Structures with Applications to Optimization and Machine Learning”, funded by the European Union - Next Generation EU. SI is supported in part by ERC Consolidator Grant 101045083 “CoDiNA” funded by the European Research Council.","abstract":[{"lang":"eng","text":"We present a discretization of the dynamic optimal transport problem for which we can obtain the convergence rate for the value of the transport cost to its continuous value when the temporal and spatial stepsize vanish. This convergence result does not require any regularity assumption on the measures, though experiments suggest that the rate is not sharp. Via an analysis of the duality gap we also obtain the convergence rates for the gradient of the optimal potentials and the velocity field under mild regularity assumptions. To obtain such rates we discretize the dual formulation of the dynamic optimal transport problem and use the mature literature related to the error due to discretizing the Hamilton-Jacobi equation."}]},{"abstract":[{"lang":"eng","text":"This paper introduces a novel method for simulating large bodies of water as a height field. At the start of each time step, we partition the waves into a bulk flow (which approximately satisfies the assumptions of the shallow water equations) and surface waves (which approximately satisfy the assumptions of Airy wave theory). We then solve the two wave regimes separately using appropriate state-of-the-art techniques, and re-combine the resulting wave velocities at the end of each step. This strategy leads to the first heightfield wave model capable of simulating complex interactions between both deep and shallow water effects, like the waves from a boat wake sloshing up onto a beach, or a dam break producing wave interference patterns and eddies. We also analyze the numerical dispersion created by our method and derive an exact correction factor for waves at a constant water depth, giving us a numerically perfect re-creation of theoretical water wave dispersion patterns."}],"acknowledged_ssus":[{"_id":"ScienComp"}],"oa_version":"Published Version","scopus_import":"1","month":"08","intvolume":" 42","publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"publication_status":"published","file":[{"relation":"main_file","access_level":"open_access","content_type":"video/mp4","success":1,"file_id":"14704","checksum":"1d178bb2f8011d9f5aedda6427e18c7a","creator":"sjeschke","file_size":511572575,"date_updated":"2023-12-21T12:26:40Z","file_name":"PaperVideo_final.mp4","date_created":"2023-12-21T12:26:40Z"},{"creator":"dernst","file_size":7469177,"date_updated":"2024-01-02T09:34:27Z","file_name":"2023_ACMToG_Jeschke.pdf","date_created":"2024-01-02T09:34:27Z","relation":"main_file","access_level":"open_access","content_type":"application/pdf","success":1,"checksum":"a49b2e744d5cd1276bb8b2e0ce6dc638","file_id":"14725"}],"language":[{"iso":"eng"}],"issue":"4","volume":42,"license":"https://creativecommons.org/licenses/by/4.0/","_id":"14240","article_type":"original","type":"journal_article","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"status":"public","date_updated":"2024-01-02T09:35:55Z","ddc":["000"],"department":[{"_id":"ChWo"}],"file_date_updated":"2024-01-02T09:34:27Z","acknowledgement":"We thank Georg Sperl for helping with early research for this paper, Mickael Ly and Yi-Lu Chen for proofreading, and members of the ISTA Visual Computing Group for general feedback. This project was funded in part by the European Research Council (ERC Consolidator Grant 101045083 CoDiNA).\r\nThe motorboat and sailboat were modeled by Sergei and the palmtrees by YadroGames. The environment map was created by Emil Persson.","publisher":"Association for Computing Machinery","quality_controlled":"1","oa":1,"isi":1,"has_accepted_license":"1","year":"2023","day":"01","publication":"ACM Transactions on Graphics","doi":"10.1145/3592098","date_published":"2023-08-01T00:00:00Z","date_created":"2023-08-27T22:01:17Z","article_number":"83","project":[{"grant_number":"101045083","name":"Computational Discovery of Numerical Algorithms for Animation and Simulation of Natural Phenomena","_id":"34bc2376-11ca-11ed-8bc3-9a3b3961a088"}],"citation":{"apa":"Jeschke, S., & Wojtan, C. (2023). Generalizing shallow water simulations with dispersive surface waves. ACM Transactions on Graphics. Association for Computing Machinery. https://doi.org/10.1145/3592098","ama":"Jeschke S, Wojtan C. Generalizing shallow water simulations with dispersive surface waves. ACM Transactions on Graphics. 2023;42(4). doi:10.1145/3592098","short":"S. Jeschke, C. Wojtan, ACM Transactions on Graphics 42 (2023).","ieee":"S. Jeschke and C. Wojtan, “Generalizing shallow water simulations with dispersive surface waves,” ACM Transactions on Graphics, vol. 42, no. 4. Association for Computing Machinery, 2023.","mla":"Jeschke, Stefan, and Chris Wojtan. “Generalizing Shallow Water Simulations with Dispersive Surface Waves.” ACM Transactions on Graphics, vol. 42, no. 4, 83, Association for Computing Machinery, 2023, doi:10.1145/3592098.","ista":"Jeschke S, Wojtan C. 2023. Generalizing shallow water simulations with dispersive surface waves. ACM Transactions on Graphics. 42(4), 83.","chicago":"Jeschke, Stefan, and Chris Wojtan. “Generalizing Shallow Water Simulations with Dispersive Surface Waves.” ACM Transactions on Graphics. Association for Computing Machinery, 2023. https://doi.org/10.1145/3592098."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"full_name":"Jeschke, Stefan","last_name":"Jeschke","first_name":"Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"external_id":{"isi":["001044671300049"]},"article_processing_charge":"Yes (in subscription journal)","title":"Generalizing shallow water simulations with dispersive surface waves"},{"article_number":"5","_id":"14748","status":"public","project":[{"_id":"34bc2376-11ca-11ed-8bc3-9a3b3961a088","name":"Computational Discovery of Numerical Algorithms for Animation and Simulation of Natural Phenomena","grant_number":"101045083"}],"conference":{"location":"Los Angeles, CA, United States","end_date":"2023-08-06","start_date":"2023-08-04","name":"SCA: Symposium on Computer Animation"},"type":"conference_abstract","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"chicago":"Chen, Yi-Lu, Mickaël Ly, and Chris Wojtan. “Unified Treatment of Contact, Friction and Shock-Propagation in Rigid Body Animation.” In Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation. Association for Computing Machinery, 2023. https://doi.org/10.1145/3606037.3606836.","ista":"Chen Y-L, Ly M, Wojtan C. 2023. Unified treatment of contact, friction and shock-propagation in rigid body animation. Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation. SCA: Symposium on Computer Animation, 5.","mla":"Chen, Yi-Lu, et al. “Unified Treatment of Contact, Friction and Shock-Propagation in Rigid Body Animation.” Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation, 5, Association for Computing Machinery, 2023, doi:10.1145/3606037.3606836.","ama":"Chen Y-L, Ly M, Wojtan C. Unified treatment of contact, friction and shock-propagation in rigid body animation. In: Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation. Association for Computing Machinery; 2023. doi:10.1145/3606037.3606836","apa":"Chen, Y.-L., Ly, M., & Wojtan, C. (2023). Unified treatment of contact, friction and shock-propagation in rigid body animation. In Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation. Los Angeles, CA, United States: Association for Computing Machinery. https://doi.org/10.1145/3606037.3606836","ieee":"Y.-L. Chen, M. Ly, and C. Wojtan, “Unified treatment of contact, friction and shock-propagation in rigid body animation,” in Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation, Los Angeles, CA, United States, 2023.","short":"Y.-L. Chen, M. Ly, C. Wojtan, in:, Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation, Association for Computing Machinery, 2023."},"date_updated":"2024-02-28T12:51:40Z","department":[{"_id":"ChWo"}],"title":"Unified treatment of contact, friction and shock-propagation in rigid body animation","article_processing_charge":"No","author":[{"last_name":"Chen","full_name":"Chen, Yi-Lu","id":"0b467602-dbcd-11ea-9d1d-ed480aa46b70","first_name":"Yi-Lu"},{"id":"6340d7f0-b48d-11eb-b10d-b7487e71d9f1","first_name":"Mickaël","last_name":"Ly","full_name":"Ly, Mickaël"},{"first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan"}],"acknowledgement":"We thank the anonymous reviewers and the members of the Visual Computing Group at ISTA for their helpful comments. This research was supported by the Scientific Service Units (SSU) of ISTA through resources provided by Scientific Computing, and was funded in part by the European Union (ERC-2021-COG 101045083 CoDiNA).","oa_version":"None","acknowledged_ssus":[{"_id":"ScienComp"}],"month":"08","quality_controlled":"1","publisher":"Association for Computing Machinery","publication":"Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation","language":[{"iso":"eng"}],"day":"01","publication_status":"published","year":"2023","publication_identifier":{"isbn":["9798400702686"]},"date_created":"2024-01-08T13:00:24Z","doi":"10.1145/3606037.3606836","date_published":"2023-08-01T00:00:00Z"},{"project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","citation":{"chicago":"Schreck, Camille, and Chris Wojtan. “Coupling 3D Liquid Simulation with 2D Wave Propagation for Large Scale Water Surface Animation Using the Equivalent Sources Method.” Computer Graphics Forum. Wiley, 2022. https://doi.org/10.1111/cgf.14478.","ista":"Schreck C, Wojtan C. 2022. Coupling 3D liquid simulation with 2D wave propagation for large scale water surface animation using the equivalent sources method. Computer Graphics Forum. 41(2), 343–353.","mla":"Schreck, Camille, and Chris Wojtan. “Coupling 3D Liquid Simulation with 2D Wave Propagation for Large Scale Water Surface Animation Using the Equivalent Sources Method.” Computer Graphics Forum, vol. 41, no. 2, Wiley, 2022, pp. 343–53, doi:10.1111/cgf.14478.","apa":"Schreck, C., & Wojtan, C. (2022). Coupling 3D liquid simulation with 2D wave propagation for large scale water surface animation using the equivalent sources method. Computer Graphics Forum. Wiley. https://doi.org/10.1111/cgf.14478","ama":"Schreck C, Wojtan C. Coupling 3D liquid simulation with 2D wave propagation for large scale water surface animation using the equivalent sources method. Computer Graphics Forum. 2022;41(2):343-353. doi:10.1111/cgf.14478","ieee":"C. Schreck and C. Wojtan, “Coupling 3D liquid simulation with 2D wave propagation for large scale water surface animation using the equivalent sources method,” Computer Graphics Forum, vol. 41, no. 2. Wiley, pp. 343–353, 2022.","short":"C. Schreck, C. Wojtan, Computer Graphics Forum 41 (2022) 343–353."},"title":"Coupling 3D liquid simulation with 2D wave propagation for large scale water surface animation using the equivalent sources method","article_processing_charge":"No","external_id":{"isi":["000802723900027"]},"author":[{"full_name":"Schreck, Camille","last_name":"Schreck","first_name":"Camille","id":"2B14B676-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"acknowledgement":"We wish to thank the anonymous reviewers and the members of the Visual Computing Group at IST Austria and MFX Team at INRIA for their valuable feedback. This research was supported by the Scientific Service Units (SSU) of IST Austria through resources provided by Scientific Computing. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 638176.","oa":1,"publisher":"Wiley","quality_controlled":"1","publication":"Computer Graphics Forum","day":"01","year":"2022","isi":1,"date_created":"2022-06-05T22:01:49Z","doi":"10.1111/cgf.14478","date_published":"2022-05-01T00:00:00Z","page":"343-353","_id":"11432","status":"public","article_type":"original","type":"journal_article","date_updated":"2023-08-02T06:44:05Z","department":[{"_id":"ChWo"}],"oa_version":"Submitted Version","abstract":[{"lang":"eng","text":"This paper proposes a method for simulating liquids in large bodies of water by coupling together a water surface wave simulator with a 3D Navier-Stokes simulator. The surface wave simulation uses the equivalent sources method (ESM) to efficiently animate large bodies of water with precisely controllable wave propagation behavior. The 3D liquid simulator animates complex non-linear fluid behaviors like splashes and breaking waves using off-the-shelf simulators using FLIP or the level set method with semi-Lagrangian advection.\r\nWe combine the two approaches by using the 3D solver to animate localized non-linear behaviors, and the 2D wave solver to animate larger regions with linear surface physics. We use the surface motion from the 3D solver as boundary conditions for 2D surface wave simulator, and we use the velocity and surface heights from the 2D surface wave simulator as boundary conditions for the 3D fluid simulation. We also introduce a novel technique for removing visual artifacts caused by numerical errors in 3D fluid solvers: we use experimental data to estimate the artificial dispersion caused by the 3D solver and we then carefully tune the wave speeds of the 2D solver to match it, effectively eliminating any differences in wave behavior across the boundary. To the best of our knowledge, this is the first time such a empirically driven error compensation approach has been used to remove coupling errors from a physics simulator.\r\nOur coupled simulation approach leverages the strengths of each simulation technique, animating large environments with seamless transitions between 2D and 3D physics."}],"acknowledged_ssus":[{"_id":"ScienComp"}],"intvolume":" 41","month":"05","main_file_link":[{"url":"https://hal.archives-ouvertes.fr/hal-03641349/","open_access":"1"}],"scopus_import":"1","language":[{"iso":"eng"}],"publication_status":"published","publication_identifier":{"eissn":["1467-8659"],"issn":["0167-7055"]},"ec_funded":1,"volume":41,"issue":"2"},{"abstract":[{"text":"We revisit two basic Direct Simulation Monte Carlo Methods to model aggregation kinetics and extend them for aggregation processes with collisional fragmentation (shattering). We test the performance and accuracy of the extended methods and compare their performance with efficient deterministic finite-difference method applied to the same model. We validate the stochastic methods on the test problems and apply them to verify the existence of oscillating regimes in the aggregation-fragmentation kinetics recently detected in deterministic simulations. We confirm the emergence of steady oscillations of densities in such systems and prove the stability of the\r\noscillations with respect to fluctuations and noise.","lang":"eng"}],"oa_version":"Preprint","main_file_link":[{"url":"https://doi.org/10.48550/arXiv.2103.09481","open_access":"1"}],"month":"10","intvolume":" 467","publication_identifier":{"issn":["0021-9991"]},"publication_status":"published","language":[{"iso":"eng"}],"volume":467,"_id":"11556","article_type":"original","type":"journal_article","status":"public","keyword":["Computer Science Applications","Physics and Astronomy (miscellaneous)","Applied Mathematics","Computational Mathematics","Modeling and Simulation","Numerical Analysis"],"date_updated":"2023-08-03T11:55:06Z","ddc":["518"],"department":[{"_id":"GradSch"},{"_id":"ChWo"}],"acknowledgement":"Zhores supercomputer of Skolkovo Institute of Science and Technology [68] has been used in the present research. S.A.M. was supported by Moscow Center for Fundamental and Applied Mathematics (the agreement with the Ministry of Education and Science of the Russian Federation No. 075-15-2019-1624). A.I.O. acknowledges RFBR project No. 20-31-90022. N.V.B. acknowledges the support of the Analytical Center (subsidy agreement 000000D730321P5Q0002, Grant No. 70-2021-00145 02.11.2021).","quality_controlled":"1","publisher":"Elsevier","oa":1,"isi":1,"year":"2022","day":"15","publication":"Journal of Computational Physics","doi":"10.1016/j.jcp.2022.111439","date_published":"2022-10-15T00:00:00Z","date_created":"2022-07-11T12:19:59Z","article_number":"111439","citation":{"ama":"Kalinov A, Osinskiy AI, Matveev SA, Otieno W, Brilliantov NV. Direct simulation Monte Carlo for new regimes in aggregation-fragmentation kinetics. Journal of Computational Physics. 2022;467. doi:10.1016/j.jcp.2022.111439","apa":"Kalinov, A., Osinskiy, A. I., Matveev, S. A., Otieno, W., & Brilliantov, N. V. (2022). Direct simulation Monte Carlo for new regimes in aggregation-fragmentation kinetics. Journal of Computational Physics. Elsevier. https://doi.org/10.1016/j.jcp.2022.111439","short":"A. Kalinov, A.I. Osinskiy, S.A. Matveev, W. Otieno, N.V. Brilliantov, Journal of Computational Physics 467 (2022).","ieee":"A. Kalinov, A. I. Osinskiy, S. A. Matveev, W. Otieno, and N. V. Brilliantov, “Direct simulation Monte Carlo for new regimes in aggregation-fragmentation kinetics,” Journal of Computational Physics, vol. 467. Elsevier, 2022.","mla":"Kalinov, Aleksei, et al. “Direct Simulation Monte Carlo for New Regimes in Aggregation-Fragmentation Kinetics.” Journal of Computational Physics, vol. 467, 111439, Elsevier, 2022, doi:10.1016/j.jcp.2022.111439.","ista":"Kalinov A, Osinskiy AI, Matveev SA, Otieno W, Brilliantov NV. 2022. Direct simulation Monte Carlo for new regimes in aggregation-fragmentation kinetics. Journal of Computational Physics. 467, 111439.","chicago":"Kalinov, Aleksei, A.I. Osinskiy, S.A. Matveev, W. Otieno, and N.V. Brilliantov. “Direct Simulation Monte Carlo for New Regimes in Aggregation-Fragmentation Kinetics.” Journal of Computational Physics. Elsevier, 2022. https://doi.org/10.1016/j.jcp.2022.111439."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","author":[{"first_name":"Aleksei","id":"44b7120e-eb97-11eb-a6c2-e1557aa81d02","orcid":"0000-0003-2189-3904","full_name":"Kalinov, Aleksei","last_name":"Kalinov"},{"first_name":"A.I.","full_name":"Osinskiy, A.I.","last_name":"Osinskiy"},{"first_name":"S.A.","last_name":"Matveev","full_name":"Matveev, S.A."},{"first_name":"W.","last_name":"Otieno","full_name":"Otieno, W."},{"first_name":"N.V.","last_name":"Brilliantov","full_name":"Brilliantov, N.V."}],"article_processing_charge":"No","external_id":{"arxiv":["2103.09481"],"isi":["000917225500013"]},"title":"Direct simulation Monte Carlo for new regimes in aggregation-fragmentation kinetics"},{"publication":"ACM Transactions on Graphics","day":"22","year":"2022","isi":1,"date_created":"2022-08-07T22:01:58Z","date_published":"2022-07-22T00:00:00Z","doi":"10.1145/3528223.3530167","acknowledgement":"We wish to thank the anonymous reviewers for their helpful comments. To develop this project, we were helped by many people both at Under Armour (Clay Dean, Randall Harward, Kyle Blakely, Craig Simile, Michael Seiz, Brooke Malone, Brittainy McFarland, Emilie Phan, Lindsey Kern, Courtney Oswald, Haley Barkley, Bob Chin, Adam Bayer, Connie Kwok, Marielle Newman, Nick Pence, Allison Hicks, Allison White, Candace Rubenstein, Jeremy Stangland, Fred Fagergren, Michael Mazzoleni, Nathaniel Berry, Manuel Frank) and SEDDI (Gabriel Cirio, Alejandro Rodríguez, Sofía Dominguez, Alicia Nicas, Elena Garcés, Daniel Rodríguez, David Pascual, Manuel Godoy, Sergio Suja, Sergio Ruiz, Roberto Condori, Alberto Martín, Graham Sullivan). We also thank the members of the Visual Computing Group at IST Austria and the Multimodal Simulation Lab at URJC for their feedback. This research was supported by the Scientific Service Units (SSU) of IST Austria through resources provided by Scientific Computing, and it was funded in part by the European Research Council (ERC Consolidator Grant 772738 TouchDesign).","oa":1,"publisher":"Association for Computing Machinery","quality_controlled":"1","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","citation":{"ista":"Sperl G, Sánchez-Banderas RM, Li M, Wojtan C, Otaduy MA. 2022. Estimation of yarn-level simulation models for production fabrics. ACM Transactions on Graphics. 41(4), 65.","chicago":"Sperl, Georg, Rosa M. Sánchez-Banderas, Manwen Li, Chris Wojtan, and Miguel A. Otaduy. “Estimation of Yarn-Level Simulation Models for Production Fabrics.” ACM Transactions on Graphics. Association for Computing Machinery, 2022. https://doi.org/10.1145/3528223.3530167.","apa":"Sperl, G., Sánchez-Banderas, R. M., Li, M., Wojtan, C., & Otaduy, M. A. (2022). Estimation of yarn-level simulation models for production fabrics. ACM Transactions on Graphics. Association for Computing Machinery. https://doi.org/10.1145/3528223.3530167","ama":"Sperl G, Sánchez-Banderas RM, Li M, Wojtan C, Otaduy MA. Estimation of yarn-level simulation models for production fabrics. ACM Transactions on Graphics. 2022;41(4). doi:10.1145/3528223.3530167","short":"G. Sperl, R.M. Sánchez-Banderas, M. Li, C. Wojtan, M.A. Otaduy, ACM Transactions on Graphics 41 (2022).","ieee":"G. Sperl, R. M. Sánchez-Banderas, M. Li, C. Wojtan, and M. A. Otaduy, “Estimation of yarn-level simulation models for production fabrics,” ACM Transactions on Graphics, vol. 41, no. 4. Association for Computing Machinery, 2022.","mla":"Sperl, Georg, et al. “Estimation of Yarn-Level Simulation Models for Production Fabrics.” ACM Transactions on Graphics, vol. 41, no. 4, 65, Association for Computing Machinery, 2022, doi:10.1145/3528223.3530167."},"title":"Estimation of yarn-level simulation models for production fabrics","external_id":{"isi":["000830989200114"]},"article_processing_charge":"No","author":[{"full_name":"Sperl, Georg","last_name":"Sperl","first_name":"Georg","id":"4DD40360-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Sánchez-Banderas","full_name":"Sánchez-Banderas, Rosa M.","first_name":"Rosa M."},{"first_name":"Manwen","last_name":"Li","full_name":"Li, Manwen"},{"last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Miguel A.","full_name":"Otaduy, Miguel A.","last_name":"Otaduy"}],"article_number":"65","language":[{"iso":"eng"}],"publication_status":"published","publication_identifier":{"eissn":["1557-7368"],"issn":["0730-0301"]},"issue":"4","related_material":{"link":[{"relation":"press_release","url":"https://ista.ac.at/en/news/digital-yarn-real-socks/","description":"News on the ISTA website"}],"record":[{"relation":"dissertation_contains","status":"public","id":"12358"}]},"volume":41,"oa_version":"Published Version","acknowledged_ssus":[{"_id":"ScienComp"}],"abstract":[{"lang":"eng","text":"This paper introduces a methodology for inverse-modeling of yarn-level mechanics of cloth, based on the mechanical response of fabrics in the real world. We compiled a database from physical tests of several different knitted fabrics used in the textile industry. These data span different types of complex knit patterns, yarn compositions, and fabric finishes, and the results demonstrate diverse physical properties like stiffness, nonlinearity, and anisotropy.\r\n\r\nWe then develop a system for approximating these mechanical responses with yarn-level cloth simulation. To do so, we introduce an efficient pipeline for converting between fabric-level data and yarn-level simulation, including a novel swatch-level approximation for speeding up computation, and some small-but-necessary extensions to yarn-level models used in computer graphics. The dataset used for this paper can be found at http://mslab.es/projects/YarnLevelFabrics."}],"intvolume":" 41","month":"07","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1145/3528223.3530167"}],"scopus_import":"1","date_updated":"2023-08-03T12:38:30Z","department":[{"_id":"ChWo"}],"_id":"11736","status":"public","type":"journal_article","article_type":"original"},{"department":[{"_id":"ChWo"}],"file_date_updated":"2023-01-30T07:15:48Z","date_updated":"2023-08-04T09:37:23Z","ddc":["000"],"article_type":"original","type":"journal_article","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"status":"public","_id":"12431","volume":41,"issue":"6","publication_identifier":{"eissn":["1557-7368"],"issn":["0730-0301"]},"publication_status":"published","file":[{"file_name":"2022_ACM_Ishida.pdf","date_created":"2023-01-30T07:15:48Z","file_size":15551202,"date_updated":"2023-01-30T07:15:48Z","creator":"dernst","success":1,"checksum":"a2fba257fdefe0e747182be6c0f7c70c","file_id":"12433","content_type":"application/pdf","relation":"main_file","access_level":"open_access"}],"language":[{"iso":"eng"}],"scopus_import":"1","month":"12","intvolume":" 41","abstract":[{"lang":"eng","text":"This paper presents a new representation of curve dynamics, with applications to vortex filaments in fluid dynamics. Instead of representing these filaments with explicit curve geometry and Lagrangian equations of motion, we represent curves implicitly with a new co-dimensional 2 level set description. Our implicit representation admits several redundant mathematical degrees of freedom in both the configuration and the dynamics of the curves, which can be tailored specifically to improve numerical robustness, in contrast to naive approaches for implicit curve dynamics that suffer from overwhelming numerical stability problems. Furthermore, we note how these hidden degrees of freedom perfectly map to a Clebsch representation in fluid dynamics. Motivated by these observations, we introduce untwisted level set functions and non-swirling dynamics which successfully regularize sources of numerical instability, particularly in the twisting modes around curve filaments. A consequence is a novel simulation method which produces stable dynamics for large numbers of interacting vortex filaments and effortlessly handles topological changes and re-connection events."}],"oa_version":"Published Version","author":[{"full_name":"Ishida, Sadashige","last_name":"Ishida","id":"6F7C4B96-A8E9-11E9-A7CA-09ECE5697425","first_name":"Sadashige"},{"last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"},{"last_name":"Chern","full_name":"Chern, Albert","first_name":"Albert"}],"article_processing_charge":"No","external_id":{"isi":["000891651900061"]},"title":"Hidden degrees of freedom in implicit vortex filaments","citation":{"ama":"Ishida S, Wojtan C, Chern A. Hidden degrees of freedom in implicit vortex filaments. ACM Transactions on Graphics. 2022;41(6). doi:10.1145/3550454.3555459","apa":"Ishida, S., Wojtan, C., & Chern, A. (2022). Hidden degrees of freedom in implicit vortex filaments. ACM Transactions on Graphics. Association for Computing Machinery. https://doi.org/10.1145/3550454.3555459","short":"S. Ishida, C. Wojtan, A. Chern, ACM Transactions on Graphics 41 (2022).","ieee":"S. Ishida, C. Wojtan, and A. Chern, “Hidden degrees of freedom in implicit vortex filaments,” ACM Transactions on Graphics, vol. 41, no. 6. Association for Computing Machinery, 2022.","mla":"Ishida, Sadashige, et al. “Hidden Degrees of Freedom in Implicit Vortex Filaments.” ACM Transactions on Graphics, vol. 41, no. 6, 241, Association for Computing Machinery, 2022, doi:10.1145/3550454.3555459.","ista":"Ishida S, Wojtan C, Chern A. 2022. Hidden degrees of freedom in implicit vortex filaments. ACM Transactions on Graphics. 41(6), 241.","chicago":"Ishida, Sadashige, Chris Wojtan, and Albert Chern. “Hidden Degrees of Freedom in Implicit Vortex Filaments.” ACM Transactions on Graphics. Association for Computing Machinery, 2022. https://doi.org/10.1145/3550454.3555459."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","project":[{"name":"Computational Discovery of Numerical Algorithms for Animation and Simulation of Natural Phenomena","grant_number":"101045083","_id":"34bc2376-11ca-11ed-8bc3-9a3b3961a088"}],"article_number":"241","doi":"10.1145/3550454.3555459","date_published":"2022-12-01T00:00:00Z","date_created":"2023-01-29T23:00:59Z","has_accepted_license":"1","isi":1,"year":"2022","day":"01","publication":"ACM Transactions on Graphics","publisher":"Association for Computing Machinery","quality_controlled":"1","oa":1,"acknowledgement":"We thank the visual computing group at IST Austria for their valuable discussions and feedback. Houdini Education licenses were provided by SideFX software. This project was funded in part by the European Research Council (ERC Consolidator Grant 101045083 CoDiNA)."},{"publisher":"Institute of Science and Technology Austria","oa":1,"has_accepted_license":"1","year":"2022","day":"22","page":"138","doi":"10.15479/at:ista:12103","date_published":"2022-09-22T00:00:00Z","date_created":"2023-01-24T10:49:46Z","project":[{"_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"}],"citation":{"ista":"Sperl G. 2022. Homogenizing yarn simulations: Large-scale mechanics, small-scale detail, and quantitative fitting. Institute of Science and Technology Austria.","chicago":"Sperl, Georg. “Homogenizing Yarn Simulations: Large-Scale Mechanics, Small-Scale Detail, and Quantitative Fitting.” Institute of Science and Technology Austria, 2022. https://doi.org/10.15479/at:ista:12103.","short":"G. Sperl, Homogenizing Yarn Simulations: Large-Scale Mechanics, Small-Scale Detail, and Quantitative Fitting, Institute of Science and Technology Austria, 2022.","ieee":"G. Sperl, “Homogenizing yarn simulations: Large-scale mechanics, small-scale detail, and quantitative fitting,” Institute of Science and Technology Austria, 2022.","apa":"Sperl, G. (2022). Homogenizing yarn simulations: Large-scale mechanics, small-scale detail, and quantitative fitting. Institute of Science and Technology Austria. https://doi.org/10.15479/at:ista:12103","ama":"Sperl G. Homogenizing yarn simulations: Large-scale mechanics, small-scale detail, and quantitative fitting. 2022. doi:10.15479/at:ista:12103","mla":"Sperl, Georg. Homogenizing Yarn Simulations: Large-Scale Mechanics, Small-Scale Detail, and Quantitative Fitting. Institute of Science and Technology Austria, 2022, doi:10.15479/at:ista:12103."},"user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","author":[{"last_name":"Sperl","full_name":"Sperl, Georg","first_name":"Georg","id":"4DD40360-F248-11E8-B48F-1D18A9856A87"}],"article_processing_charge":"No","title":"Homogenizing yarn simulations: Large-scale mechanics, small-scale detail, and quantitative fitting","acknowledged_ssus":[{"_id":"SSU"}],"abstract":[{"text":"The complex yarn structure of knitted and woven fabrics gives rise to both a mechanical and\r\nvisual complexity. The small-scale interactions of yarns colliding with and pulling on each\r\nother result in drastically different large-scale stretching and bending behavior, introducing\r\nanisotropy, curling, and more. While simulating cloth as individual yarns can reproduce this\r\ncomplexity and match the quality of real fabric, it may be too computationally expensive for\r\nlarge fabrics. On the other hand, continuum-based approaches do not need to discretize the\r\ncloth at a stitch-level, but it is non-trivial to find a material model that would replicate the\r\nlarge-scale behavior of yarn fabrics, and they discard the intricate visual detail. In this thesis,\r\nwe discuss three methods to try and bridge the gap between small-scale and large-scale yarn\r\nmechanics using numerical homogenization: fitting a continuum model to periodic yarn simulations, adding mechanics-aware yarn detail onto thin-shell simulations, and quantitatively\r\nfitting yarn parameters to physical measurements of real fabric.\r\nTo start, we present a method for animating yarn-level cloth effects using a thin-shell solver.\r\nWe first use a large number of periodic yarn-level simulations to build a model of the potential\r\nenergy density of the cloth, and then use it to compute forces in a thin-shell simulator. The\r\nresulting simulations faithfully reproduce expected effects like the stiffening of woven fabrics\r\nand the highly deformable nature and anisotropy of knitted fabrics at a fraction of the cost of\r\nfull yarn-level simulation.\r\nWhile our thin-shell simulations are able to capture large-scale yarn mechanics, they lack\r\nthe rich visual detail of yarn-level simulations. Therefore, we propose a method to animate\r\nyarn-level cloth geometry on top of an underlying deforming mesh in a mechanics-aware\r\nfashion in real time. Using triangle strains to interpolate precomputed yarn geometry, we are\r\nable to reproduce effects such as knit loops tightening under stretching at negligible cost.\r\nFinally, we introduce a methodology for inverse-modeling of yarn-level mechanics of cloth,\r\nbased on the mechanical response of fabrics in the real world. We compile a database from\r\nphysical tests of several knitted fabrics used in the textile industry spanning diverse physical\r\nproperties like stiffness, nonlinearity, and anisotropy. We then develop a system for approximating these mechanical responses with yarn-level cloth simulation, using homogenized\r\nshell models to speed up computation and adding some small-but-necessary extensions to\r\nyarn-level models used in computer graphics.\r\n","lang":"eng"}],"oa_version":"Published Version","alternative_title":["ISTA Thesis"],"month":"09","publication_identifier":{"issn":["2663-337X"],"isbn":["978-3-99078-020-6"]},"publication_status":"published","degree_awarded":"PhD","file":[{"file_name":"thesis_gsperl.pdf","date_created":"2023-01-25T12:04:41Z","title":"Thesis","creator":"cchlebak","file_size":104497530,"date_updated":"2023-02-02T09:29:57Z","file_id":"12371","checksum":"083722acbb8115e52e3b0fdec6226769","relation":"main_file","access_level":"open_access","content_type":"application/pdf","description":"This is the main PDF file of the thesis. File size: 105 MB"},{"checksum":"511f82025e5fcb70bff4731d6896ca07","file_id":"12483","description":"This version of the thesis uses stronger image compression for a smaller file size of 23MB.","content_type":"application/pdf","relation":"main_file","access_level":"open_access","file_name":"thesis_gsperl_compressed.pdf","date_created":"2023-02-02T09:33:37Z","title":"Thesis (compressed 23MB)","file_size":23183710,"date_updated":"2023-02-02T09:33:37Z","creator":"cchlebak"},{"content_type":"application/x-zip-compressed","access_level":"open_access","relation":"source_file","checksum":"ed4cb85225eedff761c25bddfc37a2ed","file_id":"12484","date_updated":"2023-02-02T09:39:25Z","file_size":98382247,"creator":"cchlebak","date_created":"2023-02-02T09:39:25Z","file_name":"thesis-source.zip"}],"language":[{"iso":"eng"}],"related_material":{"record":[{"relation":"part_of_dissertation","status":"public","id":"11736"},{"relation":"part_of_dissertation","id":"9818","status":"public"},{"id":"8385","status":"public","relation":"part_of_dissertation"}]},"ec_funded":1,"_id":"12358","type":"dissertation","status":"public","supervisor":[{"last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"date_updated":"2024-02-28T12:57:46Z","ddc":["000","620"],"department":[{"_id":"GradSch"},{"_id":"ChWo"}],"file_date_updated":"2023-02-02T09:39:25Z"},{"_id":"9818","article_type":"original","type":"journal_article","status":"public","date_updated":"2023-08-10T14:24:36Z","department":[{"_id":"GradSch"},{"_id":"ChWo"}],"acknowledged_ssus":[{"_id":"ScienComp"}],"abstract":[{"text":"Triangle mesh-based simulations are able to produce satisfying animations of knitted and woven cloth; however, they lack the rich geometric detail of yarn-level simulations. Naive texturing approaches do not consider yarn-level physics, while full yarn-level simulations may become prohibitively expensive for large garments. We propose a method to animate yarn-level cloth geometry on top of an underlying deforming mesh in a mechanics-aware fashion. Using triangle strains to interpolate precomputed yarn geometry, we are able to reproduce effects such as knit loops tightening under stretching. In combination with precomputed mesh animation or real-time mesh simulation, our method is able to animate yarn-level cloth in real-time at large scales.","lang":"eng"}],"oa_version":"Published Version","scopus_import":"1","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1145/3450626.3459816"}],"month":"08","intvolume":" 40","publication_identifier":{"eissn":["15577368"],"issn":["07300301"]},"publication_status":"published","language":[{"iso":"eng"}],"related_material":{"record":[{"relation":"dissertation_contains","id":"12358","status":"public"},{"relation":"software","id":"9327","status":"public"}],"link":[{"description":"News on IST Webpage","url":"https://ist.ac.at/en/news/knitting-virtual-yarn/","relation":"press_release"}]},"issue":"4","volume":40,"ec_funded":1,"article_number":"168","project":[{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425"}],"citation":{"ieee":"G. Sperl, R. Narain, and C. Wojtan, “Mechanics-aware deformation of yarn pattern geometry,” ACM Transactions on Graphics, vol. 40, no. 4. Association for Computing Machinery, 2021.","short":"G. Sperl, R. Narain, C. Wojtan, ACM Transactions on Graphics 40 (2021).","ama":"Sperl G, Narain R, Wojtan C. Mechanics-aware deformation of yarn pattern geometry. ACM Transactions on Graphics. 2021;40(4). doi:10.1145/3450626.3459816","apa":"Sperl, G., Narain, R., & Wojtan, C. (2021). Mechanics-aware deformation of yarn pattern geometry. ACM Transactions on Graphics. Association for Computing Machinery. https://doi.org/10.1145/3450626.3459816","mla":"Sperl, Georg, et al. “Mechanics-Aware Deformation of Yarn Pattern Geometry.” ACM Transactions on Graphics, vol. 40, no. 4, 168, Association for Computing Machinery, 2021, doi:10.1145/3450626.3459816.","ista":"Sperl G, Narain R, Wojtan C. 2021. Mechanics-aware deformation of yarn pattern geometry. ACM Transactions on Graphics. 40(4), 168.","chicago":"Sperl, Georg, Rahul Narain, and Chris Wojtan. “Mechanics-Aware Deformation of Yarn Pattern Geometry.” ACM Transactions on Graphics. Association for Computing Machinery, 2021. https://doi.org/10.1145/3450626.3459816."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","author":[{"last_name":"Sperl","full_name":"Sperl, Georg","first_name":"Georg","id":"4DD40360-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Narain, Rahul","last_name":"Narain","first_name":"Rahul"},{"orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"external_id":{"isi":["000674930900132"]},"article_processing_charge":"Yes (in subscription journal)","title":"Mechanics-aware deformation of yarn pattern geometry","acknowledgement":"We wish to thank the anonymous reviewers and the members of the Visual Computing Group at IST Austria for their valuable feedback. We also thank Seddi Labs for providing the garment model with fold-over seams.\r\nThis research was supported by the Scientific Service Units (SSU) of IST Austria through resources provided by Scientific\r\nComputing. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 638176. Rahul Narain is supported by a Pankaj Gupta Young Faculty Fellowship and a gift from Adobe Inc.","publisher":"Association for Computing Machinery","quality_controlled":"1","oa":1,"isi":1,"year":"2021","day":"01","publication":"ACM Transactions on Graphics","doi":"10.1145/3450626.3459816","date_published":"2021-08-01T00:00:00Z","date_created":"2021-08-08T22:01:27Z"},{"file":[{"access_level":"open_access","relation":"main_file","content_type":"application/zip","file_id":"9328","checksum":"0324cb519273371708743f3282e7c081","success":1,"creator":"gsperl","date_updated":"2021-04-16T14:15:12Z","file_size":802586232,"date_created":"2021-04-16T14:15:12Z","file_name":"MADYPG_extra_data.zip"},{"checksum":"4c224551adf852b136ec21a4e13f0c1b","file_id":"9353","content_type":"application/gzip","relation":"main_file","access_level":"open_access","file_name":"MADYPG.zip","date_created":"2021-04-26T09:33:44Z","file_size":64962865,"date_updated":"2021-04-26T09:33:44Z","creator":"pub-gitlab-bot"}],"year":"2021","has_accepted_license":"1","date_created":"2021-04-16T14:26:19Z","license":"https://opensource.org/licenses/MIT","doi":"10.15479/AT:ISTA:9327","related_material":{"record":[{"status":"public","id":"9818","relation":"used_for_analysis_in"}]},"date_published":"2021-05-01T00:00:00Z","gitlab_commit_id":"6a77e7e22769230ae5f5edaa090fb4b828e57573","gitlab_url":"https://git.ist.ac.at/gsperl/MADYPG","abstract":[{"lang":"eng","text":"This archive contains the missing sweater mesh animations and displacement models for the code of \"Mechanics-Aware Deformation of Yarn Pattern Geometry\"\r\n\r\nCode Repository: https://git.ist.ac.at/gsperl/MADYPG"}],"month":"05","oa":1,"publisher":"IST Austria","ddc":["005"],"user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","citation":{"ista":"Sperl G, Narain R, Wojtan C. 2021. Mechanics-Aware Deformation of Yarn Pattern Geometry (Additional Animation/Model Data), IST Austria, 10.15479/AT:ISTA:9327.","chicago":"Sperl, Georg, Rahul Narain, and Chris Wojtan. “Mechanics-Aware Deformation of Yarn Pattern Geometry (Additional Animation/Model Data).” IST Austria, 2021. https://doi.org/10.15479/AT:ISTA:9327.","ama":"Sperl G, Narain R, Wojtan C. Mechanics-Aware Deformation of Yarn Pattern Geometry (Additional Animation/Model Data). 2021. doi:10.15479/AT:ISTA:9327","apa":"Sperl, G., Narain, R., & Wojtan, C. (2021). Mechanics-Aware Deformation of Yarn Pattern Geometry (Additional Animation/Model Data). IST Austria. https://doi.org/10.15479/AT:ISTA:9327","ieee":"G. Sperl, R. Narain, and C. Wojtan, “Mechanics-Aware Deformation of Yarn Pattern Geometry (Additional Animation/Model Data).” IST Austria, 2021.","short":"G. Sperl, R. Narain, C. Wojtan, (2021).","mla":"Sperl, Georg, et al. Mechanics-Aware Deformation of Yarn Pattern Geometry (Additional Animation/Model Data). IST Austria, 2021, doi:10.15479/AT:ISTA:9327."},"date_updated":"2023-08-10T14:24:36Z","file_date_updated":"2021-04-26T09:33:44Z","title":"Mechanics-Aware Deformation of Yarn Pattern Geometry (Additional Animation/Model Data)","department":[{"_id":"GradSch"},{"_id":"ChWo"}],"author":[{"first_name":"Georg","id":"4DD40360-F248-11E8-B48F-1D18A9856A87","last_name":"Sperl","full_name":"Sperl, Georg"},{"last_name":"Narain","full_name":"Narain, Rahul","first_name":"Rahul"},{"orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"_id":"9327","status":"public","tmp":{"short":"MIT","name":"The MIT License","legal_code_url":"https://opensource.org/licenses/MIT"},"type":"software"},{"isi":1,"has_accepted_license":"1","year":"2020","day":"08","publication":"ACM Transactions on Graphics","doi":"10.1145/3386569.3392466","date_published":"2020-07-08T00:00:00Z","date_created":"2020-09-20T22:01:37Z","acknowledgement":"We wish to thank the anonymous reviewers and the members of the Visual Computing Group at IST Austria for their valuable feedback. This research was supported by the Scientific Service Units (SSU) of IST Austria through resources provided by Scientific Computing. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 638176 and Marie SkłodowskaCurie Grant Agreement No. 665385.","quality_controlled":"1","publisher":"Association for Computing Machinery","oa":1,"citation":{"mla":"Skrivan, Tomas, et al. “Wave Curves: Simulating Lagrangian Water Waves on Dynamically Deforming Surfaces.” ACM Transactions on Graphics, vol. 39, no. 4, 65, Association for Computing Machinery, 2020, doi:10.1145/3386569.3392466.","short":"T. Skrivan, A. Soderstrom, J. Johansson, C. Sprenger, K. Museth, C. Wojtan, ACM Transactions on Graphics 39 (2020).","ieee":"T. Skrivan, A. Soderstrom, J. Johansson, C. Sprenger, K. Museth, and C. Wojtan, “Wave curves: Simulating Lagrangian water waves on dynamically deforming surfaces,” ACM Transactions on Graphics, vol. 39, no. 4. Association for Computing Machinery, 2020.","ama":"Skrivan T, Soderstrom A, Johansson J, Sprenger C, Museth K, Wojtan C. Wave curves: Simulating Lagrangian water waves on dynamically deforming surfaces. ACM Transactions on Graphics. 2020;39(4). doi:10.1145/3386569.3392466","apa":"Skrivan, T., Soderstrom, A., Johansson, J., Sprenger, C., Museth, K., & Wojtan, C. (2020). Wave curves: Simulating Lagrangian water waves on dynamically deforming surfaces. ACM Transactions on Graphics. Association for Computing Machinery. https://doi.org/10.1145/3386569.3392466","chicago":"Skrivan, Tomas, Andreas Soderstrom, John Johansson, Christoph Sprenger, Ken Museth, and Chris Wojtan. “Wave Curves: Simulating Lagrangian Water Waves on Dynamically Deforming Surfaces.” ACM Transactions on Graphics. Association for Computing Machinery, 2020. https://doi.org/10.1145/3386569.3392466.","ista":"Skrivan T, Soderstrom A, Johansson J, Sprenger C, Museth K, Wojtan C. 2020. Wave curves: Simulating Lagrangian water waves on dynamically deforming surfaces. ACM Transactions on Graphics. 39(4), 65."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","author":[{"full_name":"Skrivan, Tomas","last_name":"Skrivan","first_name":"Tomas","id":"486A5A46-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Soderstrom, Andreas","last_name":"Soderstrom","first_name":"Andreas"},{"first_name":"John","full_name":"Johansson, John","last_name":"Johansson"},{"first_name":"Christoph","last_name":"Sprenger","full_name":"Sprenger, Christoph"},{"last_name":"Museth","full_name":"Museth, Ken","first_name":"Ken"},{"orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"external_id":{"isi":["000583700300038"]},"article_processing_charge":"No","title":"Wave curves: Simulating Lagrangian water waves on dynamically deforming surfaces","article_number":"65","project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"},{"_id":"2564DBCA-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"665385","name":"International IST Doctoral Program"}],"publication_identifier":{"eissn":["15577368"],"issn":["07300301"]},"publication_status":"published","file":[{"date_created":"2020-09-21T07:51:44Z","file_name":"2020_ACM_Skrivan.pdf","creator":"dernst","date_updated":"2020-09-21T07:51:44Z","file_size":20223953,"checksum":"c3a680893f01cc4a9e961ff0a4cfa12f","file_id":"8541","success":1,"access_level":"open_access","relation":"main_file","content_type":"application/pdf"}],"language":[{"iso":"eng"}],"volume":39,"issue":"4","ec_funded":1,"acknowledged_ssus":[{"_id":"ScienComp"}],"abstract":[{"text":"We propose a method to enhance the visual detail of a water surface simulation. Our method works as a post-processing step which takes a simulation as input and increases its apparent resolution by simulating many detailed Lagrangian water waves on top of it. We extend linear water wave theory to work in non-planar domains which deform over time, and we discretize the theory using Lagrangian wave packets attached to spline curves. The method is numerically stable and trivially parallelizable, and it produces high frequency ripples with dispersive wave-like behaviors customized to the underlying fluid simulation.","lang":"eng"}],"oa_version":"Published Version","scopus_import":"1","month":"07","intvolume":" 39","date_updated":"2023-08-22T09:28:27Z","ddc":["000"],"department":[{"_id":"ChWo"}],"file_date_updated":"2020-09-21T07:51:44Z","_id":"8535","article_type":"original","type":"journal_article","status":"public"},{"status":"public","keyword":["Computer Networks and Communications"],"article_type":"original","type":"journal_article","_id":"8765","department":[{"_id":"ChWo"}],"file_date_updated":"2020-11-23T09:05:13Z","ddc":["000"],"date_updated":"2023-09-05T16:00:13Z","month":"05","intvolume":" 39","scopus_import":"1","oa_version":"Submitted Version","acknowledged_ssus":[{"_id":"ScienComp"}],"abstract":[{"text":"This paper introduces a simple method for simulating highly anisotropic elastoplastic material behaviors like the dissolution of fibrous phenomena (splintering wood, shredding bales of hay) and materials composed of large numbers of irregularly‐shaped bodies (piles of twigs, pencils, or cards). We introduce a simple transformation of the anisotropic problem into an equivalent isotropic one, and we solve this new “fictitious” isotropic problem using an existing simulator based on the material point method. Our approach results in minimal changes to existing simulators, and it allows us to re‐use popular isotropic plasticity models like the Drucker‐Prager yield criterion instead of inventing new anisotropic plasticity models for every phenomenon we wish to simulate.","lang":"eng"}],"issue":"2","volume":39,"ec_funded":1,"file":[{"creator":"dernst","file_size":38969122,"date_updated":"2020-11-23T09:05:13Z","file_name":"2020_poff_revisited.pdf","date_created":"2020-11-23T09:05:13Z","relation":"main_file","access_level":"open_access","content_type":"application/pdf","success":1,"checksum":"7605f605acd84d0942b48bc7a1c2d72e","file_id":"8796"}],"language":[{"iso":"eng"}],"publication_identifier":{"issn":["0167-7055"],"eissn":["1467-8659"]},"publication_status":"published","project":[{"_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"}],"title":"A practical method for animating anisotropic elastoplastic materials","author":[{"id":"2B14B676-F248-11E8-B48F-1D18A9856A87","first_name":"Camille","full_name":"Schreck, Camille","last_name":"Schreck"},{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546"}],"article_processing_charge":"No","external_id":{"isi":["000548709600008"]},"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","citation":{"short":"C. Schreck, C. Wojtan, Computer Graphics Forum 39 (2020) 89–99.","ieee":"C. Schreck and C. Wojtan, “A practical method for animating anisotropic elastoplastic materials,” Computer Graphics Forum, vol. 39, no. 2. Wiley, pp. 89–99, 2020.","apa":"Schreck, C., & Wojtan, C. (2020). A practical method for animating anisotropic elastoplastic materials. Computer Graphics Forum. Wiley. https://doi.org/10.1111/cgf.13914","ama":"Schreck C, Wojtan C. A practical method for animating anisotropic elastoplastic materials. Computer Graphics Forum. 2020;39(2):89-99. doi:10.1111/cgf.13914","mla":"Schreck, Camille, and Chris Wojtan. “A Practical Method for Animating Anisotropic Elastoplastic Materials.” Computer Graphics Forum, vol. 39, no. 2, Wiley, 2020, pp. 89–99, doi:10.1111/cgf.13914.","ista":"Schreck C, Wojtan C. 2020. A practical method for animating anisotropic elastoplastic materials. Computer Graphics Forum. 39(2), 89–99.","chicago":"Schreck, Camille, and Chris Wojtan. “A Practical Method for Animating Anisotropic Elastoplastic Materials.” Computer Graphics Forum. Wiley, 2020. https://doi.org/10.1111/cgf.13914."},"publisher":"Wiley","quality_controlled":"1","oa":1,"acknowledgement":"We wish to thank the anonymous reviewers and the members of the Visual Computing Group at IST Austria for their valuable feedback. This research was supported by the Scientific Service Units (SSU) of IST Austria through resources provided by Scientific Computing. We would also like to thank Joseph Teran and Chenfanfu Jiang for the helpful discussions.\r\nThis project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme under grant agreement No. 638176.","date_published":"2020-05-01T00:00:00Z","doi":"10.1111/cgf.13914","date_created":"2020-11-17T09:35:10Z","page":"89-99","day":"01","publication":"Computer Graphics Forum","isi":1,"has_accepted_license":"1","year":"2020"},{"author":[{"first_name":"Ibayashi","full_name":"Hikaru, Ibayashi","last_name":"Hikaru"},{"orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"},{"full_name":"Thuerey, Nils","last_name":"Thuerey","first_name":"Nils"},{"first_name":"Takeo","last_name":"Igarashi","full_name":"Igarashi, Takeo"},{"last_name":"Ando","full_name":"Ando, Ryoichi","first_name":"Ryoichi"}],"external_id":{"pmid":["30507534"],"isi":["000532295600014"]},"article_processing_charge":"No","title":"Simulating liquids on dynamically warping grids","citation":{"mla":"Hikaru, Ibayashi, et al. “Simulating Liquids on Dynamically Warping Grids.” IEEE Transactions on Visualization and Computer Graphics, vol. 26, no. 6, IEEE, 2020, pp. 2288–302, doi:10.1109/TVCG.2018.2883628.","apa":"Hikaru, I., Wojtan, C., Thuerey, N., Igarashi, T., & Ando, R. (2020). Simulating liquids on dynamically warping grids. IEEE Transactions on Visualization and Computer Graphics. IEEE. https://doi.org/10.1109/TVCG.2018.2883628","ama":"Hikaru I, Wojtan C, Thuerey N, Igarashi T, Ando R. Simulating liquids on dynamically warping grids. IEEE Transactions on Visualization and Computer Graphics. 2020;26(6):2288-2302. doi:10.1109/TVCG.2018.2883628","ieee":"I. Hikaru, C. Wojtan, N. Thuerey, T. Igarashi, and R. Ando, “Simulating liquids on dynamically warping grids,” IEEE Transactions on Visualization and Computer Graphics, vol. 26, no. 6. IEEE, pp. 2288–2302, 2020.","short":"I. Hikaru, C. Wojtan, N. Thuerey, T. Igarashi, R. Ando, IEEE Transactions on Visualization and Computer Graphics 26 (2020) 2288–2302.","chicago":"Hikaru, Ibayashi, Chris Wojtan, Nils Thuerey, Takeo Igarashi, and Ryoichi Ando. “Simulating Liquids on Dynamically Warping Grids.” IEEE Transactions on Visualization and Computer Graphics. IEEE, 2020. https://doi.org/10.1109/TVCG.2018.2883628.","ista":"Hikaru I, Wojtan C, Thuerey N, Igarashi T, Ando R. 2020. Simulating liquids on dynamically warping grids. IEEE Transactions on Visualization and Computer Graphics. 26(6), 2288–2302."},"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","quality_controlled":"1","publisher":"IEEE","oa":1,"acknowledgement":"This work was partially supported by JSPS Grant-in-Aid forYoung Scientists (Start-up) 16H07410, the ERC StartingGrantsrealFlow(StG-2015-637014) andBigSplash(StG-2014-638176). This research was supported by the Scientific Ser-vice Units (SSU) of IST Austria through resources providedby Scientific Computing. We would like to express my grati-tude to Nobuyuki Umetani and Tomas Skrivan for insight-ful discussion.","page":"2288-2302","date_published":"2020-06-01T00:00:00Z","doi":"10.1109/TVCG.2018.2883628","date_created":"2018-12-16T22:59:21Z","has_accepted_license":"1","isi":1,"year":"2020","day":"01","publication":"IEEE Transactions on Visualization and Computer Graphics","type":"journal_article","article_type":"original","status":"public","_id":"5681","file_date_updated":"2020-10-08T08:34:53Z","department":[{"_id":"ChWo"}],"date_updated":"2023-09-18T09:30:01Z","ddc":["006"],"scopus_import":"1","month":"06","intvolume":" 26","acknowledged_ssus":[{"_id":"ScienComp"}],"abstract":[{"lang":"eng","text":"We introduce dynamically warping grids for adaptive liquid simulation. Our primary contributions are a strategy for dynamically deforming regular grids over the course of a simulation and a method for efficiently utilizing these deforming grids for liquid simulation. Prior work has shown that unstructured grids are very effective for adaptive fluid simulations. However, unstructured grids often lead to complicated implementations and a poor cache hit rate due to inconsistent memory access. Regular grids, on the other hand, provide a fast, fixed memory access pattern and straightforward implementation. Our method combines the advantages of both: we leverage the simplicity of regular grids while still achieving practical and controllable spatial adaptivity. We demonstrate that our method enables adaptive simulations that are fast, flexible, and robust to null-space issues. At the same time, our method is simple to implement and takes advantage of existing highly-tuned algorithms."}],"oa_version":"Submitted Version","pmid":1,"issue":"6","volume":26,"publication_identifier":{"eissn":["19410506"],"issn":["10772626"]},"publication_status":"published","file":[{"creator":"wojtan","file_size":21910098,"date_updated":"2020-10-08T08:34:53Z","file_name":"preprint.pdf","date_created":"2020-10-08T08:34:53Z","relation":"main_file","access_level":"open_access","content_type":"application/pdf","success":1,"file_id":"8626","checksum":"8d4c55443a0ee335bb5bb652de503042"}],"language":[{"iso":"eng"}]},{"project":[{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"article_number":"31","author":[{"first_name":"Sadashige","id":"6F7C4B96-A8E9-11E9-A7CA-09ECE5697425","last_name":"Ishida","full_name":"Ishida, Sadashige"},{"first_name":"Peter","id":"331776E2-F248-11E8-B48F-1D18A9856A87","last_name":"Synak","full_name":"Synak, Peter"},{"full_name":"Narita, Fumiya","last_name":"Narita","first_name":"Fumiya"},{"first_name":"Toshiya","last_name":"Hachisuka","full_name":"Hachisuka, Toshiya"},{"first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan"}],"external_id":{"isi":["000583700300004"]},"article_processing_charge":"No","title":"A model for soap film dynamics with evolving thickness","citation":{"chicago":"Ishida, Sadashige, Peter Synak, Fumiya Narita, Toshiya Hachisuka, and Chris Wojtan. “A Model for Soap Film Dynamics with Evolving Thickness.” ACM Transactions on Graphics. Association for Computing Machinery, 2020. https://doi.org/10.1145/3386569.3392405.","ista":"Ishida S, Synak P, Narita F, Hachisuka T, Wojtan C. 2020. A model for soap film dynamics with evolving thickness. ACM Transactions on Graphics. 39(4), 31.","mla":"Ishida, Sadashige, et al. “A Model for Soap Film Dynamics with Evolving Thickness.” ACM Transactions on Graphics, vol. 39, no. 4, 31, Association for Computing Machinery, 2020, doi:10.1145/3386569.3392405.","apa":"Ishida, S., Synak, P., Narita, F., Hachisuka, T., & Wojtan, C. (2020). A model for soap film dynamics with evolving thickness. ACM Transactions on Graphics. Association for Computing Machinery. https://doi.org/10.1145/3386569.3392405","ama":"Ishida S, Synak P, Narita F, Hachisuka T, Wojtan C. A model for soap film dynamics with evolving thickness. ACM Transactions on Graphics. 2020;39(4). doi:10.1145/3386569.3392405","ieee":"S. Ishida, P. Synak, F. Narita, T. Hachisuka, and C. Wojtan, “A model for soap film dynamics with evolving thickness,” ACM Transactions on Graphics, vol. 39, no. 4. Association for Computing Machinery, 2020.","short":"S. Ishida, P. Synak, F. Narita, T. Hachisuka, C. Wojtan, ACM Transactions on Graphics 39 (2020)."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Association for Computing Machinery","quality_controlled":"1","oa":1,"acknowledgement":"We wish to thank the anonymous reviewers and the members of the Visual Computing Group at IST Austria for their valuable feedback, especially Camille Schreck for her help in rendering. This research was supported by the Scientific Service Units (SSU) of IST Austria through resources provided by Scientific Computing. We would like to thank the authors of [Belcour and Barla 2017] for providing their implementation, the authors of [Atkins and Elliott 2010] and [Seychelles et al. 2008] for allowing us to use their results, and Rok Grah for helpful discussions. Finally, we thank Ryoichi Ando for many discussions from the beginning of the project that resulted in important contents of the paper including our formulation, numerical scheme, and initial implementation. This project has received funding from the\r\nEuropean Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 638176.","doi":"10.1145/3386569.3392405","date_published":"2020-07-08T00:00:00Z","date_created":"2020-09-13T22:01:18Z","has_accepted_license":"1","isi":1,"year":"2020","day":"08","publication":"ACM Transactions on Graphics","type":"journal_article","article_type":"original","status":"public","_id":"8384","file_date_updated":"2020-11-23T09:03:19Z","department":[{"_id":"ChWo"}],"date_updated":"2024-02-28T12:57:31Z","ddc":["000"],"scopus_import":"1","main_file_link":[{"url":"https://doi.org/10.1145/3386569.3392405","open_access":"1"}],"month":"07","intvolume":" 39","acknowledged_ssus":[{"_id":"ScienComp"}],"abstract":[{"lang":"eng","text":"Previous research on animations of soap bubbles, films, and foams largely focuses on the motion and geometric shape of the bubble surface. These works neglect the evolution of the bubble’s thickness, which is normally responsible for visual phenomena like surface vortices, Newton’s interference patterns, capillary waves, and deformation-dependent rupturing of films in a foam. In this paper, we model these natural phenomena by introducing the film thickness as a reduced degree of freedom in the Navier-Stokes equations and deriving their equations of motion. We discretize the equations on a nonmanifold triangle mesh surface and couple it to an existing bubble solver. In doing so, we also introduce an incompressible fluid solver for 2.5D films and a novel advection algorithm for convecting fields across non-manifold surface junctions. Our simulations enhance state-of-the-art bubble solvers with additional effects caused by convection, rippling, draining, and evaporation of the thin film."}],"oa_version":"Submitted Version","volume":39,"issue":"4","ec_funded":1,"publication_identifier":{"issn":["07300301"],"eissn":["15577368"]},"publication_status":"published","file":[{"file_id":"8795","checksum":"813831ca91319d794d9748c276b24578","success":1,"access_level":"open_access","relation":"main_file","content_type":"application/pdf","date_created":"2020-11-23T09:03:19Z","file_name":"2020_soapfilm_submitted.pdf","creator":"dernst","date_updated":"2020-11-23T09:03:19Z","file_size":14935529}],"language":[{"iso":"eng"}]},{"oa":1,"quality_controlled":"1","publisher":"Association for Computing Machinery","acknowledgement":"We wish to thank the anonymous reviewers and the members of the Visual Computing Group at IST Austria for their valuable feedback. We also thank the creators of the Berkeley Garment Library [de Joya et al. 2012] for providing garment meshes, [Krishnamurthy and Levoy 1996] and [Turk and Levoy 1994] for the armadillo and bunny meshes, the creators of libWetCloth [Fei et al. 2018] for their implementation of discrete elastic rod forces, and Tomáš Skřivan for\r\ninspiring discussions and help with Mathematica code generation. This research was supported by the Scientific Service Units (SSU) of IST Austria through resources provided by Scientific Computing. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 638176. Rahul Narain is supported by a Pankaj Gupta Young Faculty Fellowship and a gift from Adobe Inc.","date_created":"2020-09-13T22:01:18Z","doi":"10.1145/3386569.3392412","date_published":"2020-07-08T00:00:00Z","publication":"ACM Transactions on Graphics","day":"08","year":"2020","has_accepted_license":"1","isi":1,"project":[{"call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"}],"article_number":"48","title":"Homogenized yarn-level cloth","article_processing_charge":"No","external_id":{"isi":["000583700300021"]},"author":[{"last_name":"Sperl","full_name":"Sperl, Georg","first_name":"Georg","id":"4DD40360-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Rahul","last_name":"Narain","full_name":"Narain, Rahul"},{"full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"ieee":"G. Sperl, R. Narain, and C. Wojtan, “Homogenized yarn-level cloth,” ACM Transactions on Graphics, vol. 39, no. 4. Association for Computing Machinery, 2020.","short":"G. Sperl, R. Narain, C. Wojtan, ACM Transactions on Graphics 39 (2020).","ama":"Sperl G, Narain R, Wojtan C. Homogenized yarn-level cloth. ACM Transactions on Graphics. 2020;39(4). doi:10.1145/3386569.3392412","apa":"Sperl, G., Narain, R., & Wojtan, C. (2020). Homogenized yarn-level cloth. ACM Transactions on Graphics. Association for Computing Machinery. https://doi.org/10.1145/3386569.3392412","mla":"Sperl, Georg, et al. “Homogenized Yarn-Level Cloth.” ACM Transactions on Graphics, vol. 39, no. 4, 48, Association for Computing Machinery, 2020, doi:10.1145/3386569.3392412.","ista":"Sperl G, Narain R, Wojtan C. 2020. Homogenized yarn-level cloth. ACM Transactions on Graphics. 39(4), 48.","chicago":"Sperl, Georg, Rahul Narain, and Chris Wojtan. “Homogenized Yarn-Level Cloth.” ACM Transactions on Graphics. Association for Computing Machinery, 2020. https://doi.org/10.1145/3386569.3392412."},"intvolume":" 39","month":"07","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1145/3386569.3392412"}],"scopus_import":"1","oa_version":"Submitted Version","acknowledged_ssus":[{"_id":"ScienComp"}],"abstract":[{"text":"We present a method for animating yarn-level cloth effects using a thin-shell solver. We accomplish this through numerical homogenization: we first use a large number of yarn-level simulations to build a model of the potential energy density of the cloth, and then use this energy density function to compute forces in a thin shell simulator. We model several yarn-based materials, including both woven and knitted fabrics. Our model faithfully reproduces expected effects like the stiffness of woven fabrics, and the highly deformable nature and anisotropy of knitted fabrics. Our approach does not require any real-world experiments nor measurements; because the method is based entirely on simulations, it can generate entirely new material models quickly, without the need for testing apparatuses or human intervention. We provide data-driven models of several woven and knitted fabrics, which can be used for efficient simulation with an off-the-shelf cloth solver.","lang":"eng"}],"ec_funded":1,"volume":39,"related_material":{"record":[{"status":"public","id":"12358","relation":"dissertation_contains"}]},"issue":"4","language":[{"iso":"eng"}],"file":[{"file_size":38922662,"date_updated":"2020-11-23T09:01:22Z","creator":"dernst","file_name":"2020_hylc_submitted.pdf","date_created":"2020-11-23T09:01:22Z","content_type":"application/pdf","relation":"main_file","access_level":"open_access","success":1,"file_id":"8794","checksum":"cf4c1d361c3196c4bd424520a5588205"}],"publication_status":"published","publication_identifier":{"issn":["07300301"],"eissn":["15577368"]},"status":"public","type":"journal_article","article_type":"original","_id":"8385","department":[{"_id":"ChWo"}],"file_date_updated":"2020-11-23T09:01:22Z","ddc":["000"],"date_updated":"2024-02-28T12:57:47Z"},{"date_created":"2020-11-17T10:47:48Z","doi":"10.1111/cgf.14100","date_published":"2020-12-01T00:00:00Z","page":"47-54","publication":"Computer Graphics forum","day":"01","year":"2020","isi":1,"quality_controlled":"1","publisher":"Wiley","title":"Making procedural water waves boundary-aware","external_id":{"isi":["000591780400005"]},"article_processing_charge":"No","author":[{"first_name":"Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87","last_name":"Jeschke","full_name":"Jeschke, Stefan"},{"full_name":"Hafner, Christian","last_name":"Hafner","first_name":"Christian","id":"400429CC-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Chentanez, Nuttapong","last_name":"Chentanez","first_name":"Nuttapong"},{"last_name":"Macklin","full_name":"Macklin, Miles","first_name":"Miles"},{"first_name":"Matthias","last_name":"Müller-Fischer","full_name":"Müller-Fischer, Matthias"},{"last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"user_id":"2EBD1598-F248-11E8-B48F-1D18A9856A87","citation":{"chicago":"Jeschke, Stefan, Christian Hafner, Nuttapong Chentanez, Miles Macklin, Matthias Müller-Fischer, and Chris Wojtan. “Making Procedural Water Waves Boundary-Aware.” Computer Graphics Forum. Wiley, 2020. https://doi.org/10.1111/cgf.14100.","ista":"Jeschke S, Hafner C, Chentanez N, Macklin M, Müller-Fischer M, Wojtan C. 2020. Making procedural water waves boundary-aware. Computer Graphics forum. 39(8), 47–54.","mla":"Jeschke, Stefan, et al. “Making Procedural Water Waves Boundary-Aware.” Computer Graphics Forum, vol. 39, no. 8, Wiley, 2020, pp. 47–54, doi:10.1111/cgf.14100.","short":"S. Jeschke, C. Hafner, N. Chentanez, M. Macklin, M. Müller-Fischer, C. Wojtan, Computer Graphics Forum 39 (2020) 47–54.","ieee":"S. Jeschke, C. Hafner, N. Chentanez, M. Macklin, M. Müller-Fischer, and C. Wojtan, “Making procedural water waves boundary-aware,” Computer Graphics forum, vol. 39, no. 8. Wiley, pp. 47–54, 2020.","ama":"Jeschke S, Hafner C, Chentanez N, Macklin M, Müller-Fischer M, Wojtan C. Making procedural water waves boundary-aware. Computer Graphics forum. 2020;39(8):47-54. doi:10.1111/cgf.14100","apa":"Jeschke, S., Hafner, C., Chentanez, N., Macklin, M., Müller-Fischer, M., & Wojtan, C. (2020). Making procedural water waves boundary-aware. Computer Graphics Forum. Online Symposium: Wiley. https://doi.org/10.1111/cgf.14100"},"project":[{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425"},{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","grant_number":"715767","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"ec_funded":1,"issue":"8","volume":39,"language":[{"iso":"eng"}],"publication_status":"published","intvolume":" 39","month":"12","scopus_import":"1","oa_version":"None","abstract":[{"lang":"eng","text":"The “procedural” approach to animating ocean waves is the dominant algorithm for animating larger bodies of water in\r\ninteractive applications as well as in off-line productions — it provides high visual quality with a low computational demand. In this paper, we widen the applicability of procedural water wave animation with an extension that guarantees the satisfaction of boundary conditions imposed by terrain while still approximating physical wave behavior. In combination with a particle system that models wave breaking, foam, and spray, this allows us to naturally model waves interacting with beaches and rocks. Our system is able to animate waves at large scales at interactive frame rates on a commodity PC."}],"department":[{"_id":"ChWo"},{"_id":"BeBi"}],"date_updated":"2024-02-28T13:58:11Z","status":"public","conference":{"start_date":"2020-10-06","end_date":"2020-10-09","location":"Online Symposium","name":"SCA: Symposium on Computer Animation"},"type":"journal_article","article_type":"original","_id":"8766"},{"date_published":"2019-07-01T00:00:00Z","doi":"10.1145/3306346.3323002","date_created":"2019-05-14T07:04:06Z","has_accepted_license":"1","isi":1,"year":"2019","day":"01","publication":"ACM Transactions on Graphics","quality_controlled":"1","publisher":"ACM","oa":1,"author":[{"last_name":"Schreck","full_name":"Schreck, Camille","id":"2B14B676-F248-11E8-B48F-1D18A9856A87","first_name":"Camille"},{"first_name":"Christian","id":"400429CC-F248-11E8-B48F-1D18A9856A87","full_name":"Hafner, Christian","last_name":"Hafner"},{"first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J"}],"article_processing_charge":"No","external_id":{"isi":["000475740600104"]},"title":"Fundamental solutions for water wave animation","citation":{"apa":"Schreck, C., Hafner, C., & Wojtan, C. (2019). Fundamental solutions for water wave animation. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/3306346.3323002","ama":"Schreck C, Hafner C, Wojtan C. Fundamental solutions for water wave animation. ACM Transactions on Graphics. 2019;38(4). doi:10.1145/3306346.3323002","ieee":"C. Schreck, C. Hafner, and C. Wojtan, “Fundamental solutions for water wave animation,” ACM Transactions on Graphics, vol. 38, no. 4. ACM, 2019.","short":"C. Schreck, C. Hafner, C. Wojtan, ACM Transactions on Graphics 38 (2019).","mla":"Schreck, Camille, et al. “Fundamental Solutions for Water Wave Animation.” ACM Transactions on Graphics, vol. 38, no. 4, 130, ACM, 2019, doi:10.1145/3306346.3323002.","ista":"Schreck C, Hafner C, Wojtan C. 2019. Fundamental solutions for water wave animation. ACM Transactions on Graphics. 38(4), 130.","chicago":"Schreck, Camille, Christian Hafner, and Chris Wojtan. “Fundamental Solutions for Water Wave Animation.” ACM Transactions on Graphics. ACM, 2019. https://doi.org/10.1145/3306346.3323002."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425"},{"_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling"},{"call_identifier":"H2020","_id":"2564DBCA-B435-11E9-9278-68D0E5697425","name":"International IST Doctoral Program","grant_number":"665385"}],"article_number":"130","volume":38,"related_material":{"link":[{"description":"News on IST Homepage","relation":"press_release","url":"https://ist.ac.at/en/news/new-method-makes-realistic-water-wave-animations-more-efficient/"}]},"issue":"4","ec_funded":1,"publication_status":"published","file":[{"access_level":"open_access","relation":"main_file","content_type":"application/pdf","checksum":"1b737dfe3e051aba8f3f4ab1dceda673","file_id":"6443","creator":"dernst","date_updated":"2020-07-14T12:47:30Z","file_size":44328918,"date_created":"2019-05-14T07:03:55Z","file_name":"2019_ACM_Schreck.pdf"}],"language":[{"iso":"eng"}],"scopus_import":"1","month":"07","intvolume":" 38","abstract":[{"lang":"eng","text":"This paper investigates the use of fundamental solutions for animating detailed linear water surface waves. We first propose an analytical solution for efficiently animating circular ripples in closed form. We then show how to adapt the method of fundamental solutions (MFS) to create ambient waves interacting with complex obstacles. Subsequently, we present a novel wavelet-based discretization which outperforms the state of the art MFS approach for simulating time-varying water surface waves with moving obstacles. Our results feature high-resolution spatial details, interactions with complex boundaries, and large open ocean domains. Our method compares favorably with previous work as well as known analytical solutions. We also present comparisons between our method and real world examples."}],"acknowledged_ssus":[{"_id":"ScienComp"}],"oa_version":"Submitted Version","file_date_updated":"2020-07-14T12:47:30Z","department":[{"_id":"ChWo"}],"date_updated":"2023-08-25T10:18:46Z","ddc":["000","005"],"type":"journal_article","status":"public","_id":"6442"},{"date_created":"2019-11-12T13:05:40Z","doi":"10.1145/3306346.3323009","date_published":"2019-07-01T00:00:00Z","publication":"ACM Transactions on Graphics","day":"01","year":"2019","isi":1,"quality_controlled":"1","publisher":"ACM","title":"Optimal multiple importance sampling","article_processing_charge":"No","external_id":{"isi":["000475740600011"]},"author":[{"first_name":"Ivo","full_name":"Kondapaneni, Ivo","last_name":"Kondapaneni"},{"first_name":"Petr","last_name":"Vevoda","full_name":"Vevoda, Petr"},{"last_name":"Grittmann","full_name":"Grittmann, Pascal","first_name":"Pascal"},{"last_name":"Skrivan","full_name":"Skrivan, Tomas","id":"486A5A46-F248-11E8-B48F-1D18A9856A87","first_name":"Tomas"},{"last_name":"Slusallek","full_name":"Slusallek, Philipp","first_name":"Philipp"},{"last_name":"Křivánek","full_name":"Křivánek, Jaroslav","first_name":"Jaroslav"}],"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","citation":{"ista":"Kondapaneni I, Vevoda P, Grittmann P, Skrivan T, Slusallek P, Křivánek J. 2019. Optimal multiple importance sampling. ACM Transactions on Graphics. 38(4), 37.","chicago":"Kondapaneni, Ivo, Petr Vevoda, Pascal Grittmann, Tomas Skrivan, Philipp Slusallek, and Jaroslav Křivánek. “Optimal Multiple Importance Sampling.” ACM Transactions on Graphics. ACM, 2019. https://doi.org/10.1145/3306346.3323009.","ama":"Kondapaneni I, Vevoda P, Grittmann P, Skrivan T, Slusallek P, Křivánek J. Optimal multiple importance sampling. ACM Transactions on Graphics. 2019;38(4). doi:10.1145/3306346.3323009","apa":"Kondapaneni, I., Vevoda, P., Grittmann, P., Skrivan, T., Slusallek, P., & Křivánek, J. (2019). Optimal multiple importance sampling. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/3306346.3323009","ieee":"I. Kondapaneni, P. Vevoda, P. Grittmann, T. Skrivan, P. Slusallek, and J. Křivánek, “Optimal multiple importance sampling,” ACM Transactions on Graphics, vol. 38, no. 4. ACM, 2019.","short":"I. Kondapaneni, P. Vevoda, P. Grittmann, T. Skrivan, P. Slusallek, J. Křivánek, ACM Transactions on Graphics 38 (2019).","mla":"Kondapaneni, Ivo, et al. “Optimal Multiple Importance Sampling.” ACM Transactions on Graphics, vol. 38, no. 4, 37, ACM, 2019, doi:10.1145/3306346.3323009."},"project":[{"grant_number":"642841","name":"Distributed 3D Object Design","_id":"2508E324-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"article_number":"37","ec_funded":1,"volume":38,"issue":"4","language":[{"iso":"eng"}],"publication_status":"published","publication_identifier":{"issn":["0730-0301"]},"intvolume":" 38","month":"07","scopus_import":"1","oa_version":"None","abstract":[{"lang":"eng","text":"Multiple Importance Sampling (MIS) is a key technique for achieving robustness of Monte Carlo estimators in computer graphics and other fields. We derive optimal weighting functions for MIS that provably minimize the variance of an MIS estimator, given a set of sampling techniques. We show that the resulting variance reduction over the balance heuristic can be higher than predicted by the variance bounds derived by Veach and Guibas, who assumed only non-negative weights in their proof. We theoretically analyze the variance of the optimal MIS weights and show the relation to the variance of the balance heuristic. Furthermore, we establish a connection between the new weighting functions and control variates as previously applied to mixture sampling. We apply the new optimal weights to integration problems in light transport and show that they allow for new design considerations when choosing the appropriate sampling techniques for a given integration problem."}],"department":[{"_id":"ChWo"}],"date_updated":"2023-08-30T07:21:25Z","status":"public","type":"journal_article","article_type":"original","_id":"7002"},{"month":"11","intvolume":" 38","scopus_import":"1","oa_version":"None","abstract":[{"text":"Multiple importance sampling (MIS) has become an indispensable tool in Monte Carlo rendering, widely accepted as a near-optimal solution for combining different sampling techniques. But an MIS combination, using the common balance or power heuristics, often results in an overly defensive estimator, leading to high variance. We show that by generalizing the MIS framework, variance can be substantially reduced. Specifically, we optimize one of the combined sampling techniques so as to decrease the overall variance of the resulting MIS estimator. We apply the approach to the computation of direct illumination due to an HDR environment map and to the computation of global illumination using a path guiding algorithm. The implementation can be as simple as subtracting a constant value from the tabulated sampling density done entirely in a preprocessing step. This produces a consistent noise reduction in all our tests with no negative influence on run time, no artifacts or bias, and no failure cases.","lang":"eng"}],"issue":"6","volume":38,"language":[{"iso":"eng"}],"publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"publication_status":"published","status":"public","article_type":"original","type":"journal_article","_id":"7418","department":[{"_id":"ChWo"}],"date_updated":"2023-09-06T15:22:23Z","quality_controlled":"1","publisher":"ACM","doi":"10.1145/3355089.3356565","date_published":"2019-11-01T00:00:00Z","date_created":"2020-01-30T10:19:43Z","day":"01","publication":"ACM Transactions on Graphics","isi":1,"year":"2019","article_number":"151","title":"MIS compensation: Optimizing sampling techniques in multiple importance sampling","author":[{"full_name":"Karlík, Ondřej","last_name":"Karlík","first_name":"Ondřej"},{"full_name":"Šik, Martin","last_name":"Šik","first_name":"Martin"},{"first_name":"Petr","last_name":"Vévoda","full_name":"Vévoda, Petr"},{"full_name":"Skrivan, Tomas","last_name":"Skrivan","id":"486A5A46-F248-11E8-B48F-1D18A9856A87","first_name":"Tomas"},{"first_name":"Jaroslav","full_name":"Křivánek, Jaroslav","last_name":"Křivánek"}],"external_id":{"isi":["000498397300001"]},"article_processing_charge":"No","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","citation":{"mla":"Karlík, Ondřej, et al. “MIS Compensation: Optimizing Sampling Techniques in Multiple Importance Sampling.” ACM Transactions on Graphics, vol. 38, no. 6, 151, ACM, 2019, doi:10.1145/3355089.3356565.","ieee":"O. Karlík, M. Šik, P. Vévoda, T. Skrivan, and J. Křivánek, “MIS compensation: Optimizing sampling techniques in multiple importance sampling,” ACM Transactions on Graphics, vol. 38, no. 6. ACM, 2019.","short":"O. Karlík, M. Šik, P. Vévoda, T. Skrivan, J. Křivánek, ACM Transactions on Graphics 38 (2019).","apa":"Karlík, O., Šik, M., Vévoda, P., Skrivan, T., & Křivánek, J. (2019). MIS compensation: Optimizing sampling techniques in multiple importance sampling. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/3355089.3356565","ama":"Karlík O, Šik M, Vévoda P, Skrivan T, Křivánek J. MIS compensation: Optimizing sampling techniques in multiple importance sampling. ACM Transactions on Graphics. 2019;38(6). doi:10.1145/3355089.3356565","chicago":"Karlík, Ondřej, Martin Šik, Petr Vévoda, Tomas Skrivan, and Jaroslav Křivánek. “MIS Compensation: Optimizing Sampling Techniques in Multiple Importance Sampling.” ACM Transactions on Graphics. ACM, 2019. https://doi.org/10.1145/3355089.3356565.","ista":"Karlík O, Šik M, Vévoda P, Skrivan T, Křivánek J. 2019. MIS compensation: Optimizing sampling techniques in multiple importance sampling. ACM Transactions on Graphics. 38(6), 151."}},{"department":[{"_id":"ChWo"}],"date_updated":"2024-02-28T13:01:28Z","conference":{"name":"8th International Conference on Novel Trends in Rheology","location":"Zlin, Czech Republic","end_date":"2019-07-31","start_date":"2019-07-30"},"type":"conference","status":"public","_id":"6642","volume":2107,"publication_status":"published","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://arxiv.org/abs/1902.07983","open_access":"1"}],"scopus_import":"1","intvolume":" 2107","month":"05","abstract":[{"lang":"eng","text":"We present a thermodynamically based approach to the design of models for viscoelastic fluids with stress diffusion effect. In particular, we show how to add a stress diffusion term to some standard viscoelastic rate-type models (Giesekus, FENE-P, Johnson–Segalman, Phan-Thien–Tanner and Bautista–Manero–Puig) so that the resulting models with the added stress diffusion term are thermodynamically consistent in the sense that they obey the first and the second law of thermodynamics. We point out the potential applications of the provided thermodynamical background in the study of flows of fluids described by the proposed models."}],"oa_version":"Preprint","article_processing_charge":"No","external_id":{"isi":["000479303100002"],"arxiv":["1902.07983"]},"author":[{"full_name":"Dostalík, Mark","last_name":"Dostalík","first_name":"Mark"},{"full_name":"Pruša, Vít","last_name":"Pruša","first_name":"Vít"},{"last_name":"Skrivan","full_name":"Skrivan, Tomas","first_name":"Tomas","id":"486A5A46-F248-11E8-B48F-1D18A9856A87"}],"title":"On diffusive variants of some classical viscoelastic rate-type models","citation":{"chicago":"Dostalík, Mark, Vít Pruša, and Tomas Skrivan. “On Diffusive Variants of Some Classical Viscoelastic Rate-Type Models.” In AIP Conference Proceedings, Vol. 2107. AIP Publishing, 2019. https://doi.org/10.1063/1.5109493.","ista":"Dostalík M, Pruša V, Skrivan T. 2019. On diffusive variants of some classical viscoelastic rate-type models. AIP Conference Proceedings. 8th International Conference on Novel Trends in Rheology vol. 2107, 020002.","mla":"Dostalík, Mark, et al. “On Diffusive Variants of Some Classical Viscoelastic Rate-Type Models.” AIP Conference Proceedings, vol. 2107, 020002, AIP Publishing, 2019, doi:10.1063/1.5109493.","apa":"Dostalík, M., Pruša, V., & Skrivan, T. (2019). On diffusive variants of some classical viscoelastic rate-type models. In AIP Conference Proceedings (Vol. 2107). Zlin, Czech Republic: AIP Publishing. https://doi.org/10.1063/1.5109493","ama":"Dostalík M, Pruša V, Skrivan T. On diffusive variants of some classical viscoelastic rate-type models. In: AIP Conference Proceedings. Vol 2107. AIP Publishing; 2019. doi:10.1063/1.5109493","short":"M. Dostalík, V. Pruša, T. Skrivan, in:, AIP Conference Proceedings, AIP Publishing, 2019.","ieee":"M. Dostalík, V. Pruša, and T. Skrivan, “On diffusive variants of some classical viscoelastic rate-type models,” in AIP Conference Proceedings, Zlin, Czech Republic, 2019, vol. 2107."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_number":"020002","date_created":"2019-07-15T10:07:09Z","doi":"10.1063/1.5109493","date_published":"2019-05-21T00:00:00Z","year":"2019","isi":1,"publication":"AIP Conference Proceedings","day":"21","oa":1,"quality_controlled":"1","publisher":"AIP Publishing"},{"publication_status":"published","publication_identifier":{"issn":["0167-7055"]},"language":[{"iso":"eng"}],"file":[{"file_size":54309947,"date_updated":"2020-10-08T08:38:23Z","creator":"wojtan","file_name":"exnbflip.pdf","date_created":"2020-10-08T08:38:23Z","content_type":"application/pdf","relation":"main_file","access_level":"open_access","success":1,"checksum":"8edb90da8a72395eb5d970580e0925b6","file_id":"8627"}],"ec_funded":1,"issue":"2","volume":37,"abstract":[{"text":"The Fluid Implicit Particle method (FLIP) reduces numerical dissipation by combining particles with grids. To improve performance, the subsequent narrow band FLIP method (NB‐FLIP) uses a FLIP‐based fluid simulation only near the liquid surface and a traditional grid‐based fluid simulation away from the surface. This spatially‐limited FLIP simulation significantly reduces the number of particles and alleviates a computational bottleneck. In this paper, we extend the NB‐FLIP idea even further, by allowing a simulation to transition between a FLIP‐like fluid simulation and a grid‐based simulation in arbitrary locations, not just near the surface. This approach leads to even more savings in memory and computation, because we can concentrate the particles only in areas where they are needed. More importantly, this new method allows us to seamlessly transition to smooth implicit surface geometry wherever the particle‐based simulation is unnecessary. Consequently, our method leads to a practical algorithm for avoiding the noisy surface artifacts associated with particle‐based liquid simulations, while simultaneously maintaining the benefits of a FLIP simulation in regions of dynamic motion.","lang":"eng"}],"oa_version":"Submitted Version","scopus_import":"1","alternative_title":["Eurographics"],"intvolume":" 37","month":"05","date_updated":"2023-09-11T14:00:26Z","ddc":["006"],"department":[{"_id":"ChWo"}],"file_date_updated":"2020-10-08T08:38:23Z","_id":"135","type":"journal_article","article_type":"original","status":"public","year":"2018","isi":1,"has_accepted_license":"1","publication":"Computer Graphics Forum","day":"22","page":"169 - 177","date_created":"2018-12-11T11:44:49Z","doi":"10.1111/cgf.13351","date_published":"2018-05-22T00:00:00Z","oa":1,"publisher":"Wiley","quality_controlled":"1","citation":{"mla":"Sato, Takahiro, et al. “Extended Narrow Band FLIP for Liquid Simulations.” Computer Graphics Forum, vol. 37, no. 2, Wiley, 2018, pp. 169–77, doi:10.1111/cgf.13351.","short":"T. Sato, C. Wojtan, N. Thuerey, T. Igarashi, R. Ando, Computer Graphics Forum 37 (2018) 169–177.","ieee":"T. Sato, C. Wojtan, N. Thuerey, T. Igarashi, and R. Ando, “Extended narrow band FLIP for liquid simulations,” Computer Graphics Forum, vol. 37, no. 2. Wiley, pp. 169–177, 2018.","ama":"Sato T, Wojtan C, Thuerey N, Igarashi T, Ando R. Extended narrow band FLIP for liquid simulations. Computer Graphics Forum. 2018;37(2):169-177. doi:10.1111/cgf.13351","apa":"Sato, T., Wojtan, C., Thuerey, N., Igarashi, T., & Ando, R. (2018). Extended narrow band FLIP for liquid simulations. Computer Graphics Forum. Wiley. https://doi.org/10.1111/cgf.13351","chicago":"Sato, Takahiro, Chris Wojtan, Nils Thuerey, Takeo Igarashi, and Ryoichi Ando. “Extended Narrow Band FLIP for Liquid Simulations.” Computer Graphics Forum. Wiley, 2018. https://doi.org/10.1111/cgf.13351.","ista":"Sato T, Wojtan C, Thuerey N, Igarashi T, Ando R. 2018. Extended narrow band FLIP for liquid simulations. Computer Graphics Forum. 37(2), 169–177."},"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","external_id":{"isi":["000434085600016"]},"article_processing_charge":"No","author":[{"full_name":"Sato, Takahiro","last_name":"Sato","first_name":"Takahiro"},{"full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"},{"full_name":"Thuerey, Nils","last_name":"Thuerey","first_name":"Nils"},{"last_name":"Igarashi","full_name":"Igarashi, Takeo","first_name":"Takeo"},{"first_name":"Ryoichi","last_name":"Ando","full_name":"Ando, Ryoichi"}],"title":"Extended narrow band FLIP for liquid simulations","project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425"}]},{"month":"07","intvolume":" 37","scopus_import":"1","alternative_title":["SIGGRAPH"],"oa_version":"Published Version","abstract":[{"lang":"eng","text":"The current state of the art in real-time two-dimensional water wave simulation requires developers to choose between efficient Fourier-based methods, which lack interactions with moving obstacles, and finite-difference or finite element methods, which handle environmental interactions but are significantly more expensive. This paper attempts to bridge this long-standing gap between complexity and performance, by proposing a new wave simulation method that can faithfully simulate wave interactions with moving obstacles in real time while simultaneously preserving minute details and accommodating very large simulation domains.\r\n\r\nPrevious methods for simulating 2D water waves directly compute the change in height of the water surface, a strategy which imposes limitations based on the CFL condition (fast moving waves require small time steps) and Nyquist's limit (small wave details require closely-spaced simulation variables). This paper proposes a novel wavelet transformation that discretizes the liquid motion in terms of amplitude-like functions that vary over space, frequency, and direction, effectively generalizing Fourier-based methods to handle local interactions. Because these new variables change much more slowly over space than the original water height function, our change of variables drastically reduces the limitations of the CFL condition and Nyquist limit, allowing us to simulate highly detailed water waves at very large visual resolutions. Our discretization is amenable to fast summation and easy to parallelize. We also present basic extensions like pre-computed wave paths and two-way solid fluid coupling. Finally, we argue that our discretization provides a convenient set of variables for artistic manipulation, which we illustrate with a novel wave-painting interface."}],"acknowledged_ssus":[{"_id":"ScienComp"}],"related_material":{"link":[{"url":"https://ist.ac.at/en/news/new-water-simulation-captures-small-details-even-in-large-scenes/","relation":"press_release","description":"News on IST Homepage"}]},"volume":37,"issue":"4","ec_funded":1,"license":"https://creativecommons.org/licenses/by-nc-sa/4.0/","file":[{"date_created":"2018-12-18T09:59:23Z","file_name":"2018_ACM_Jeschke.pdf","creator":"dernst","date_updated":"2020-07-14T12:44:45Z","file_size":22185016,"checksum":"db75ebabe2ec432bf41389e614d6ef62","file_id":"5744","access_level":"open_access","relation":"main_file","content_type":"application/pdf"}],"language":[{"iso":"eng"}],"publication_status":"published","status":"public","type":"journal_article","tmp":{"name":"Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)","image":"/images/cc_by_nc_sa.png","legal_code_url":"https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode","short":"CC BY-NC-SA (4.0)"},"_id":"134","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:44:45Z","ddc":["000"],"date_updated":"2024-02-28T13:58:51Z","publisher":"ACM","quality_controlled":"1","oa":1,"date_published":"2018-07-30T00:00:00Z","doi":"10.1145/3197517.3201336","date_created":"2018-12-11T11:44:48Z","day":"30","publication":"ACM Transactions on Graphics","isi":1,"has_accepted_license":"1","year":"2018","project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425"},{"call_identifier":"H2020","_id":"2564DBCA-B435-11E9-9278-68D0E5697425","grant_number":"665385","name":"International IST Doctoral Program"}],"article_number":"94","title":"Water surface wavelets","author":[{"id":"44D6411A-F248-11E8-B48F-1D18A9856A87","first_name":"Stefan","last_name":"Jeschke","full_name":"Jeschke, Stefan"},{"first_name":"Tomas","id":"486A5A46-F248-11E8-B48F-1D18A9856A87","last_name":"Skrivan","full_name":"Skrivan, Tomas"},{"last_name":"Mueller Fischer","full_name":"Mueller Fischer, Matthias","first_name":"Matthias"},{"full_name":"Chentanez, Nuttapong","last_name":"Chentanez","first_name":"Nuttapong"},{"first_name":"Miles","full_name":"Macklin, Miles","last_name":"Macklin"},{"full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"publist_id":"7789","article_processing_charge":"No","external_id":{"isi":["000448185000055"]},"user_id":"2EBD1598-F248-11E8-B48F-1D18A9856A87","citation":{"mla":"Jeschke, Stefan, et al. “Water Surface Wavelets.” ACM Transactions on Graphics, vol. 37, no. 4, 94, ACM, 2018, doi:10.1145/3197517.3201336.","ama":"Jeschke S, Skrivan T, Mueller Fischer M, Chentanez N, Macklin M, Wojtan C. Water surface wavelets. ACM Transactions on Graphics. 2018;37(4). doi:10.1145/3197517.3201336","apa":"Jeschke, S., Skrivan, T., Mueller Fischer, M., Chentanez, N., Macklin, M., & Wojtan, C. (2018). Water surface wavelets. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/3197517.3201336","short":"S. Jeschke, T. Skrivan, M. Mueller Fischer, N. Chentanez, M. Macklin, C. Wojtan, ACM Transactions on Graphics 37 (2018).","ieee":"S. Jeschke, T. Skrivan, M. Mueller Fischer, N. Chentanez, M. Macklin, and C. Wojtan, “Water surface wavelets,” ACM Transactions on Graphics, vol. 37, no. 4. ACM, 2018.","chicago":"Jeschke, Stefan, Tomas Skrivan, Matthias Mueller Fischer, Nuttapong Chentanez, Miles Macklin, and Chris Wojtan. “Water Surface Wavelets.” ACM Transactions on Graphics. ACM, 2018. https://doi.org/10.1145/3197517.3201336.","ista":"Jeschke S, Skrivan T, Mueller Fischer M, Chentanez N, Macklin M, Wojtan C. 2018. Water surface wavelets. ACM Transactions on Graphics. 37(4), 94."}},{"_id":"470","status":"public","article_type":"original","type":"journal_article","ddc":["006"],"date_updated":"2023-02-23T12:20:26Z","file_date_updated":"2020-07-14T12:46:34Z","department":[{"_id":"ChWo"}],"oa_version":"Published Version","acknowledged_ssus":[{"_id":"ScienComp"}],"abstract":[{"text":"This paper presents a method for simulating water surface waves as a displacement field on a 2D domain. Our method relies on Lagrangian particles that carry packets of water wave energy; each packet carries information about an entire group of wave trains, as opposed to only a single wave crest. Our approach is unconditionally stable and can simulate high resolution geometric details. This approach also presents a straightforward interface for artistic control, because it is essentially a particle system with intuitive parameters like wavelength and amplitude. Our implementation parallelizes well and runs in real time for moderately challenging scenarios.","lang":"eng"}],"intvolume":" 36","month":"07","scopus_import":1,"language":[{"iso":"eng"}],"file":[{"checksum":"82a3b2bfeee4ddef16ecc21675d1a48a","file_id":"7359","content_type":"application/pdf","access_level":"open_access","relation":"main_file","date_created":"2020-01-24T09:32:35Z","file_name":"wavepackets_final.pdf","date_updated":"2020-07-14T12:46:34Z","file_size":13131683,"creator":"wojtan"}],"publication_status":"published","publication_identifier":{"issn":["07300301"]},"ec_funded":1,"issue":"4","volume":36,"article_number":"103","project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"chicago":"Jeschke, Stefan, and Chris Wojtan. “Water Wave Packets.” ACM Transactions on Graphics. ACM, 2017. https://doi.org/10.1145/3072959.3073678.","ista":"Jeschke S, Wojtan C. 2017. Water wave packets. ACM Transactions on Graphics. 36(4), 103.","mla":"Jeschke, Stefan, and Chris Wojtan. “Water Wave Packets.” ACM Transactions on Graphics, vol. 36, no. 4, 103, ACM, 2017, doi:10.1145/3072959.3073678.","ieee":"S. Jeschke and C. Wojtan, “Water wave packets,” ACM Transactions on Graphics, vol. 36, no. 4. ACM, 2017.","short":"S. Jeschke, C. Wojtan, ACM Transactions on Graphics 36 (2017).","apa":"Jeschke, S., & Wojtan, C. (2017). Water wave packets. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/3072959.3073678","ama":"Jeschke S, Wojtan C. Water wave packets. ACM Transactions on Graphics. 2017;36(4). doi:10.1145/3072959.3073678"},"title":"Water wave packets","article_processing_charge":"Yes (in subscription journal)","publist_id":"7350","author":[{"full_name":"Jeschke, Stefan","last_name":"Jeschke","id":"44D6411A-F248-11E8-B48F-1D18A9856A87","first_name":"Stefan"},{"last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"oa":1,"publisher":"ACM","quality_controlled":"1","publication":"ACM Transactions on Graphics","day":"01","year":"2017","has_accepted_license":"1","date_created":"2018-12-11T11:46:39Z","date_published":"2017-07-01T00:00:00Z","doi":"10.1145/3072959.3073678"},{"article_type":"original","type":"journal_article","status":"public","_id":"670","department":[{"_id":"ChWo"}],"date_updated":"2021-01-12T08:08:37Z","ddc":["000"],"scopus_import":1,"main_file_link":[{"open_access":"1","url":"https://hal.inria.fr/hal-01647113/file/eg_2017_schreck_paper_tearing.pdf"}],"month":"05","intvolume":" 36","abstract":[{"text":"We propose an efficient method to model paper tearing in the context of interactive modeling. The method uses geometrical information to automatically detect potential starting points of tears. We further introduce a new hybrid geometrical and physical-based method to compute the trajectory of tears while procedurally synthesizing high resolution details of the tearing path using a texture based approach. The results obtained are compared with real paper and with previous studies on the expected geometric paths of paper that tears.","lang":"eng"}],"oa_version":"Published Version","volume":36,"issue":"2","publication_identifier":{"issn":["01677055"]},"publication_status":"published","language":[{"iso":"eng"}],"project":[{"name":"Deep Pictures: Creating Visual and Haptic Vector Images","grant_number":"P 24352-N23","_id":"25357BD2-B435-11E9-9278-68D0E5697425","call_identifier":"FWF"}],"publist_id":"7056","author":[{"first_name":"Camille","id":"2B14B676-F248-11E8-B48F-1D18A9856A87","last_name":"Schreck","full_name":"Schreck, Camille"},{"last_name":"Rohmer","full_name":"Rohmer, Damien","first_name":"Damien"},{"first_name":"Stefanie","last_name":"Hahmann","full_name":"Hahmann, Stefanie"}],"article_processing_charge":"No","title":"Interactive paper tearing","citation":{"ista":"Schreck C, Rohmer D, Hahmann S. 2017. Interactive paper tearing. Computer Graphics Forum. 36(2), 95–106.","chicago":"Schreck, Camille, Damien Rohmer, and Stefanie Hahmann. “Interactive Paper Tearing.” Computer Graphics Forum. Wiley, 2017. https://doi.org/10.1111/cgf.13110.","apa":"Schreck, C., Rohmer, D., & Hahmann, S. (2017). Interactive paper tearing. Computer Graphics Forum. Wiley. https://doi.org/10.1111/cgf.13110","ama":"Schreck C, Rohmer D, Hahmann S. Interactive paper tearing. Computer Graphics Forum. 2017;36(2):95-106. doi:10.1111/cgf.13110","ieee":"C. Schreck, D. Rohmer, and S. Hahmann, “Interactive paper tearing,” Computer Graphics Forum, vol. 36, no. 2. Wiley, pp. 95–106, 2017.","short":"C. Schreck, D. Rohmer, S. Hahmann, Computer Graphics Forum 36 (2017) 95–106.","mla":"Schreck, Camille, et al. “Interactive Paper Tearing.” Computer Graphics Forum, vol. 36, no. 2, Wiley, 2017, pp. 95–106, doi:10.1111/cgf.13110."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Wiley","quality_controlled":"1","oa":1,"page":"95 - 106","doi":"10.1111/cgf.13110","date_published":"2017-05-01T00:00:00Z","date_created":"2018-12-11T11:47:49Z","year":"2017","day":"01","publication":"Computer Graphics Forum"},{"issue":"6","volume":36,"publication_status":"published","publication_identifier":{"issn":["01677055"]},"language":[{"iso":"eng"}],"file":[{"relation":"main_file","access_level":"open_access","content_type":"application/pdf","file_id":"5208","checksum":"7676e9a9ead6d58c3000988c97deb2ef","creator":"system","file_size":1434439,"date_updated":"2020-07-14T12:44:47Z","file_name":"IST-2016-634-v1+1_starAdaptivity-cgf.pdf","date_created":"2018-12-12T10:16:21Z"}],"scopus_import":"1","intvolume":" 36","month":"09","abstract":[{"lang":"eng","text":"One of the major challenges in physically based modelling is making simulations efficient. Adaptive models provide an essential solution to these efficiency goals. These models are able to self-adapt in space and time, attempting to provide the best possible compromise between accuracy and speed. This survey reviews the adaptive solutions proposed so far in computer graphics. Models are classified according to the strategy they use for adaptation, from time-stepping and freezing techniques to geometric adaptivity in the form of structured grids, meshes and particles. Applications range from fluids, through deformable bodies, to articulated solids."}],"oa_version":"Submitted Version","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:44:47Z","date_updated":"2023-09-20T11:05:36Z","ddc":["000"],"type":"journal_article","pubrep_id":"634","status":"public","_id":"1367","page":"312 - 337","date_created":"2018-12-11T11:51:37Z","date_published":"2017-09-01T00:00:00Z","doi":"10.1111/cgf.12941","year":"2017","has_accepted_license":"1","isi":1,"publication":"Computer Graphics Forum","day":"01","oa":1,"quality_controlled":"1","publisher":"Wiley-Blackwell","acknowledgement":"This work was partly supported by the starting grants ADAPT and BigSplash, as well as the advanced grant EXPRESSIVE from the European Research Council (ERC-2012-StG_20111012, ERC-2014-StG_638176 and ERC-2011-ADG_20110209).","external_id":{"isi":["000408634200019"]},"article_processing_charge":"No","author":[{"first_name":"Pierre","full_name":"Manteaux, Pierre","last_name":"Manteaux"},{"full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Rahul","full_name":"Narain, Rahul","last_name":"Narain"},{"full_name":"Redon, Stéphane","last_name":"Redon","first_name":"Stéphane"},{"first_name":"François","full_name":"Faure, François","last_name":"Faure"},{"last_name":"Cani","full_name":"Cani, Marie","first_name":"Marie"}],"publist_id":"5873","title":"Adaptive physically based models in computer graphics","citation":{"mla":"Manteaux, Pierre, et al. “Adaptive Physically Based Models in Computer Graphics.” Computer Graphics Forum, vol. 36, no. 6, Wiley-Blackwell, 2017, pp. 312–37, doi:10.1111/cgf.12941.","apa":"Manteaux, P., Wojtan, C., Narain, R., Redon, S., Faure, F., & Cani, M. (2017). Adaptive physically based models in computer graphics. Computer Graphics Forum. Wiley-Blackwell. https://doi.org/10.1111/cgf.12941","ama":"Manteaux P, Wojtan C, Narain R, Redon S, Faure F, Cani M. Adaptive physically based models in computer graphics. Computer Graphics Forum. 2017;36(6):312-337. doi:10.1111/cgf.12941","ieee":"P. Manteaux, C. Wojtan, R. Narain, S. Redon, F. Faure, and M. Cani, “Adaptive physically based models in computer graphics,” Computer Graphics Forum, vol. 36, no. 6. Wiley-Blackwell, pp. 312–337, 2017.","short":"P. Manteaux, C. Wojtan, R. Narain, S. Redon, F. Faure, M. Cani, Computer Graphics Forum 36 (2017) 312–337.","chicago":"Manteaux, Pierre, Chris Wojtan, Rahul Narain, Stéphane Redon, François Faure, and Marie Cani. “Adaptive Physically Based Models in Computer Graphics.” Computer Graphics Forum. Wiley-Blackwell, 2017. https://doi.org/10.1111/cgf.12941.","ista":"Manteaux P, Wojtan C, Narain R, Redon S, Faure F, Cani M. 2017. Adaptive physically based models in computer graphics. Computer Graphics Forum. 36(6), 312–337."},"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1"},{"_id":"1152","status":"public","type":"journal_article","ddc":["000"],"date_updated":"2023-09-20T11:29:44Z","file_date_updated":"2019-01-18T08:43:16Z","department":[{"_id":"ChWo"}],"oa_version":"Submitted Version","abstract":[{"text":"We propose a new memetic strategy that can solve the multi-physics, complex inverse problems, formulated as the multi-objective optimization ones, in which objectives are misfits between the measured and simulated states of various governing processes. The multi-deme structure of the strategy allows for both, intensive, relatively cheap exploration with a moderate accuracy and more accurate search many regions of Pareto set in parallel. The special type of selection operator prefers the coherent alternative solutions, eliminating artifacts appearing in the particular processes. The additional accuracy increment is obtained by the parallel convex searches applied to the local scalarizations of the misfit vector. The strategy is dedicated for solving ill-conditioned problems, for which inverting the single physical process can lead to the ambiguous results. The skill of the selection in artifact elimination is shown on the benchmark problem, while the whole strategy was applied for identification of oil deposits, where the misfits are related to various frequencies of the magnetic and electric waves of the magnetotelluric measurements. 2016 Elsevier B.V.","lang":"eng"}],"intvolume":" 18","month":"01","scopus_import":"1","language":[{"iso":"eng"}],"file":[{"file_size":1083911,"date_updated":"2019-01-18T08:43:16Z","creator":"dernst","file_name":"2016_jocs_ewa.pdf","date_created":"2019-01-18T08:43:16Z","content_type":"application/pdf","relation":"main_file","access_level":"open_access","success":1,"file_id":"5842"}],"publication_status":"published","publication_identifier":{"issn":["18777503"]},"volume":18,"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","citation":{"chicago":"Gajda-Zagorska, Ewa P, Robert Schaefer, Maciej Smołka, David Pardo, and Julen Alvarez Aramberri. “A Multi Objective Memetic Inverse Solver Reinforced by Local Optimization Methods.” Journal of Computational Science. Elsevier, 2017. https://doi.org/10.1016/j.jocs.2016.06.007.","ista":"Gajda-Zagorska EP, Schaefer R, Smołka M, Pardo D, Alvarez Aramberri J. 2017. A multi objective memetic inverse solver reinforced by local optimization methods. Journal of Computational Science. 18, 85–94.","mla":"Gajda-Zagorska, Ewa P., et al. “A Multi Objective Memetic Inverse Solver Reinforced by Local Optimization Methods.” Journal of Computational Science, vol. 18, Elsevier, 2017, pp. 85–94, doi:10.1016/j.jocs.2016.06.007.","ieee":"E. P. Gajda-Zagorska, R. Schaefer, M. Smołka, D. Pardo, and J. Alvarez Aramberri, “A multi objective memetic inverse solver reinforced by local optimization methods,” Journal of Computational Science, vol. 18. Elsevier, pp. 85–94, 2017.","short":"E.P. Gajda-Zagorska, R. Schaefer, M. Smołka, D. Pardo, J. Alvarez Aramberri, Journal of Computational Science 18 (2017) 85–94.","apa":"Gajda-Zagorska, E. P., Schaefer, R., Smołka, M., Pardo, D., & Alvarez Aramberri, J. (2017). A multi objective memetic inverse solver reinforced by local optimization methods. Journal of Computational Science. Elsevier. https://doi.org/10.1016/j.jocs.2016.06.007","ama":"Gajda-Zagorska EP, Schaefer R, Smołka M, Pardo D, Alvarez Aramberri J. A multi objective memetic inverse solver reinforced by local optimization methods. Journal of Computational Science. 2017;18:85-94. doi:10.1016/j.jocs.2016.06.007"},"title":"A multi objective memetic inverse solver reinforced by local optimization methods","external_id":{"isi":["000393528700009"]},"article_processing_charge":"No","publist_id":"6206","author":[{"id":"47794CF0-F248-11E8-B48F-1D18A9856A87","first_name":"Ewa P","full_name":"Gajda-Zagorska, Ewa P","last_name":"Gajda-Zagorska"},{"full_name":"Schaefer, Robert","last_name":"Schaefer","first_name":"Robert"},{"first_name":"Maciej","full_name":"Smołka, Maciej","last_name":"Smołka"},{"last_name":"Pardo","full_name":"Pardo, David","first_name":"David"},{"full_name":"Alvarez Aramberri, Julen","last_name":"Alvarez Aramberri","first_name":"Julen"}],"oa":1,"quality_controlled":"1","publisher":"Elsevier","publication":"Journal of Computational Science","day":"01","year":"2017","isi":1,"has_accepted_license":"1","date_created":"2018-12-11T11:50:26Z","date_published":"2017-01-01T00:00:00Z","doi":"10.1016/j.jocs.2016.06.007","page":"85 - 94"},{"date_updated":"2023-09-22T09:51:58Z","department":[{"_id":"ChLa"},{"_id":"ChWo"}],"_id":"998","conference":{"name":"CVPR: Computer Vision and Pattern Recognition","start_date":"2017-07-21","location":"Honolulu, HA, United States","end_date":"2017-07-26"},"type":"conference","status":"public","publication_status":"published","publication_identifier":{"isbn":["978-153860457-1"]},"language":[{"iso":"eng"}],"ec_funded":1,"volume":2017,"abstract":[{"text":"A major open problem on the road to artificial intelligence is the development of incrementally learning systems that learn about more and more concepts over time from a stream of data. In this work, we introduce a new training strategy, iCaRL, that allows learning in such a class-incremental way: only the training data for a small number of classes has to be present at the same time and new classes can be added progressively. iCaRL learns strong classifiers and a data representation simultaneously. This distinguishes it from earlier works that were fundamentally limited to fixed data representations and therefore incompatible with deep learning architectures. We show by experiments on CIFAR-100 and ImageNet ILSVRC 2012 data that iCaRL can learn many classes incrementally over a long period of time where other strategies quickly fail. ","lang":"eng"}],"oa_version":"Submitted Version","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1611.07725"}],"scopus_import":"1","intvolume":" 2017","month":"04","citation":{"mla":"Rebuffi, Sylvestre Alvise, et al. ICaRL: Incremental Classifier and Representation Learning. 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Building upon a symmetric Galerkin boundary element method, we first compute stress intensity factors following the theory of linear elastic fracture mechanics. We then use these stress intensities to simulate the motion of a propagating crack front at a significantly higher resolution than the overall deformation of the breaking object. Allowing for spatial variations of the material's toughness during crack propagation produces visually realistic, highly-detailed fracture surfaces. Furthermore, we introduce approximations for stress intensities and crack opening displacements, resulting in both practical speed-up and theoretically superior runtime complexity compared to previous methods. While we choose a quasi-static approach to fracture mechanics, ignoring dynamic deformations, we also couple our fracture simulation framework to a standard rigid-body dynamics solver, enabling visual effects artists to simulate both large scale motion, as well as fracturing due to collision forces in a combined system. As fractures inside of an object grow, their geometry must be represented both in the coarse boundary element mesh, as well as at the desired fine output resolution. Using a boundary element method, we avoid complicated volumetric meshing operations. Instead we describe a simple set of surface meshing operations that allow us to progressively add cracks to the mesh of an object and still re-use all previously computed entries of the linear boundary element system matrix. On the high resolution level, we opt for an implicit surface representation. We then describe how to capture fracture surfaces during crack propagation, as well as separate the individual fragments resulting from the fracture process, based on this implicit representation. We show results obtained with our method, either solving the full boundary element system in every time step, or alternatively using our fast approximations. These results demonstrate that both of these methods perform well in basic test cases and produce realistic fracture surfaces. Furthermore we show that our fast approximations substantially out-perform the standard approach in more demanding scenarios. Finally, these two methods naturally combine, using the full solution while the problem size is manageably small and switching to the fast approximations later on. The resulting hybrid method gives the user a direct way to choose between speed and accuracy of the simulation. "}],"file_date_updated":"2020-07-14T12:48:13Z","department":[{"_id":"ChWo"}],"ddc":["004","005","006","531","621"],"date_updated":"2024-02-21T13:48:02Z","supervisor":[{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546"}],"pubrep_id":"855","status":"public","tmp":{"short":"CC BY-SA (4.0)","image":"/images/cc_by_sa.png","legal_code_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","name":"Creative Commons Attribution-ShareAlike 4.0 International Public License (CC BY-SA 4.0)"},"type":"dissertation","_id":"839","date_created":"2018-12-11T11:48:47Z","date_published":"2017-08-14T00:00:00Z","doi":"10.15479/AT:ISTA:th_855","page":"124","day":"14","year":"2017","has_accepted_license":"1","oa":1,"publisher":"Institute of Science and Technology Austria","acknowledgement":"ERC H2020 programme (grant agreement no. 638176)\r\nFirst of all, let me thank my committee members, especially my supervisor, Chris\r\nWojtan, for supporting me throughout my PhD. Obviously, none of this work would\r\nhave been possible without you.\r\nFurthermore, Thank You to all the people who have contributed to this work in various\r\nways, in particular Martin Schanz and his group for providing and supporting the\r\nHyENA boundary element library, as well as Eder Miguel and Morten Bojsen-Hansen\r\nfor (repeatedly) proof reading and providing valuable suggestions during the writing\r\nof this thesis.\r\nI would also like to thank Bernd Bickel, and all the members – past and present – of his\r\nand Chris’ research groups at IST Austria for always providing honest and insightful\r\nfeedback throughout many joint group meetings, as well as Christopher Batty, Eitan\r\nGrinspun, and Fang Da for many insights into boundary element methods during our\r\ncollaboration.\r\nAs only virtual objects have been harmed in the process of creating this work, I would\r\nlike to acknowledge the Stanford scanning repository for providing the “Bunny” and\r\n“Armadillo” models, the AIM@SHAPE repository for “Pierre’s hand, watertight”, and\r\nS. Gainsbourg for the “Column” via Archive3D.net. Sorry for breaking these models\r\nin many different ways.\r\n","title":"Brittle fracture simulation with boundary elements for computer graphics","article_processing_charge":"No","publist_id":"6809","author":[{"last_name":"Hahn","full_name":"Hahn, David","id":"357A6A66-F248-11E8-B48F-1D18A9856A87","first_name":"David"}],"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","citation":{"ama":"Hahn D. Brittle fracture simulation with boundary elements for computer graphics. 2017. doi:10.15479/AT:ISTA:th_855","apa":"Hahn, D. (2017). Brittle fracture simulation with boundary elements for computer graphics. Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:th_855","short":"D. Hahn, Brittle Fracture Simulation with Boundary Elements for Computer Graphics, Institute of Science and Technology Austria, 2017.","ieee":"D. Hahn, “Brittle fracture simulation with boundary elements for computer graphics,” Institute of Science and Technology Austria, 2017.","mla":"Hahn, David. Brittle Fracture Simulation with Boundary Elements for Computer Graphics. Institute of Science and Technology Austria, 2017, doi:10.15479/AT:ISTA:th_855.","ista":"Hahn D. 2017. Brittle fracture simulation with boundary elements for computer graphics. Institute of Science and Technology Austria.","chicago":"Hahn, David. “Brittle Fracture Simulation with Boundary Elements for Computer Graphics.” Institute of Science and Technology Austria, 2017. https://doi.org/10.15479/AT:ISTA:th_855."},"project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}]},{"type":"research_data","tmp":{"short":"CC BY-SA (4.0)","image":"/images/cc_by_sa.png","legal_code_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","name":"Creative Commons Attribution-ShareAlike 4.0 International Public License (CC BY-SA 4.0)"},"status":"public","project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"keyword":["Boundary elements","brittle fracture","computer graphics","fracture simulation"],"_id":"5568","author":[{"id":"357A6A66-F248-11E8-B48F-1D18A9856A87","first_name":"David","last_name":"Hahn","full_name":"Hahn, David"}],"article_processing_charge":"No","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:47:04Z","title":"Source codes: Brittle fracture simulation with boundary elements for computer graphics","citation":{"chicago":"Hahn, David. “Source Codes: Brittle Fracture Simulation with Boundary Elements for Computer Graphics.” Institute of Science and Technology Austria, 2017. https://doi.org/10.15479/AT:ISTA:73.","ista":"Hahn D. 2017. Source codes: Brittle fracture simulation with boundary elements for computer graphics, Institute of Science and Technology Austria, 10.15479/AT:ISTA:73.","mla":"Hahn, David. Source Codes: Brittle Fracture Simulation with Boundary Elements for Computer Graphics. Institute of Science and Technology Austria, 2017, doi:10.15479/AT:ISTA:73.","short":"D. Hahn, (2017).","ieee":"D. Hahn, “Source codes: Brittle fracture simulation with boundary elements for computer graphics.” Institute of Science and Technology Austria, 2017.","apa":"Hahn, D. (2017). Source codes: Brittle fracture simulation with boundary elements for computer graphics. Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:73","ama":"Hahn D. 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Also includes pre-built binaries of the HyENA library, but not sources - please contact the HyENA authors to obtain these sources if required (https://mech.tugraz.at/hyena)","lang":"eng"}],"oa_version":"Published Version","related_material":{"record":[{"id":"839","status":"public","relation":"research_paper"}]},"doi":"10.15479/AT:ISTA:73","date_published":"2017-08-16T00:00:00Z","date_created":"2018-12-12T12:31:35Z","ec_funded":1,"has_accepted_license":"1","year":"2017","datarep_id":"73","day":"16","file":[{"file_name":"IST-2017-73-v1+1_FractureRB_v1.1_2017_07_20_final_public.zip","date_created":"2018-12-12T13:02:57Z","creator":"system","file_size":199353471,"date_updated":"2020-07-14T12:47:04Z","checksum":"2323a755842a3399cbc47d76545fc9a0","file_id":"5615","relation":"main_file","access_level":"open_access","content_type":"application/zip"}]},{"month":"10","main_file_link":[{"url":"https://hal.inria.fr/hal-01367181","open_access":"1"}],"scopus_import":"1","oa_version":"Submitted Version","abstract":[{"lang":"eng","text":"We propose an interactive sculpting system for seamlessly editing pre-computed animations of liquid, without the need for any resimulation. The input is a sequence of meshes without correspondences representing the liquid surface over time. Our method enables the efficient selection of consistent space-time parts of this animation, such as moving waves or droplets, which we call space-time features. Once selected, a feature can be copied, edited, or duplicated and then pasted back anywhere in space and time in the same or in another liquid animation sequence. Our method circumvents tedious user interactions by automatically computing the spatial and temporal ranges of the selected feature. We also provide space-time shape editing tools for non-uniform scaling, rotation, trajectory changes, and temporal editing to locally speed up or slow down motion. Using our tools, the user can edit and progressively refine any input simulation result, possibly using a library of precomputed space-time features extracted from other animations. In contrast to the trial-and-error loop usually required to edit animation results through the tuning of indirect simulation parameters, our method gives the user full control over the edited space-time behaviors. © 2016 Copyright held by the owner/author(s)."}],"ec_funded":1,"language":[{"iso":"eng"}],"publication_status":"published","status":"public","conference":{"name":"MIG: Motion in Games","start_date":"2016-10-10","location":"San Francisco, CA, USA","end_date":"2016-10-12"},"type":"conference","_id":"1136","department":[{"_id":"ChWo"}],"ddc":["004"],"date_updated":"2023-02-21T09:49:49Z","oa":1,"quality_controlled":"1","publisher":"ACM","acknowledgement":"This work was partly supported by the starting grant BigSplash, as well as the advanced grant EXPRESSIVE from the European Research Council (ERC-2014-StG 638176 , and ERC-2011-ADG 20110209).","date_created":"2018-12-11T11:50:20Z","date_published":"2016-10-10T00:00:00Z","doi":"10.1145/2994258.2994261","publication":"Proceedings of the 9th International Conference on Motion in Games ","day":"10","year":"2016","has_accepted_license":"1","project":[{"call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"}],"article_number":"2994261","title":"Space-time sculpting of liquid animation","article_processing_charge":"No","author":[{"full_name":"Manteaux, Pierre","last_name":"Manteaux","first_name":"Pierre"},{"last_name":"Vimont","full_name":"Vimont, Ulysse","first_name":"Ulysse"},{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J"},{"first_name":"Damien","full_name":"Rohmer, Damien","last_name":"Rohmer"},{"first_name":"Marie","full_name":"Cani, Marie","last_name":"Cani"}],"publist_id":"6222","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"mla":"Manteaux, Pierre, et al. “Space-Time Sculpting of Liquid Animation.” Proceedings of the 9th International Conference on Motion in Games , 2994261, ACM, 2016, doi:10.1145/2994258.2994261.","ieee":"P. Manteaux, U. Vimont, C. Wojtan, D. Rohmer, and M. Cani, “Space-time sculpting of liquid animation,” in Proceedings of the 9th International Conference on Motion in Games , San Francisco, CA, USA, 2016.","short":"P. Manteaux, U. Vimont, C. Wojtan, D. Rohmer, M. Cani, in:, Proceedings of the 9th International Conference on Motion in Games , ACM, 2016.","ama":"Manteaux P, Vimont U, Wojtan C, Rohmer D, Cani M. Space-time sculpting of liquid animation. In: Proceedings of the 9th International Conference on Motion in Games . ACM; 2016. doi:10.1145/2994258.2994261","apa":"Manteaux, P., Vimont, U., Wojtan, C., Rohmer, D., & Cani, M. (2016). Space-time sculpting of liquid animation. In Proceedings of the 9th International Conference on Motion in Games . San Francisco, CA, USA: ACM. https://doi.org/10.1145/2994258.2994261","chicago":"Manteaux, Pierre, Ulysse Vimont, Chris Wojtan, Damien Rohmer, and Marie Cani. “Space-Time Sculpting of Liquid Animation.” In Proceedings of the 9th International Conference on Motion in Games . ACM, 2016. https://doi.org/10.1145/2994258.2994261.","ista":"Manteaux P, Vimont U, Wojtan C, Rohmer D, Cani M. 2016. Space-time sculpting of liquid animation. Proceedings of the 9th International Conference on Motion in Games . MIG: Motion in Games, 2994261."}},{"day":"01","publication":"Journal of Computational Science","language":[{"iso":"eng"}],"year":"2016","publication_status":"published","date_published":"2016-11-01T00:00:00Z","issue":"1","volume":17,"doi":"10.1016/j.jocs.2016.03.004","date_created":"2018-12-11T11:50:22Z","page":"249 - 260","oa_version":"None","acknowledgement":"The work presented in this paper was partially supported by Polish National Science Centre grant nos. DEC-2012/05/N/ST6/03433 and DEC-2011/03/B/ST6/01393. Radosław Łazarz was supported by Polish National Science Centre grant no. DEC-2013/10/M/ST6/00531.","abstract":[{"lang":"eng","text":"In this paper we introduce the Multiobjective Optimization Hierarchic Genetic Strategy with maturing (MO-mHGS), a meta-algorithm that performs evolutionary optimization in a hierarchy of populations. The maturing mechanism improves growth and reduces redundancy. The performance of MO-mHGS with selected state-of-the-art multiobjective evolutionary algorithms as internal algorithms is analysed on benchmark problems and their modifications for which single fitness evaluation time depends on the solution accuracy. We compare the proposed algorithm with the Island Model Genetic Algorithm as well as with single-deme methods, and discuss the impact of internal algorithms on the MO-mHGS meta-algorithm. © 2016 Elsevier B.V."}],"month":"11","intvolume":" 17","quality_controlled":"1","scopus_import":1,"publisher":"Elsevier","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","citation":{"mla":"Łazarz, Radosław, et al. “Hierarchic Genetic Strategy with Maturing as a Generic Tool for Multiobjective Optimization.” Journal of Computational Science, vol. 17, no. 1, Elsevier, 2016, pp. 249–60, doi:10.1016/j.jocs.2016.03.004.","short":"R. Łazarz, M. Idzik, K. Gądek, E.P. Gajda-Zagorska, Journal of Computational Science 17 (2016) 249–260.","ieee":"R. Łazarz, M. Idzik, K. Gądek, and E. P. Gajda-Zagorska, “Hierarchic genetic strategy with maturing as a generic tool for multiobjective optimization,” Journal of Computational Science, vol. 17, no. 1. Elsevier, pp. 249–260, 2016.","apa":"Łazarz, R., Idzik, M., Gądek, K., & Gajda-Zagorska, E. P. (2016). Hierarchic genetic strategy with maturing as a generic tool for multiobjective optimization. Journal of Computational Science. Elsevier. https://doi.org/10.1016/j.jocs.2016.03.004","ama":"Łazarz R, Idzik M, Gądek K, Gajda-Zagorska EP. Hierarchic genetic strategy with maturing as a generic tool for multiobjective optimization. Journal of Computational Science. 2016;17(1):249-260. doi:10.1016/j.jocs.2016.03.004","chicago":"Łazarz, Radosław, Michał Idzik, Konrad Gądek, and Ewa P Gajda-Zagorska. “Hierarchic Genetic Strategy with Maturing as a Generic Tool for Multiobjective Optimization.” Journal of Computational Science. Elsevier, 2016. https://doi.org/10.1016/j.jocs.2016.03.004.","ista":"Łazarz R, Idzik M, Gądek K, Gajda-Zagorska EP. 2016. Hierarchic genetic strategy with maturing as a generic tool for multiobjective optimization. Journal of Computational Science. 17(1), 249–260."},"date_updated":"2021-01-12T06:48:35Z","title":"Hierarchic genetic strategy with maturing as a generic tool for multiobjective optimization","department":[{"_id":"ChWo"}],"publist_id":"6217","author":[{"first_name":"Radosław","full_name":"Łazarz, Radosław","last_name":"Łazarz"},{"full_name":"Idzik, Michał","last_name":"Idzik","first_name":"Michał"},{"first_name":"Konrad","last_name":"Gądek","full_name":"Gądek, Konrad"},{"first_name":"Ewa P","id":"47794CF0-F248-11E8-B48F-1D18A9856A87","full_name":"Gajda-Zagorska, Ewa P","last_name":"Gajda-Zagorska"}],"_id":"1141","status":"public","type":"journal_article"},{"date_updated":"2023-02-21T10:36:12Z","ddc":["000"],"file_date_updated":"2020-07-14T12:44:47Z","department":[{"_id":"ChWo"}],"_id":"1363","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"conference":{"location":"Anaheim, CA, USA","end_date":"2016-07-28","start_date":"2016-07-24","name":"ACM SIGGRAPH"},"type":"conference","pubrep_id":"631","status":"public","publication_status":"published","language":[{"iso":"eng"}],"file":[{"checksum":"140b5532f0a2a006a0149cab7c73c17c","file_id":"4981","relation":"main_file","access_level":"open_access","content_type":"application/pdf","file_name":"IST-2016-631-v1+2_a96-bojsen-hansen.pdf","date_created":"2018-12-12T10:13:00Z","creator":"system","file_size":12422760,"date_updated":"2020-07-14T12:44:47Z"}],"ec_funded":1,"volume":35,"issue":"4","acknowledged_ssus":[{"_id":"ScienComp"}],"abstract":[{"lang":"eng","text":"When aiming to seamlessly integrate a fluid simulation into a larger scenario (like an open ocean), careful attention must be paid to boundary conditions. In particular, one must implement special "non-reflecting" boundary conditions, which dissipate out-going waves as they exit the simulation. Unfortunately, the state of the art in non-reflecting boundary conditions (perfectly-matched layers, or PMLs) only permits trivially simple inflow/outflow conditions, so there is no reliable way to integrate a fluid simulation into a more complicated environment like a stormy ocean or a turbulent river. This paper introduces the first method for combining nonreflecting boundary conditions based on PMLs with inflow/outflow boundary conditions that vary arbitrarily throughout space and time. Our algorithm is a generalization of stateof- the-art mean-flow boundary conditions in the computational fluid dynamics literature, and it allows for seamless integration of a fluid simulation into much more complicated environments. Our method also opens the door for previously-unseen postprocess effects like retroactively changing the location of solid obstacles, and locally increasing the visual detail of a pre-existing simulation."}],"oa_version":"Published Version","alternative_title":["ACM Transactions on Graphics"],"intvolume":" 35","month":"07","citation":{"ista":"Bojsen-Hansen M, Wojtan C. 2016. Generalized non-reflecting boundaries for fluid re-simulation. ACM SIGGRAPH, ACM Transactions on Graphics, vol. 35, 96.","chicago":"Bojsen-Hansen, Morten, and Chris Wojtan. “Generalized Non-Reflecting Boundaries for Fluid Re-Simulation,” Vol. 35. ACM, 2016. https://doi.org/10.1145/2897824.2925963.","short":"M. Bojsen-Hansen, C. Wojtan, in:, ACM, 2016.","ieee":"M. Bojsen-Hansen and C. Wojtan, “Generalized non-reflecting boundaries for fluid re-simulation,” presented at the ACM SIGGRAPH, Anaheim, CA, USA, 2016, vol. 35, no. 4.","ama":"Bojsen-Hansen M, Wojtan C. 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Vol. 35, no. 4, 96, ACM, 2016, doi:10.1145/2897824.2925963."},"user_id":"4435EBFC-F248-11E8-B48F-1D18A9856A87","publist_id":"5879","author":[{"id":"439F0C8C-F248-11E8-B48F-1D18A9856A87","first_name":"Morten","last_name":"Bojsen-Hansen","orcid":"0000-0002-4417-3224","full_name":"Bojsen-Hansen, Morten"},{"orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"title":"Generalized non-reflecting boundaries for fluid re-simulation","article_number":"96","project":[{"_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176"}],"year":"2016","has_accepted_license":"1","day":"11","date_created":"2018-12-11T11:51:35Z","date_published":"2016-07-11T00:00:00Z","doi":"10.1145/2897824.2925963","acknowledgement":"We thank the IST Austria Visual Computing group for helpful feedback throughout the project. ","oa":1,"quality_controlled":"1","publisher":"ACM"},{"_id":"1361","type":"conference","conference":{"location":"Anaheim, CA, USA","end_date":"2016-07-28","start_date":"2016-07-24","name":"ACM SIGGRAPH"},"status":"public","pubrep_id":"637","date_updated":"2023-02-21T10:36:07Z","ddc":["000"],"department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:44:46Z","abstract":[{"lang":"eng","text":"We propose a novel surface-only technique for simulating incompressible, inviscid and uniform-density liquids with surface tension in three dimensions. The liquid surface is captured by a triangle mesh on which a Lagrangian velocity field is stored. Because advection of the velocity field may violate the incompressibility condition, we devise an orthogonal projection technique to remove the divergence while requiring the evaluation of only two boundary integrals. The forces of surface tension, gravity, and solid contact are all treated by a boundary element solve, allowing us to perform detailed simulations of a wide range of liquid phenomena, including waterbells, droplet and jet collisions, fluid chains, and crown splashes."}],"oa_version":"Published Version","scopus_import":1,"alternative_title":["ACM Transactions on Graphics"],"month":"07","intvolume":" 35","publication_status":"published","file":[{"access_level":"open_access","relation":"main_file","content_type":"application/pdf","file_id":"4660","checksum":"6d662893bd447d4f575b4961a2247811","creator":"system","date_updated":"2020-07-14T12:44:46Z","file_size":10561865,"date_created":"2018-12-12T10:08:01Z","file_name":"IST-2016-637-v1+1_2016_Da_SOL.pdf"}],"language":[{"iso":"eng"}],"volume":35,"issue":"4","ec_funded":1,"article_number":"a78","project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"citation":{"chicago":"Da, Fang, David Hahn, Christopher Batty, Chris Wojtan, and Eitan Grinspun. “Surface Only Liquids,” Vol. 35. ACM, 2016. https://doi.org/10.1145/2897824.2925899.","ista":"Da F, Hahn D, Batty C, Wojtan C, Grinspun E. 2016. Surface only liquids. ACM SIGGRAPH, ACM Transactions on Graphics, vol. 35, a78.","mla":"Da, Fang, et al. Surface Only Liquids. Vol. 35, no. 4, a78, ACM, 2016, doi:10.1145/2897824.2925899.","short":"F. Da, D. Hahn, C. Batty, C. Wojtan, E. Grinspun, in:, ACM, 2016.","ieee":"F. Da, D. Hahn, C. Batty, C. Wojtan, and E. Grinspun, “Surface only liquids,” presented at the ACM SIGGRAPH, Anaheim, CA, USA, 2016, vol. 35, no. 4.","ama":"Da F, Hahn D, Batty C, Wojtan C, Grinspun E. Surface only liquids. In: Vol 35. ACM; 2016. doi:10.1145/2897824.2925899","apa":"Da, F., Hahn, D., Batty, C., Wojtan, C., & Grinspun, E. (2016). Surface only liquids (Vol. 35). Presented at the ACM SIGGRAPH, Anaheim, CA, USA: ACM. https://doi.org/10.1145/2897824.2925899"},"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","author":[{"first_name":"Fang","last_name":"Da","full_name":"Da, Fang"},{"first_name":"David","id":"357A6A66-F248-11E8-B48F-1D18A9856A87","full_name":"Hahn, David","last_name":"Hahn"},{"first_name":"Christopher","last_name":"Batty","full_name":"Batty, Christopher"},{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan"},{"first_name":"Eitan","last_name":"Grinspun","full_name":"Grinspun, Eitan"}],"publist_id":"5881","title":"Surface only liquids","quality_controlled":"1","publisher":"ACM","oa":1,"has_accepted_license":"1","year":"2016","day":"11","date_published":"2016-07-11T00:00:00Z","doi":"10.1145/2897824.2925899","date_created":"2018-12-11T11:51:35Z"},{"ddc":["000"],"date_updated":"2023-02-21T10:38:30Z","file_date_updated":"2020-07-14T12:44:53Z","department":[{"_id":"ChWo"}],"_id":"1412","status":"public","pubrep_id":"612","type":"journal_article","file":[{"file_name":"IST-2016-612-v1+2_Wojtan_APracticalMethod_PostPrint_2016.pdf","date_created":"2018-12-12T10:13:18Z","creator":"system","file_size":15873858,"date_updated":"2020-07-14T12:44:53Z","file_id":"5000","checksum":"8e61387ee2e3bd0e776fbe301629bfd9","relation":"main_file","access_level":"open_access","content_type":"application/pdf"}],"language":[{"iso":"eng"}],"publication_status":"published","volume":35,"issue":"2","ec_funded":1,"oa_version":"Submitted Version","abstract":[{"text":"Combining high-resolution level set surface tracking with lower resolution physics is an inexpensive method for achieving highly detailed liquid animations. Unfortunately, the inherent resolution mismatch introduces several types of disturbing visual artifacts. We identify the primary sources of these artifacts and present simple, efficient, and practical solutions to address them. First, we propose an unconditionally stable filtering method that selectively removes sub-grid surface artifacts not seen by the fluid physics, while preserving fine detail in dynamic splashing regions. It provides comparable results to recent error-correction techniques at lower cost, without substepping, and with better scaling behavior. Second, we show how a modified narrow-band scheme can ensure accurate free surface boundary conditions in the presence of large resolution mismatches. Our scheme preserves the efficiency of the narrow-band methodology, while eliminating objectionable stairstep artifacts observed in prior work. Third, we demonstrate that the use of linear interpolation of velocity during advection of the high-resolution level set surface is responsible for visible grid-aligned kinks; we therefore advocate higher-order velocity interpolation, and show that it dramatically reduces this artifact. While these three contributions are orthogonal, our results demonstrate that taken together they efficiently address the dominant sources of visual artifacts arising with high-resolution embedded liquid surfaces; the proposed approach offers improved visual quality, a straightforward implementation, and substantially greater scalability than competing methods.","lang":"eng"}],"month":"05","intvolume":" 35","scopus_import":1,"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","citation":{"mla":"Goldade, Ryan, et al. “A Practical Method for High-Resolution Embedded Liquid Surfaces.” Computer Graphics Forum, vol. 35, no. 2, Wiley-Blackwell, 2016, pp. 233–42, doi:10.1111/cgf.12826.","ama":"Goldade R, Batty C, Wojtan C. A practical method for high-resolution embedded liquid surfaces. Computer Graphics Forum. 2016;35(2):233-242. doi:10.1111/cgf.12826","apa":"Goldade, R., Batty, C., & Wojtan, C. (2016). A practical method for high-resolution embedded liquid surfaces. Computer Graphics Forum. Wiley-Blackwell. https://doi.org/10.1111/cgf.12826","short":"R. Goldade, C. Batty, C. Wojtan, Computer Graphics Forum 35 (2016) 233–242.","ieee":"R. Goldade, C. Batty, and C. Wojtan, “A practical method for high-resolution embedded liquid surfaces,” Computer Graphics Forum, vol. 35, no. 2. Wiley-Blackwell, pp. 233–242, 2016.","chicago":"Goldade, Ryan, Christopher Batty, and Chris Wojtan. “A Practical Method for High-Resolution Embedded Liquid Surfaces.” Computer Graphics Forum. Wiley-Blackwell, 2016. https://doi.org/10.1111/cgf.12826.","ista":"Goldade R, Batty C, Wojtan C. 2016. A practical method for high-resolution embedded liquid surfaces. Computer Graphics Forum. 35(2), 233–242."},"title":"A practical method for high-resolution embedded liquid surfaces","author":[{"first_name":"Ryan","last_name":"Goldade","full_name":"Goldade, Ryan"},{"first_name":"Christopher","full_name":"Batty, Christopher","last_name":"Batty"},{"last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"publist_id":"5795","project":[{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"day":"27","publication":"Computer Graphics Forum","has_accepted_license":"1","year":"2016","date_published":"2016-05-27T00:00:00Z","doi":"10.1111/cgf.12826","date_created":"2018-12-11T11:51:52Z","page":"233 - 242","acknowledgement":"This research was supported by NSERC (RGPIN-04360-2014) and IST Austria. ","publisher":"Wiley-Blackwell","quality_controlled":"1","oa":1},{"_id":"1413","type":"journal_article","status":"public","project":[{"_id":"25357BD2-B435-11E9-9278-68D0E5697425","call_identifier":"FWF","name":"Deep Pictures: Creating Visual and Haptic Vector Images","grant_number":"P 24352-N23"}],"date_updated":"2021-01-12T06:50:34Z","citation":{"mla":"Jeschke, Stefan. “Generalized Diffusion Curves: An Improved Vector Representation for Smooth-Shaded Images.” Computer Graphics Forum, vol. 35, no. 2, Wiley-Blackwell, 2016, pp. 71–79, doi:10.1111/cgf.12812.","ama":"Jeschke S. Generalized diffusion curves: An improved vector representation for smooth-shaded images. Computer Graphics Forum. 2016;35(2):71-79. doi:10.1111/cgf.12812","apa":"Jeschke, S. (2016). Generalized diffusion curves: An improved vector representation for smooth-shaded images. Computer Graphics Forum. Wiley-Blackwell. https://doi.org/10.1111/cgf.12812","ieee":"S. Jeschke, “Generalized diffusion curves: An improved vector representation for smooth-shaded images,” Computer Graphics Forum, vol. 35, no. 2. Wiley-Blackwell, pp. 71–79, 2016.","short":"S. Jeschke, Computer Graphics Forum 35 (2016) 71–79.","chicago":"Jeschke, Stefan. “Generalized Diffusion Curves: An Improved Vector Representation for Smooth-Shaded Images.” Computer Graphics Forum. Wiley-Blackwell, 2016. https://doi.org/10.1111/cgf.12812.","ista":"Jeschke S. 2016. Generalized diffusion curves: An improved vector representation for smooth-shaded images. Computer Graphics Forum. 35(2), 71–79."},"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","publist_id":"5794","author":[{"full_name":"Jeschke, Stefan","last_name":"Jeschke","id":"44D6411A-F248-11E8-B48F-1D18A9856A87","first_name":"Stefan"}],"department":[{"_id":"ChWo"}],"title":"Generalized diffusion curves: An improved vector representation for smooth-shaded images","abstract":[{"lang":"eng","text":"This paper generalizes the well-known Diffusion Curves Images (DCI), which are composed of a set of Bezier curves with colors specified on either side. These colors are diffused as Laplace functions over the image domain, which results in smooth color gradients interrupted by the Bezier curves. Our new formulation allows for more color control away from the boundary, providing a similar expressive power as recent Bilaplace image models without introducing associated issues and computational costs. The new model is based on a special Laplace function blending and a new edge blur formulation. We demonstrate that given some user-defined boundary curves over an input raster image, fitting colors and edge blur from the image to the new model and subsequent editing and animation is equally convenient as with DCIs. Numerous examples and comparisons to DCIs are presented."}],"oa_version":"None","publisher":"Wiley-Blackwell","scopus_import":1,"quality_controlled":"1","intvolume":" 35","month":"05","year":"2016","publication_status":"published","publication":"Computer Graphics Forum","language":[{"iso":"eng"}],"day":"01","page":"71 - 79","date_created":"2018-12-11T11:51:53Z","volume":35,"doi":"10.1111/cgf.12812","issue":"2","date_published":"2016-05-01T00:00:00Z"},{"status":"public","pubrep_id":"611","type":"journal_article","_id":"1415","file_date_updated":"2020-07-14T12:44:53Z","department":[{"_id":"ChWo"}],"ddc":["000"],"date_updated":"2023-02-21T10:38:38Z","month":"05","intvolume":" 35","scopus_import":1,"oa_version":"Submitted Version","abstract":[{"lang":"eng","text":"The Fluid Implicit Particle method (FLIP) for liquid simulations uses particles to reduce numerical dissipation and provide important visual cues for events like complex splashes and small-scale features near the liquid surface. Unfortunately, FLIP simulations can be computationally expensive, because they require a dense sampling of particles to fill the entire liquid volume. Furthermore, the vast majority of these FLIP particles contribute nothing to the fluid's visual appearance, especially for larger volumes of liquid. We present a method that only uses FLIP particles within a narrow band of the liquid surface, while efficiently representing the remaining inner volume on a regular grid. We show that a naïve realization of this idea introduces unstable and uncontrollable energy fluctuations, and we propose a novel coupling scheme between FLIP particles and regular grid which overcomes this problem. Our method drastically reduces the particle count and simulation times while yielding results that are nearly indistinguishable from regular FLIP simulations. Our approach is easy to integrate into any existing FLIP implementation."}],"volume":35,"issue":"2","file":[{"file_id":"4940","checksum":"984afbe510ed48019025dff1dcc7baad","content_type":"application/pdf","access_level":"open_access","relation":"main_file","date_created":"2018-12-12T10:12:22Z","file_name":"IST-2016-611-v1+3_CW_nbflip_postprint_2016.pdf","date_updated":"2020-07-14T12:44:53Z","file_size":5938324,"creator":"system"}],"language":[{"iso":"eng"}],"publication_status":"published","title":"Narrow band FLIP for liquid simulations","author":[{"last_name":"Ferstl","full_name":"Ferstl, Florian","first_name":"Florian"},{"first_name":"Ryoichi","full_name":"Ando, Ryoichi","last_name":"Ando"},{"orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Westermann","full_name":"Westermann, Rüdiger","first_name":"Rüdiger"},{"last_name":"Thuerey","full_name":"Thuerey, Nils","first_name":"Nils"}],"publist_id":"5793","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","citation":{"ista":"Ferstl F, Ando R, Wojtan C, Westermann R, Thuerey N. 2016. Narrow band FLIP for liquid simulations. Computer Graphics Forum. 35(2), 225–232.","chicago":"Ferstl, Florian, Ryoichi Ando, Chris Wojtan, Rüdiger Westermann, and Nils Thuerey. “Narrow Band FLIP for Liquid Simulations.” Computer Graphics Forum. Wiley-Blackwell, 2016. https://doi.org/10.1111/cgf.12825.","apa":"Ferstl, F., Ando, R., Wojtan, C., Westermann, R., & Thuerey, N. (2016). Narrow band FLIP for liquid simulations. Computer Graphics Forum. Wiley-Blackwell. https://doi.org/10.1111/cgf.12825","ama":"Ferstl F, Ando R, Wojtan C, Westermann R, Thuerey N. Narrow band FLIP for liquid simulations. Computer Graphics Forum. 2016;35(2):225-232. doi:10.1111/cgf.12825","short":"F. Ferstl, R. Ando, C. Wojtan, R. Westermann, N. Thuerey, Computer Graphics Forum 35 (2016) 225–232.","ieee":"F. Ferstl, R. Ando, C. Wojtan, R. Westermann, and N. Thuerey, “Narrow band FLIP for liquid simulations,” Computer Graphics Forum, vol. 35, no. 2. Wiley-Blackwell, pp. 225–232, 2016.","mla":"Ferstl, Florian, et al. “Narrow Band FLIP for Liquid Simulations.” Computer Graphics Forum, vol. 35, no. 2, Wiley-Blackwell, 2016, pp. 225–32, doi:10.1111/cgf.12825."},"publisher":"Wiley-Blackwell","quality_controlled":"1","oa":1,"doi":"10.1111/cgf.12825","date_published":"2016-05-01T00:00:00Z","date_created":"2018-12-11T11:51:53Z","page":"225 - 232","day":"01","publication":"Computer Graphics Forum","has_accepted_license":"1","year":"2016"},{"month":"07","intvolume":" 35","alternative_title":["ACM Transactions on Graphics"],"oa_version":"Published Version","abstract":[{"lang":"eng","text":"We present a boundary element based method for fast simulation of brittle fracture. By introducing simplifying assumptions that allow us to quickly estimate stress intensities and opening displacements during crack propagation, we build a fracture algorithm where the cost of each time step scales linearly with the length of the crackfront. The transition from a full boundary element method to our faster variant is possible at the beginning of any time step. This allows us to build a hybrid method, which uses the expensive but more accurate BEM while the number of degrees of freedom is low, and uses the fast method once that number exceeds a given threshold as the crack geometry becomes more complicated. Furthermore, we integrate this fracture simulation with a standard rigid-body solver. Our rigid-body coupling solves a Neumann boundary value problem by carefully separating translational, rotational and deformational components of the collision forces and then applying a Tikhonov regularizer to the resulting linear system. We show that our method produces physically reasonable results in standard test cases and is capable of dealing with complex scenes faster than previous finite- or boundary element approaches."}],"issue":"4","related_material":{"record":[{"relation":"dissertation_contains","status":"public","id":"839"}]},"volume":35,"ec_funded":1,"file":[{"file_name":"IST-2016-632-v1+2_a104-hahn.pdf","date_created":"2018-12-12T10:15:04Z","file_size":12453704,"date_updated":"2020-07-14T12:44:46Z","creator":"system","file_id":"5121","checksum":"943712d9c9dc8bb5048d4adc561d7d38","content_type":"application/pdf","relation":"main_file","access_level":"open_access"}],"language":[{"iso":"eng"}],"publication_status":"published","status":"public","pubrep_id":"632","type":"conference","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"conference":{"name":"ACM SIGGRAPH","start_date":"2016-07-24","end_date":"2016-07-28","location":"Anaheim, CA, USA"},"_id":"1362","file_date_updated":"2020-07-14T12:44:46Z","department":[{"_id":"ChWo"}],"ddc":["000"],"date_updated":"2023-09-07T12:02:56Z","publisher":"ACM","quality_controlled":"1","oa":1,"date_published":"2016-07-01T00:00:00Z","doi":"10.1145/2897824.2925902","date_created":"2018-12-11T11:51:35Z","day":"01","has_accepted_license":"1","year":"2016","project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"article_number":"104","title":"Fast approximations for boundary element based brittle fracture simulation","publist_id":"5880","author":[{"first_name":"David","id":"357A6A66-F248-11E8-B48F-1D18A9856A87","last_name":"Hahn","full_name":"Hahn, David"},{"full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","citation":{"ieee":"D. Hahn and C. Wojtan, “Fast approximations for boundary element based brittle fracture simulation,” presented at the ACM SIGGRAPH, Anaheim, CA, USA, 2016, vol. 35, no. 4.","short":"D. Hahn, C. Wojtan, in:, ACM, 2016.","apa":"Hahn, D., & Wojtan, C. (2016). Fast approximations for boundary element based brittle fracture simulation (Vol. 35). Presented at the ACM SIGGRAPH, Anaheim, CA, USA: ACM. https://doi.org/10.1145/2897824.2925902","ama":"Hahn D, Wojtan C. Fast approximations for boundary element based brittle fracture simulation. In: Vol 35. ACM; 2016. doi:10.1145/2897824.2925902","mla":"Hahn, David, and Chris Wojtan. Fast Approximations for Boundary Element Based Brittle Fracture Simulation. Vol. 35, no. 4, 104, ACM, 2016, doi:10.1145/2897824.2925902.","ista":"Hahn D, Wojtan C. 2016. Fast approximations for boundary element based brittle fracture simulation. ACM SIGGRAPH, ACM Transactions on Graphics, vol. 35, 104.","chicago":"Hahn, David, and Chris Wojtan. “Fast Approximations for Boundary Element Based Brittle Fracture Simulation,” Vol. 35. ACM, 2016. https://doi.org/10.1145/2897824.2925902."}},{"acknowledgement":"First and foremost I would like to thank Chris. I have been incredibly lucky to have\r\nyou as my advisor. Your integrity and aspiration to do the right thing in all walks of\r\nlife is something I admire and aspire to. I also really appreciate the fact that when\r\nworking with you it felt like we were equals. I think we had a very synergetic work\r\nrelationship: I learned immensely from you, but I dare say that you learned a few\r\nthings from me as well. ;)\r\nNext, I would like to thank my amazing committee. Hao, it was a fantastic\r\nexperience working with you. You showed me how to persevere and keep morale\r\nhigh when things were looking the most bleak before the deadline. You are an\r\nincredible motivator and super fun to be around! Vladimir, thanks for the shared\r\nlunches and the poker games. Sorry for not bringing them back when I got busy.\r\nAlso, sorry for embarrassing you by asking about your guitar playing that one\r\ntime. You really are quite awesome! Nils, one of the friendliest and most humble\r\npeople you will meet and a top notch researcher to boot! Thank you for joining\r\nmy committee late!\r\nI would also like to acknowledge the Visual Computing group at IST Austria\r\nfrom whom I have learned so much. The excellent discussions we had in reading\r\ngroups and research meetings really helped me become a better researcher!\r\nNext, I would like to thank all the amazing people that I met during my PhD\r\nstudies, both at IST Austria, in Vienna and elsewhere. ","publisher":"Institute of Science and Technology Austria","oa":1,"day":"15","has_accepted_license":"1","year":"2016","date_published":"2016-07-15T00:00:00Z","doi":"10.15479/AT:ISTA:th_640","date_created":"2018-12-11T11:50:16Z","page":"114","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","citation":{"ieee":"M. Bojsen-Hansen, “Tracking, correcting and absorbing water surface waves,” Institute of Science and Technology Austria, 2016.","short":"M. Bojsen-Hansen, Tracking, Correcting and Absorbing Water Surface Waves, Institute of Science and Technology Austria, 2016.","apa":"Bojsen-Hansen, M. (2016). Tracking, correcting and absorbing water surface waves. Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:th_640","ama":"Bojsen-Hansen M. Tracking, correcting and absorbing water surface waves. 2016. doi:10.15479/AT:ISTA:th_640","mla":"Bojsen-Hansen, Morten. Tracking, Correcting and Absorbing Water Surface Waves. Institute of Science and Technology Austria, 2016, doi:10.15479/AT:ISTA:th_640.","ista":"Bojsen-Hansen M. 2016. Tracking, correcting and absorbing water surface waves. Institute of Science and Technology Austria.","chicago":"Bojsen-Hansen, Morten. “Tracking, Correcting and Absorbing Water Surface Waves.” Institute of Science and Technology Austria, 2016. https://doi.org/10.15479/AT:ISTA:th_640."},"title":"Tracking, correcting and absorbing water surface waves","publist_id":"6238","author":[{"first_name":"Morten","id":"439F0C8C-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-4417-3224","full_name":"Bojsen-Hansen, Morten","last_name":"Bojsen-Hansen"}],"article_processing_charge":"No","oa_version":"Published Version","abstract":[{"text":"Computer graphics is an extremely exciting field for two reasons. On the one hand,\r\nthere is a healthy injection of pragmatism coming from the visual effects industry\r\nthat want robust algorithms that work so they can produce results at an increasingly\r\nfrantic pace. On the other hand, they must always try to push the envelope and\r\nachieve the impossible to wow their audiences in the next blockbuster, which means\r\nthat the industry has not succumb to conservatism, and there is plenty of room to\r\ntry out new and crazy ideas if there is a chance that it will pan into something\r\nuseful.\r\nWater simulation has been in visual effects for decades, however it still remains\r\nextremely challenging because of its high computational cost and difficult artdirectability.\r\nThe work in this thesis tries to address some of these difficulties.\r\nSpecifically, we make the following three novel contributions to the state-of-the-art\r\nin water simulation for visual effects.\r\nFirst, we develop the first algorithm that can convert any sequence of closed\r\nsurfaces in time into a moving triangle mesh. State-of-the-art methods at the time\r\ncould only handle surfaces with fixed connectivity, but we are the first to be able to\r\nhandle surfaces that merge and split apart. This is important for water simulation\r\npractitioners, because it allows them to convert splashy water surfaces extracted\r\nfrom particles or simulated using grid-based level sets into triangle meshes that can\r\nbe either textured and enhanced with extra surface dynamics as a post-process.\r\nWe also apply our algorithm to other phenomena that merge and split apart, such\r\nas morphs and noisy reconstructions of human performances.\r\nSecond, we formulate a surface-based energy that measures the deviation of a\r\nwater surface froma physically valid state. Such discrepancies arise when there is a\r\nmismatch in the degrees of freedom between the water surface and the underlying\r\nphysics solver. This commonly happens when practitioners use a moving triangle\r\nmesh with a grid-based physics solver, or when high-resolution grid-based surfaces\r\nare combined with low-resolution physics. Following the direction of steepest\r\ndescent on our surface-based energy, we can either smooth these artifacts or turn\r\nthem into high-resolution waves by interpreting the energy as a physical potential.\r\nThird, we extend state-of-the-art techniques in non-reflecting boundaries to handle spatially and time-varying background flows. This allows a novel new\r\nworkflow where practitioners can re-simulate part of an existing simulation, such\r\nas removing a solid obstacle, adding a new splash or locally changing the resolution.\r\nSuch changes can easily lead to new waves in the re-simulated region that would\r\nreflect off of the new simulation boundary, effectively ruining the illusion of a\r\nseamless simulation boundary between the existing and new simulations. Our\r\nnon-reflecting boundaries makes sure that such waves are absorbed.","lang":"eng"}],"month":"07","alternative_title":["ISTA Thesis"],"file":[{"relation":"main_file","access_level":"open_access","content_type":"application/pdf","file_id":"4982","creator":"system","file_size":13869345,"date_updated":"2018-12-12T10:13:02Z","file_name":"IST-2016-640-v1+1_2016_Bojsen-Hansen_TCaAWSW.pdf","date_created":"2018-12-12T10:13:02Z"}],"language":[{"iso":"eng"}],"publication_identifier":{"issn":["2663-337X"]},"publication_status":"published","degree_awarded":"PhD","related_material":{"record":[{"id":"5558","status":"public","relation":"other"}]},"_id":"1122","status":"public","type":"dissertation","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"ddc":["004","005","006","532","621"],"supervisor":[{"full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"date_updated":"2024-02-21T13:50:48Z","department":[{"_id":"ChWo"}],"file_date_updated":"2018-12-12T10:13:02Z"},{"_id":"5558","status":"public","pubrep_id":"640","type":"research_data","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","ddc":["004"],"citation":{"ama":"Bojsen-Hansen M. Tracking, Correcting and Absorbing Water Surface Waves. 2016. doi:10.15479/AT:ISTA:48","apa":"Bojsen-Hansen, M. (2016). Tracking, Correcting and Absorbing Water Surface Waves. Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:48","short":"M. Bojsen-Hansen, (2016).","ieee":"M. Bojsen-Hansen, “Tracking, Correcting and Absorbing Water Surface Waves.” Institute of Science and Technology Austria, 2016.","mla":"Bojsen-Hansen, Morten. Tracking, Correcting and Absorbing Water Surface Waves. Institute of Science and Technology Austria, 2016, doi:10.15479/AT:ISTA:48.","ista":"Bojsen-Hansen M. 2016. Tracking, Correcting and Absorbing Water Surface Waves, Institute of Science and Technology Austria, 10.15479/AT:ISTA:48.","chicago":"Bojsen-Hansen, Morten. “Tracking, Correcting and Absorbing Water Surface Waves.” Institute of Science and Technology Austria, 2016. https://doi.org/10.15479/AT:ISTA:48."},"date_updated":"2024-02-21T13:50:48Z","title":"Tracking, Correcting and Absorbing Water Surface Waves","file_date_updated":"2020-07-14T12:47:02Z","department":[{"_id":"ChWo"}],"author":[{"last_name":"Bojsen-Hansen","orcid":"0000-0002-4417-3224","full_name":"Bojsen-Hansen, Morten","first_name":"Morten","id":"439F0C8C-F248-11E8-B48F-1D18A9856A87"}],"publist_id":"6238","article_processing_charge":"No","oa_version":"Published Version","abstract":[{"text":"PhD thesis LaTeX source code","lang":"eng"}],"month":"09","publisher":"Institute of Science and Technology Austria","oa":1,"day":"23","file":[{"date_created":"2018-12-12T13:02:18Z","file_name":"IST-2016-48-v1+1_2016_Bojsen-Hansen_TCaAWSW.tar.bz2","date_updated":"2020-07-14T12:47:02Z","file_size":55237885,"creator":"system","checksum":"5b1b256ad796fbddb4b7729f5e45e444","file_id":"5589","content_type":"application/x-bzip2","access_level":"open_access","relation":"main_file"}],"has_accepted_license":"1","datarep_id":"48","year":"2016","doi":"10.15479/AT:ISTA:48","related_material":{"record":[{"relation":"other","id":"1122","status":"public"}]},"date_published":"2016-09-23T00:00:00Z","date_created":"2018-12-12T12:31:31Z"},{"abstract":[{"lang":"eng","text":"Simulating the delightful dynamics of soap films, bubbles, and foams has traditionally required the use of a fully three-dimensional many-phase Navier-Stokes solver, even though their visual appearance is completely dominated by the thin liquid surface. We depart from earlier work on soap bubbles and foams by noting that their dynamics are naturally described by a Lagrangian vortex sheet model in which circulation is the primary variable. This leads us to derive a novel circulation-preserving surface-only discretization of foam dynamics driven by surface tension on a non-manifold triangle mesh. We represent the surface using a mesh-based multimaterial surface tracker which supports complex bubble topology changes, and evolve the surface according to the ambient air flow induced by a scalar circulation field stored on the mesh. Surface tension forces give rise to a simple update rule for circulation, even at non-manifold Plateau borders, based on a discrete measure of signed scalar mean curvature. We further incorporate vertex constraints to enable the interaction of soap films with wires. The result is a method that is at once simple, robust, and efficient, yet able to capture an array of soap films behaviors including foam rearrangement, catenoid collapse, blowing bubbles, and double bubbles being pulled apart."}],"oa_version":"Submitted Version","scopus_import":1,"intvolume":" 34","month":"07","publication_status":"published","language":[{"iso":"eng"}],"file":[{"checksum":"57b07d78d2d612a8052744b37d4a71fa","file_id":"4867","content_type":"application/pdf","relation":"main_file","access_level":"open_access","file_name":"IST-2016-608-v1+1_doublebubbles.pdf","date_created":"2018-12-12T10:11:14Z","file_size":8973215,"date_updated":"2020-07-14T12:45:07Z","creator":"system"}],"ec_funded":1,"issue":"4","volume":34,"_id":"1634","conference":{"name":"SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques","location":"Los Angeles, CA, United States","end_date":"2015-08-13","start_date":"2015-08-09"},"type":"conference","pubrep_id":"608","status":"public","date_updated":"2023-02-23T10:07:42Z","ddc":["000"],"file_date_updated":"2020-07-14T12:45:07Z","department":[{"_id":"ChWo"}],"oa":1,"quality_controlled":"1","publisher":"ACM","year":"2015","has_accepted_license":"1","day":"27","date_created":"2018-12-11T11:53:09Z","doi":"10.1145/2767003","date_published":"2015-07-27T00:00:00Z","article_number":"149","project":[{"call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"}],"citation":{"mla":"Da, Fang, et al. Double Bubbles sans Toil and Trouble: Discrete Circulation-Preserving Vortex Sheets for Soap Films and Foams. Vol. 34, no. 4, 149, ACM, 2015, doi:10.1145/2767003.","apa":"Da, F., Batty, C., Wojtan, C., & Grinspun, E. (2015). Double bubbles sans toil and trouble: discrete circulation-preserving vortex sheets for soap films and foams (Vol. 34). Presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Los Angeles, CA, United States: ACM. https://doi.org/10.1145/2767003","ama":"Da F, Batty C, Wojtan C, Grinspun E. Double bubbles sans toil and trouble: discrete circulation-preserving vortex sheets for soap films and foams. In: Vol 34. ACM; 2015. doi:10.1145/2767003","ieee":"F. Da, C. Batty, C. Wojtan, and E. Grinspun, “Double bubbles sans toil and trouble: discrete circulation-preserving vortex sheets for soap films and foams,” presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Los Angeles, CA, United States, 2015, vol. 34, no. 4.","short":"F. Da, C. Batty, C. Wojtan, E. Grinspun, in:, ACM, 2015.","chicago":"Da, Fang, Christopher Batty, Chris Wojtan, and Eitan Grinspun. “Double Bubbles sans Toil and Trouble: Discrete Circulation-Preserving Vortex Sheets for Soap Films and Foams,” Vol. 34. ACM, 2015. https://doi.org/10.1145/2767003.","ista":"Da F, Batty C, Wojtan C, Grinspun E. 2015. Double bubbles sans toil and trouble: discrete circulation-preserving vortex sheets for soap films and foams. SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques vol. 34, 149."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"first_name":"Fang","last_name":"Da","full_name":"Da, Fang"},{"last_name":"Batty","full_name":"Batty, Christopher","first_name":"Christopher"},{"first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan"},{"full_name":"Grinspun, Eitan","last_name":"Grinspun","first_name":"Eitan"}],"publist_id":"5521","title":"Double bubbles sans toil and trouble: discrete circulation-preserving vortex sheets for soap films and foams"},{"article_number":"53","citation":{"chicago":"Ando, Ryoichi, Nils Thuerey, and Chris Wojtan. “A Stream Function Solver for Liquid Simulations,” Vol. 34. ACM, 2015. https://doi.org/10.1145/2766935.","ista":"Ando R, Thuerey N, Wojtan C. 2015. A stream function solver for liquid simulations. SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, ACM Transactions on Graphics, vol. 34, 53.","mla":"Ando, Ryoichi, et al. A Stream Function Solver for Liquid Simulations. Vol. 34, no. 4, 53, ACM, 2015, doi:10.1145/2766935.","short":"R. Ando, N. Thuerey, C. Wojtan, in:, ACM, 2015.","ieee":"R. Ando, N. Thuerey, and C. Wojtan, “A stream function solver for liquid simulations,” presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Los Angeles, CA, USA, 2015, vol. 34, no. 4.","apa":"Ando, R., Thuerey, N., & Wojtan, C. (2015). A stream function solver for liquid simulations (Vol. 34). Presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Los Angeles, CA, USA: ACM. https://doi.org/10.1145/2766935","ama":"Ando R, Thuerey N, Wojtan C. A stream function solver for liquid simulations. In: Vol 34. ACM; 2015. doi:10.1145/2766935"},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publist_id":"5523","author":[{"full_name":"Ando, Ryoichi","last_name":"Ando","first_name":"Ryoichi"},{"first_name":"Nils","last_name":"Thuerey","full_name":"Thuerey, Nils"},{"last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"title":"A stream function solver for liquid simulations","acknowledgement":"The first author was supported by a JSPS Postdoctoral Fellowship for Research Abroad. This work was also supported by the ERC projects ERC-2014-StG-637014 realFlow and ERC-2014- StG-638176 BigSplash.","quality_controlled":"1","publisher":"ACM","oa":1,"has_accepted_license":"1","year":"2015","day":"27","date_published":"2015-07-27T00:00:00Z","doi":"10.1145/2766935","date_created":"2018-12-11T11:53:09Z","_id":"1632","type":"conference","conference":{"start_date":"2015-08-09","end_date":"2015-08-13","location":"Los Angeles, CA, USA","name":"SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques"},"status":"public","pubrep_id":"610","date_updated":"2023-02-23T10:07:37Z","ddc":["000"],"file_date_updated":"2020-07-14T12:45:07Z","department":[{"_id":"ChWo"}],"abstract":[{"text":"This paper presents a liquid simulation technique that enforces the incompressibility condition using a stream function solve instead of a pressure projection. Previous methods have used stream function techniques for the simulation of detailed single-phase flows, but a formulation for liquid simulation has proved elusive in part due to the free surface boundary conditions. In this paper, we introduce a stream function approach to liquid simulations with novel boundary conditions for free surfaces, solid obstacles, and solid-fluid coupling.\r\n\r\nAlthough our approach increases the dimension of the linear system necessary to enforce incompressibility, it provides interesting and surprising benefits. First, the resulting flow is guaranteed to be divergence-free regardless of the accuracy of the solve. Second, our free-surface boundary conditions guarantee divergence-free motion even in the un-simulated air phase, which enables two-phase flow simulation by only computing a single phase. We implemented this method using a variant of FLIP simulation which only samples particles within a narrow band of the liquid surface, and we illustrate the effectiveness of our method for detailed two-phase flow simulations with complex boundaries, detailed bubble interactions, and two-way solid-fluid coupling.","lang":"eng"}],"oa_version":"Submitted Version","scopus_import":1,"alternative_title":["ACM Transactions on Graphics"],"month":"07","intvolume":" 34","publication_status":"published","file":[{"date_updated":"2020-07-14T12:45:07Z","file_size":21831121,"creator":"system","date_created":"2018-12-12T10:11:52Z","file_name":"IST-2016-610-v1+1_vecpotential.pdf","content_type":"application/pdf","access_level":"open_access","relation":"main_file","checksum":"7a9afdfaba9209157ce19376e15bc90b","file_id":"4909"}],"language":[{"iso":"eng"}],"volume":34,"issue":"4"},{"intvolume":" 34","month":"07","scopus_import":1,"oa_version":"Submitted Version","abstract":[{"lang":"eng","text":"We present a method to learn and propagate shape placements in 2D polygonal scenes from a few examples provided by a user. The placement of a shape is modeled as an oriented bounding box. Simple geometric relationships between this bounding box and nearby scene polygons define a feature set for the placement. The feature sets of all example placements are then used to learn a probabilistic model over all possible placements and scenes. With this model, we can generate a new set of placements with similar geometric relationships in any given scene. We introduce extensions that enable propagation and generation of shapes in 3D scenes, as well as the application of a learned modeling session to large scenes without additional user interaction. These concepts allow us to generate complex scenes with thousands of objects with relatively little user interaction."}],"issue":"4","volume":34,"language":[{"iso":"eng"}],"file":[{"checksum":"8b05a51e372c9b0b5af9a00098a9538b","file_id":"4647","content_type":"application/pdf","access_level":"open_access","relation":"main_file","date_created":"2018-12-12T10:07:49Z","file_name":"IST-2016-576-v1+1_guerrero-2015-lsp-paper.pdf","date_updated":"2020-07-14T12:45:07Z","file_size":11902290,"creator":"system"}],"publication_status":"published","pubrep_id":"576","status":"public","conference":{"name":"SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques","location":"Los Angeles, CA, United States","end_date":"2015-08-13","start_date":"2015-08-09"},"type":"conference","_id":"1630","file_date_updated":"2020-07-14T12:45:07Z","department":[{"_id":"ChWo"}],"ddc":["000"],"date_updated":"2021-01-12T06:52:07Z","oa":1,"publisher":"ACM","quality_controlled":"1","acknowledgement":"This publication is based upon work supported by the KAUST Office of Competitive Research Funds (OCRF) under Award No. 62140401, the KAUST Visual Computing Center and the Austrian Science Fund (FWF) projects DEEP PICTURES (no. P24352-N23) and Data-Driven Procedural Modeling of Interiors (no. P24600-N23).","date_created":"2018-12-11T11:53:08Z","date_published":"2015-07-27T00:00:00Z","doi":"10.1145/2766933","day":"27","year":"2015","has_accepted_license":"1","project":[{"grant_number":"P 24352-N23","name":"Deep Pictures: Creating Visual and Haptic Vector Images","_id":"25357BD2-B435-11E9-9278-68D0E5697425","call_identifier":"FWF"}],"article_number":"108","title":"Learning shape placements by example","author":[{"first_name":"Paul","last_name":"Guerrero","full_name":"Guerrero, Paul"},{"full_name":"Jeschke, Stefan","last_name":"Jeschke","first_name":"Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Wimmer","full_name":"Wimmer, Michael","first_name":"Michael"},{"first_name":"Peter","full_name":"Wonka, Peter","last_name":"Wonka"}],"publist_id":"5525","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"chicago":"Guerrero, Paul, Stefan Jeschke, Michael Wimmer, and Peter Wonka. “Learning Shape Placements by Example,” Vol. 34. ACM, 2015. https://doi.org/10.1145/2766933.","ista":"Guerrero P, Jeschke S, Wimmer M, Wonka P. 2015. Learning shape placements by example. SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques vol. 34, 108.","mla":"Guerrero, Paul, et al. Learning Shape Placements by Example. Vol. 34, no. 4, 108, ACM, 2015, doi:10.1145/2766933.","ieee":"P. Guerrero, S. Jeschke, M. Wimmer, and P. Wonka, “Learning shape placements by example,” presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Los Angeles, CA, United States, 2015, vol. 34, no. 4.","short":"P. Guerrero, S. Jeschke, M. Wimmer, P. Wonka, in:, ACM, 2015.","apa":"Guerrero, P., Jeschke, S., Wimmer, M., & Wonka, P. (2015). Learning shape placements by example (Vol. 34). Presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Los Angeles, CA, United States: ACM. https://doi.org/10.1145/2766933","ama":"Guerrero P, Jeschke S, Wimmer M, Wonka P. Learning shape placements by example. In: Vol 34. ACM; 2015. doi:10.1145/2766933"}},{"issue":"2","volume":34,"publication_status":"published","language":[{"iso":"eng"}],"file":[{"file_name":"IST-2016-607-v1+1_coarsegrid.pdf","date_created":"2018-12-12T10:16:30Z","file_size":6312352,"date_updated":"2020-07-14T12:45:15Z","creator":"system","checksum":"590752bf977855b337a80f78a9bc2404","file_id":"5218","content_type":"application/pdf","relation":"main_file","access_level":"open_access"}],"scopus_import":1,"intvolume":" 34","month":"05","abstract":[{"text":"This work presents a method for efficiently simplifying the pressure projection step in a liquid simulation. We first devise a straightforward dimension reduction technique that dramatically reduces the cost of solving the pressure projection. Next, we introduce a novel change of basis that satisfies free-surface boundary conditions exactly, regardless of the accuracy of the pressure solve. When combined, these ideas greatly reduce the computational complexity of the pressure solve without compromising free surface boundary conditions at the highest level of detail. Our techniques are easy to parallelize, and they effectively eliminate the computational bottleneck for large liquid simulations.","lang":"eng"}],"oa_version":"Submitted Version","file_date_updated":"2020-07-14T12:45:15Z","department":[{"_id":"ChWo"}],"date_updated":"2023-02-23T10:12:11Z","ddc":["000"],"type":"journal_article","pubrep_id":"607","status":"public","_id":"1735","page":"473 - 480","date_created":"2018-12-11T11:53:44Z","date_published":"2015-05-01T00:00:00Z","doi":"10.1111/cgf.12576","year":"2015","has_accepted_license":"1","publication":"Computer Graphics Forum","day":"01","oa":1,"publisher":"Wiley","quality_controlled":"1","acknowledgement":"The first author was supported by a JSPS Postdoctoral Fellowship for Research Abroad","author":[{"first_name":"Ryoichi","last_name":"Ando","full_name":"Ando, Ryoichi"},{"last_name":"Thürey","full_name":"Thürey, Nils","first_name":"Nils"},{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546"}],"publist_id":"5389","title":"A dimension-reduced pressure solver for liquid simulations","citation":{"mla":"Ando, Ryoichi, et al. “A Dimension-Reduced Pressure Solver for Liquid Simulations.” Computer Graphics Forum, vol. 34, no. 2, Wiley, 2015, pp. 473–80, doi:10.1111/cgf.12576.","ama":"Ando R, Thürey N, Wojtan C. A dimension-reduced pressure solver for liquid simulations. Computer Graphics Forum. 2015;34(2):473-480. doi:10.1111/cgf.12576","apa":"Ando, R., Thürey, N., & Wojtan, C. (2015). A dimension-reduced pressure solver for liquid simulations. Computer Graphics Forum. Wiley. https://doi.org/10.1111/cgf.12576","ieee":"R. Ando, N. Thürey, and C. Wojtan, “A dimension-reduced pressure solver for liquid simulations,” Computer Graphics Forum, vol. 34, no. 2. Wiley, pp. 473–480, 2015.","short":"R. Ando, N. Thürey, C. Wojtan, Computer Graphics Forum 34 (2015) 473–480.","chicago":"Ando, Ryoichi, Nils Thürey, and Chris Wojtan. “A Dimension-Reduced Pressure Solver for Liquid Simulations.” Computer Graphics Forum. Wiley, 2015. https://doi.org/10.1111/cgf.12576.","ista":"Ando R, Thürey N, Wojtan C. 2015. A dimension-reduced pressure solver for liquid simulations. Computer Graphics Forum. 34(2), 473–480."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87"},{"_id":"1814","type":"journal_article","pubrep_id":"575","status":"public","date_updated":"2023-02-23T10:15:40Z","ddc":["000"],"file_date_updated":"2020-07-14T12:45:17Z","department":[{"_id":"ChWo"}],"abstract":[{"lang":"eng","text":"We present an efficient wavefront tracking algorithm for animating bodies of water that interact with their environment. Our contributions include: a novel wavefront tracking technique that enables dispersion, refraction, reflection, and diffraction in the same simulation; a unique multivalued function interpolation method that enables our simulations to elegantly sidestep the Nyquist limit; a dispersion approximation for efficiently amplifying the number of simulated waves by several orders of magnitude; and additional extensions that allow for time-dependent effects and interactive artistic editing of the resulting animation. Our contributions combine to give us multitudes more wave details than similar algorithms, while maintaining high frame rates and allowing close camera zooms."}],"oa_version":"Submitted Version","scopus_import":1,"intvolume":" 34","month":"04","publication_status":"published","language":[{"iso":"eng"}],"file":[{"content_type":"application/pdf","access_level":"open_access","relation":"main_file","checksum":"67c9f4fa370def68cdf31299e48bc91f","file_id":"4933","date_updated":"2020-07-14T12:45:17Z","file_size":23712153,"creator":"system","date_created":"2018-12-12T10:12:15Z","file_name":"IST-2016-575-v1+1_wavefront_preprint.pdf"}],"ec_funded":1,"volume":34,"issue":"3","article_number":"27","project":[{"_id":"25357BD2-B435-11E9-9278-68D0E5697425","call_identifier":"FWF","grant_number":"P 24352-N23","name":"Deep Pictures: Creating Visual and Haptic Vector Images"},{"call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176"}],"citation":{"mla":"Jeschke, Stefan, and Chris Wojtan. “Water Wave Animation via Wavefront Parameter Interpolation.” ACM Transactions on Graphics, vol. 34, no. 3, 27, ACM, 2015, doi:10.1145/2714572.","ama":"Jeschke S, Wojtan C. Water wave animation via wavefront parameter interpolation. ACM Transactions on Graphics. 2015;34(3). doi:10.1145/2714572","apa":"Jeschke, S., & Wojtan, C. (2015). Water wave animation via wavefront parameter interpolation. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/2714572","short":"S. Jeschke, C. Wojtan, ACM Transactions on Graphics 34 (2015).","ieee":"S. Jeschke and C. Wojtan, “Water wave animation via wavefront parameter interpolation,” ACM Transactions on Graphics, vol. 34, no. 3. ACM, 2015.","chicago":"Jeschke, Stefan, and Chris Wojtan. “Water Wave Animation via Wavefront Parameter Interpolation.” ACM Transactions on Graphics. ACM, 2015. https://doi.org/10.1145/2714572.","ista":"Jeschke S, Wojtan C. 2015. Water wave animation via wavefront parameter interpolation. ACM Transactions on Graphics. 34(3), 27."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"full_name":"Jeschke, Stefan","last_name":"Jeschke","first_name":"Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J"}],"publist_id":"5292","title":"Water wave animation via wavefront parameter interpolation","oa":1,"publisher":"ACM","quality_controlled":"1","year":"2015","has_accepted_license":"1","publication":"ACM Transactions on Graphics","day":"01","date_created":"2018-12-11T11:54:09Z","doi":"10.1145/2714572","date_published":"2015-04-01T00:00:00Z"},{"ddc":["000"],"date_updated":"2023-09-07T12:02:56Z","file_date_updated":"2020-07-14T12:45:07Z","department":[{"_id":"ChWo"}],"_id":"1633","pubrep_id":"609","status":"public","conference":{"name":"SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques","location":"Los Angeles, CA, United States","end_date":"2015-08-13","start_date":"2015-08-09"},"type":"conference","language":[{"iso":"eng"}],"file":[{"access_level":"open_access","relation":"main_file","content_type":"application/pdf","checksum":"955aee971983f6b6152bcc1c9b4a7c20","file_id":"5131","creator":"system","date_updated":"2020-07-14T12:45:07Z","file_size":20154270,"date_created":"2018-12-12T10:15:13Z","file_name":"IST-2016-609-v1+1_FractureBEM.pdf"}],"publication_status":"published","ec_funded":1,"volume":34,"related_material":{"record":[{"relation":"dissertation_contains","id":"839","status":"public"}]},"issue":"4","oa_version":"Submitted Version","abstract":[{"lang":"eng","text":"We present a method for simulating brittle fracture under the assumptions of quasi-static linear elastic fracture mechanics (LEFM). Using the boundary element method (BEM) and Lagrangian crack-fronts, we produce highly detailed fracture surfaces. The computational cost of the BEM is alleviated by using a low-resolution mesh and interpolating the resulting stress intensity factors when propagating the high-resolution crack-front.\r\n\r\nOur system produces physics-based fracture surfaces with high spatial and temporal resolution, taking spatial variation of material toughness and/or strength into account. It also allows for crack initiation to be handled separately from crack propagation, which is not only more reasonable from a physics perspective, but can also be used to control the simulation.\r\n\r\nSeparating the resolution of the crack-front from the resolution of the computational mesh increases the efficiency and therefore the amount of visual detail on the resulting fracture surfaces. The BEM also allows us to re-use previously computed blocks of the system matrix."}],"intvolume":" 34","month":"07","scopus_import":1,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"ista":"Hahn D, Wojtan C. 2015. High-resolution brittle fracture simulation with boundary elements. SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques vol. 34, 151.","chicago":"Hahn, David, and Chris Wojtan. “High-Resolution Brittle Fracture Simulation with Boundary Elements,” Vol. 34. ACM, 2015. https://doi.org/10.1145/2766896.","ieee":"D. Hahn and C. Wojtan, “High-resolution brittle fracture simulation with boundary elements,” presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Los Angeles, CA, United States, 2015, vol. 34, no. 4.","short":"D. Hahn, C. Wojtan, in:, ACM, 2015.","apa":"Hahn, D., & Wojtan, C. (2015). High-resolution brittle fracture simulation with boundary elements (Vol. 34). Presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Los Angeles, CA, United States: ACM. https://doi.org/10.1145/2766896","ama":"Hahn D, Wojtan C. High-resolution brittle fracture simulation with boundary elements. In: Vol 34. ACM; 2015. doi:10.1145/2766896","mla":"Hahn, David, and Chris Wojtan. High-Resolution Brittle Fracture Simulation with Boundary Elements. Vol. 34, no. 4, 151, ACM, 2015, doi:10.1145/2766896."},"title":"High-resolution brittle fracture simulation with boundary elements","author":[{"id":"357A6A66-F248-11E8-B48F-1D18A9856A87","first_name":"David","last_name":"Hahn","full_name":"Hahn, David"},{"last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"publist_id":"5522","article_number":"151","project":[{"call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"}],"day":"27","year":"2015","has_accepted_license":"1","date_created":"2018-12-11T11:53:09Z","doi":"10.1145/2766896","date_published":"2015-07-27T00:00:00Z","oa":1,"publisher":"ACM","quality_controlled":"1"},{"oa":1,"quality_controlled":"1","publisher":"ACM","date_created":"2018-12-11T11:53:08Z","doi":"10.1145/2591010","date_published":"2014-03-01T00:00:00Z","publication":"ACM Transactions on Graphics","day":"01","year":"2014","has_accepted_license":"1","article_number":"15","title":"Edit propagation using geometric relationship functions","publist_id":"5526","author":[{"full_name":"Guerrero, Paul","last_name":"Guerrero","first_name":"Paul"},{"full_name":"Jeschke, Stefan","last_name":"Jeschke","id":"44D6411A-F248-11E8-B48F-1D18A9856A87","first_name":"Stefan"},{"first_name":"Michael","last_name":"Wimmer","full_name":"Wimmer, Michael"},{"full_name":"Wonka, Peter","last_name":"Wonka","first_name":"Peter"}],"user_id":"4435EBFC-F248-11E8-B48F-1D18A9856A87","citation":{"ista":"Guerrero P, Jeschke S, Wimmer M, Wonka P. 2014. Edit propagation using geometric relationship functions. ACM Transactions on Graphics. 33(2), 15.","chicago":"Guerrero, Paul, Stefan Jeschke, Michael Wimmer, and Peter Wonka. “Edit Propagation Using Geometric Relationship Functions.” ACM Transactions on Graphics. ACM, 2014. https://doi.org/10.1145/2591010.","ama":"Guerrero P, Jeschke S, Wimmer M, Wonka P. Edit propagation using geometric relationship functions. ACM Transactions on Graphics. 2014;33(2). doi:10.1145/2591010","apa":"Guerrero, P., Jeschke, S., Wimmer, M., & Wonka, P. (2014). Edit propagation using geometric relationship functions. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/2591010","short":"P. Guerrero, S. Jeschke, M. Wimmer, P. Wonka, ACM Transactions on Graphics 33 (2014).","ieee":"P. Guerrero, S. Jeschke, M. Wimmer, and P. Wonka, “Edit propagation using geometric relationship functions,” ACM Transactions on Graphics, vol. 33, no. 2. ACM, 2014.","mla":"Guerrero, Paul, et al. “Edit Propagation Using Geometric Relationship Functions.” ACM Transactions on Graphics, vol. 33, no. 2, 15, ACM, 2014, doi:10.1145/2591010."},"intvolume":" 33","month":"03","oa_version":"Submitted Version","abstract":[{"text":"We propose a method for propagating edit operations in 2D vector graphics, based on geometric relationship functions. These functions quantify the geometric relationship of a point to a polygon, such as the distance to the boundary or the direction to the closest corner vertex. The level sets of the relationship functions describe points with the same relationship to a polygon. For a given query point, we first determine a set of relationships to local features, construct all level sets for these relationships, and accumulate them. The maxima of the resulting distribution are points with similar geometric relationships. We show extensions to handle mirror symmetries, and discuss the use of relationship functions as local coordinate systems. Our method can be applied, for example, to interactive floorplan editing, and it is especially useful for large layouts, where individual edits would be cumbersome. We demonstrate populating 2D layouts with tens to hundreds of objects by propagating relatively few edit operations.","lang":"eng"}],"volume":33,"issue":"2","language":[{"iso":"eng"}],"file":[{"file_name":"IST-2016-577-v1+1_2014.TOG.Paul.EditingPropagation.final.pdf","date_created":"2018-12-12T10:11:22Z","creator":"system","file_size":9832561,"date_updated":"2020-07-14T12:45:07Z","checksum":"7f91e588a4e888610313b98271e6418e","file_id":"4876","relation":"main_file","access_level":"open_access","content_type":"application/pdf"}],"publication_status":"published","pubrep_id":"577","status":"public","type":"journal_article","_id":"1629","file_date_updated":"2020-07-14T12:45:07Z","department":[{"_id":"ChWo"}],"ddc":["000"],"date_updated":"2021-01-12T06:52:06Z"},{"language":[{"iso":"eng"}],"file":[{"file_id":"5182","checksum":"91946bfc509c77f5fd3151a3ff2b2c8f","access_level":"open_access","relation":"main_file","content_type":"application/pdf","date_created":"2018-12-12T10:15:58Z","file_name":"IST-2016-574-v1+1_Guerrero-2014-TPS-paper.pdf","creator":"system","date_updated":"2020-07-14T12:45:19Z","file_size":24817484}],"publication_status":"published","issue":"1","volume":34,"oa_version":"Submitted Version","abstract":[{"text":"In this paper, we present a method for non-rigid, partial shape matching in vector graphics. Given a user-specified query region in a 2D shape, similar regions are found, even if they are non-linearly distorted. Furthermore, a non-linear mapping is established between the query regions and these matches, which allows the automatic transfer of editing operations such as texturing. This is achieved by a two-step approach. First, pointwise correspondences between the query region and the whole shape are established. The transformation parameters of these correspondences are registered in an appropriate transformation space. For transformations between similar regions, these parameters form surfaces in transformation space, which are extracted in the second step of our method. The extracted regions may be related to the query region by a non-rigid transform, enabling non-rigid shape matching. In this paper, we present a method for non-rigid, partial shape matching in vector graphics. Given a user-specified query region in a 2D shape, similar regions are found, even if they are non-linearly distorted. Furthermore, a non-linear mapping is established between the query regions and these matches, which allows the automatic transfer of editing operations such as texturing. This is achieved by a two-step approach. First, pointwise correspondences between the query region and the whole shape are established. The transformation parameters of these correspondences are registered in an appropriate transformation space. For transformations between similar regions, these parameters form surfaces in transformation space, which are extracted in the second step of our method. The extracted regions may be related to the query region by a non-rigid transform, enabling non-rigid shape matching.","lang":"eng"}],"intvolume":" 34","month":"11","scopus_import":1,"ddc":["000"],"date_updated":"2021-01-12T06:53:38Z","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:45:19Z","_id":"1854","pubrep_id":"574","status":"public","type":"journal_article","publication":"Computer Graphics Forum","day":"05","year":"2014","has_accepted_license":"1","date_created":"2018-12-11T11:54:22Z","date_published":"2014-11-05T00:00:00Z","doi":"10.1111/cgf.12509","page":"239 - 252","oa":1,"quality_controlled":"1","publisher":"Wiley","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"ista":"Guerrero P, Auzinger T, Wimmer M, Jeschke S. 2014. Partial shape matching using transformation parameter similarity. Computer Graphics Forum. 34(1), 239–252.","chicago":"Guerrero, Paul, Thomas Auzinger, Michael Wimmer, and Stefan Jeschke. “Partial Shape Matching Using Transformation Parameter Similarity.” Computer Graphics Forum. Wiley, 2014. https://doi.org/10.1111/cgf.12509.","ama":"Guerrero P, Auzinger T, Wimmer M, Jeschke S. Partial shape matching using transformation parameter similarity. Computer Graphics Forum. 2014;34(1):239-252. doi:10.1111/cgf.12509","apa":"Guerrero, P., Auzinger, T., Wimmer, M., & Jeschke, S. (2014). Partial shape matching using transformation parameter similarity. Computer Graphics Forum. Wiley. https://doi.org/10.1111/cgf.12509","short":"P. Guerrero, T. Auzinger, M. Wimmer, S. Jeschke, Computer Graphics Forum 34 (2014) 239–252.","ieee":"P. Guerrero, T. Auzinger, M. Wimmer, and S. Jeschke, “Partial shape matching using transformation parameter similarity,” Computer Graphics Forum, vol. 34, no. 1. Wiley, pp. 239–252, 2014.","mla":"Guerrero, Paul, et al. “Partial Shape Matching Using Transformation Parameter Similarity.” Computer Graphics Forum, vol. 34, no. 1, Wiley, 2014, pp. 239–52, doi:10.1111/cgf.12509."},"title":"Partial shape matching using transformation parameter similarity","publist_id":"5246","author":[{"first_name":"Paul","full_name":"Guerrero, Paul","last_name":"Guerrero"},{"first_name":"Thomas","id":"4718F954-F248-11E8-B48F-1D18A9856A87","full_name":"Auzinger, Thomas","orcid":"0000-0002-1546-3265","last_name":"Auzinger"},{"first_name":"Michael","full_name":"Wimmer, Michael","last_name":"Wimmer"},{"id":"44D6411A-F248-11E8-B48F-1D18A9856A87","first_name":"Stefan","full_name":"Jeschke, Stefan","last_name":"Jeschke"}]},{"project":[{"_id":"25357BD2-B435-11E9-9278-68D0E5697425","call_identifier":"FWF","name":"Deep Pictures: Creating Visual and Haptic Vector Images","grant_number":"P 24352-N23"}],"author":[{"first_name":"Murat","last_name":"Arikan","full_name":"Arikan, Murat"},{"first_name":"Reinhold","last_name":"Preiner","full_name":"Preiner, Reinhold"},{"last_name":"Scheiblauer","full_name":"Scheiblauer, Claus","first_name":"Claus"},{"last_name":"Jeschke","full_name":"Jeschke, Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87","first_name":"Stefan"},{"first_name":"Michael","full_name":"Wimmer, Michael","last_name":"Wimmer"}],"publist_id":"5189","title":"Large-scale point-cloud visualization through localized textured surface reconstruction","citation":{"ieee":"M. Arikan, R. Preiner, C. Scheiblauer, S. Jeschke, and M. Wimmer, “Large-scale point-cloud visualization through localized textured surface reconstruction,” IEEE Transactions on Visualization and Computer Graphics, vol. 20, no. 9. IEEE, pp. 1280–1292, 2014.","short":"M. Arikan, R. Preiner, C. Scheiblauer, S. Jeschke, M. Wimmer, IEEE Transactions on Visualization and Computer Graphics 20 (2014) 1280–1292.","ama":"Arikan M, Preiner R, Scheiblauer C, Jeschke S, Wimmer M. Large-scale point-cloud visualization through localized textured surface reconstruction. IEEE Transactions on Visualization and Computer Graphics. 2014;20(9):1280-1292. doi:10.1109/TVCG.2014.2312011","apa":"Arikan, M., Preiner, R., Scheiblauer, C., Jeschke, S., & Wimmer, M. (2014). Large-scale point-cloud visualization through localized textured surface reconstruction. IEEE Transactions on Visualization and Computer Graphics. IEEE. https://doi.org/10.1109/TVCG.2014.2312011","mla":"Arikan, Murat, et al. “Large-Scale Point-Cloud Visualization through Localized Textured Surface Reconstruction.” IEEE Transactions on Visualization and Computer Graphics, vol. 20, no. 9, IEEE, 2014, pp. 1280–92, doi:10.1109/TVCG.2014.2312011.","ista":"Arikan M, Preiner R, Scheiblauer C, Jeschke S, Wimmer M. 2014. Large-scale point-cloud visualization through localized textured surface reconstruction. IEEE Transactions on Visualization and Computer Graphics. 20(9), 1280–1292.","chicago":"Arikan, Murat, Reinhold Preiner, Claus Scheiblauer, Stefan Jeschke, and Michael Wimmer. “Large-Scale Point-Cloud Visualization through Localized Textured Surface Reconstruction.” IEEE Transactions on Visualization and Computer Graphics. IEEE, 2014. https://doi.org/10.1109/TVCG.2014.2312011."},"user_id":"4435EBFC-F248-11E8-B48F-1D18A9856A87","publisher":"IEEE","oa":1,"acknowledgement":"This research was supported by the Austrian Research Promotion Agency (FFG) project REPLICATE (no. 835948), the EU FP7 project HARVEST4D (no. 323567).","page":"1280 - 1292","doi":"10.1109/TVCG.2014.2312011","date_published":"2014-09-09T00:00:00Z","date_created":"2018-12-11T11:54:39Z","has_accepted_license":"1","year":"2014","day":"09","publication":"IEEE Transactions on Visualization and Computer Graphics","type":"journal_article","status":"public","pubrep_id":"573","_id":"1906","file_date_updated":"2020-07-14T12:45:20Z","department":[{"_id":"ChWo"}],"date_updated":"2021-01-12T06:53:59Z","ddc":["000"],"scopus_import":1,"month":"09","intvolume":" 20","abstract":[{"lang":"eng","text":"In this paper, we introduce a novel scene representation for the visualization of large-scale point clouds accompanied by a set of high-resolution photographs. Many real-world applications deal with very densely sampled point-cloud data, which are augmented with photographs that often reveal lighting variations and inaccuracies in registration. Consequently, the high-quality representation of the captured data, i.e., both point clouds and photographs together, is a challenging and time-consuming task. We propose a two-phase approach, in which the first (preprocessing) phase generates multiple overlapping surface patches and handles the problem of seamless texture generation locally for each patch. The second phase stitches these patches at render-time to produce a high-quality visualization of the data. As a result of the proposed localization of the global texturing problem, our algorithm is more than an order of magnitude faster than equivalent mesh-based texturing techniques. Furthermore, since our preprocessing phase requires only a minor fraction of the whole data set at once, we provide maximum flexibility when dealing with growing data sets."}],"oa_version":"Submitted Version","issue":"9","volume":20,"publication_status":"published","file":[{"checksum":"5bf58942d2eb20adf03c7f9ea2e68124","file_id":"5297","content_type":"application/pdf","access_level":"open_access","relation":"main_file","date_created":"2018-12-12T10:17:41Z","file_name":"IST-2016-573-v1+1_arikan-2014-pcvis-draft.pdf","date_updated":"2020-07-14T12:45:20Z","file_size":13594598,"creator":"system"}],"language":[{"iso":"eng"}]},{"oa":1,"publisher":"ACM","quality_controlled":"1","publication":"ACM Transactions on Graphics","day":"01","year":"2014","has_accepted_license":"1","date_created":"2018-12-11T11:55:28Z","doi":"10.1145/2601097.2601126","date_published":"2014-07-01T00:00:00Z","article_number":"137","project":[{"grant_number":"11-NSF-1070","name":"ROOTS Genome-wide Analysis of Root Traits","_id":"25636330-B435-11E9-9278-68D0E5697425"}],"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","citation":{"chicago":"Raveendran, Karthik, Chris Wojtan, Nils Thuerey, and Greg Türk. “Blending Liquids.” In ACM Transactions on Graphics, Vol. 33. ACM, 2014. https://doi.org/10.1145/2601097.2601126.","ista":"Raveendran K, Wojtan C, Thuerey N, Türk G. 2014. Blending liquids. ACM Transactions on Graphics. SIGGRAPH: International Conference and Exhibition on Computer Graphics and Interactive Techniques vol. 33, 137.","mla":"Raveendran, Karthik, et al. “Blending Liquids.” ACM Transactions on Graphics, vol. 33, no. 4, 137, ACM, 2014, doi:10.1145/2601097.2601126.","ieee":"K. Raveendran, C. Wojtan, N. Thuerey, and G. Türk, “Blending liquids,” in ACM Transactions on Graphics, Vancouver, Canada, 2014, vol. 33, no. 4.","short":"K. Raveendran, C. Wojtan, N. Thuerey, G. Türk, in:, ACM Transactions on Graphics, ACM, 2014.","apa":"Raveendran, K., Wojtan, C., Thuerey, N., & Türk, G. (2014). Blending liquids. In ACM Transactions on Graphics (Vol. 33). Vancouver, Canada: ACM. https://doi.org/10.1145/2601097.2601126","ama":"Raveendran K, Wojtan C, Thuerey N, Türk G. Blending liquids. In: ACM Transactions on Graphics. Vol 33. ACM; 2014. doi:10.1145/2601097.2601126"},"title":"Blending liquids","article_processing_charge":"No","author":[{"last_name":"Raveendran","full_name":"Raveendran, Karthik","first_name":"Karthik"},{"orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Nils","last_name":"Thuerey","full_name":"Thuerey, Nils"},{"last_name":"Türk","full_name":"Türk, Greg","first_name":"Greg"}],"publist_id":"4988","oa_version":"Submitted Version","abstract":[{"lang":"eng","text":"We present a method for smoothly blending between existing liquid animations. We introduce a semi-automatic method for matching two existing liquid animations, which we use to create new fluid motion that plausibly interpolates the input. Our contributions include a new space-time non-rigid iterative closest point algorithm that incorporates user guidance, a subsampling technique for efficient registration of meshes with millions of vertices, and a fast surface extraction algorithm that produces 3D triangle meshes from a 4D space-time surface. Our technique can be used to instantly create hundreds of new simulations, or to interactively explore complex parameter spaces. Our method is guaranteed to produce output that does not deviate from the input animations, and it generalizes to multiple dimensions. Because our method runs at interactive rates after the initial precomputation step, it has potential applications in games and training simulations."}],"intvolume":" 33","month":"07","scopus_import":"1","language":[{"iso":"eng"}],"file":[{"creator":"system","date_updated":"2020-07-14T12:45:27Z","file_size":8387384,"date_created":"2018-12-12T10:08:27Z","file_name":"IST-2016-606-v1+1_BlendingLiquids-Preprint.pdf","access_level":"open_access","relation":"main_file","content_type":"application/pdf","file_id":"4688","checksum":"1752760a2e71e254537f31c0d10d9c6c"}],"publication_status":"published","issue":"4","volume":33,"_id":"2058","pubrep_id":"606","status":"public","conference":{"location":"Vancouver, Canada","end_date":"2014-08-14","start_date":"2014-08-10","name":"SIGGRAPH: International Conference and Exhibition on Computer Graphics and Interactive Techniques"},"type":"conference","ddc":["000"],"date_updated":"2022-08-25T14:02:46Z","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:45:27Z"},{"type":"journal_article","status":"public","pubrep_id":"605","_id":"2466","file_date_updated":"2020-07-14T12:45:41Z","department":[{"_id":"ChWo"}],"date_updated":"2023-02-23T10:44:14Z","ddc":["000"],"scopus_import":1,"month":"07","intvolume":" 32","abstract":[{"text":"We introduce a new method for efficiently simulating liquid with extreme amounts of spatial adaptivity. Our method combines several key components to drastically speed up the simulation of large-scale fluid phenomena: We leverage an alternative Eulerian tetrahedral mesh discretization to significantly reduce the complexity of the pressure solve while increasing the robustness with respect to element quality and removing the possibility of locking. Next, we enable subtle free-surface phenomena by deriving novel second-order boundary conditions consistent with our discretization. We couple this discretization with a spatially adaptive Fluid-Implicit Particle (FLIP) method, enabling efficient, robust, minimally-dissipative simulations that can undergo sharp changes in spatial resolution while minimizing artifacts. Along the way, we provide a new method for generating a smooth and detailed surface from a set of particles with variable sizes. Finally, we explore several new sizing functions for determining spatially adaptive simulation resolutions, and we show how to couple them to our simulator. We combine each of these elements to produce a simulation algorithm that is capable of creating animations at high maximum resolutions while avoiding common pitfalls like inaccurate boundary conditions and inefficient computation.","lang":"eng"}],"oa_version":"Submitted Version","issue":"4","volume":32,"publication_status":"published","file":[{"file_id":"5279","checksum":"aeea6b0ff2b27c695aeb8408c7d2fc50","content_type":"application/pdf","access_level":"open_access","relation":"main_file","date_created":"2018-12-12T10:17:25Z","file_name":"IST-2016-605-v1+1_tetflip_fixed.pdf","date_updated":"2020-07-14T12:45:41Z","file_size":8601561,"creator":"system"}],"language":[{"iso":"eng"}],"article_number":"103","author":[{"last_name":"Ando","full_name":"Ando, Ryoichi","first_name":"Ryoichi"},{"last_name":"Thuerey","full_name":"Thuerey, Nils","first_name":"Nils"},{"first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan"}],"publist_id":"4436","title":"Highly adaptive liquid simulations on tetrahedral meshes","citation":{"chicago":"Ando, Ryoichi, Nils Thuerey, and Chris Wojtan. “Highly Adaptive Liquid Simulations on Tetrahedral Meshes.” ACM Transactions on Graphics. ACM, 2013. https://doi.org/10.1145/2461912.2461982.","ista":"Ando R, Thuerey N, Wojtan C. 2013. Highly adaptive liquid simulations on tetrahedral meshes. ACM Transactions on Graphics. 32(4), 103.","mla":"Ando, Ryoichi, et al. “Highly Adaptive Liquid Simulations on Tetrahedral Meshes.” ACM Transactions on Graphics, vol. 32, no. 4, 103, ACM, 2013, doi:10.1145/2461912.2461982.","ama":"Ando R, Thuerey N, Wojtan C. Highly adaptive liquid simulations on tetrahedral meshes. ACM Transactions on Graphics. 2013;32(4). doi:10.1145/2461912.2461982","apa":"Ando, R., Thuerey, N., & Wojtan, C. (2013). Highly adaptive liquid simulations on tetrahedral meshes. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/2461912.2461982","short":"R. Ando, N. Thuerey, C. Wojtan, ACM Transactions on Graphics 32 (2013).","ieee":"R. Ando, N. Thuerey, and C. Wojtan, “Highly adaptive liquid simulations on tetrahedral meshes,” ACM Transactions on Graphics, vol. 32, no. 4. ACM, 2013."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"ACM","quality_controlled":"1","oa":1,"date_published":"2013-07-01T00:00:00Z","doi":"10.1145/2461912.2461982","date_created":"2018-12-11T11:57:50Z","has_accepted_license":"1","year":"2013","day":"01","publication":"ACM Transactions on Graphics"},{"date_updated":"2023-02-23T10:44:16Z","ddc":["000"],"file_date_updated":"2020-07-14T12:45:41Z","department":[{"_id":"ChWo"}],"_id":"2467","type":"journal_article","status":"public","pubrep_id":"604","publication_status":"published","file":[{"file_id":"4768","checksum":"9c8425d62246996ca632c5a01870515b","content_type":"application/pdf","access_level":"open_access","relation":"main_file","date_created":"2018-12-12T10:09:43Z","file_name":"IST-2016-604-v1+1_toptop2013.pdf","date_updated":"2020-07-14T12:45:41Z","file_size":3514674,"creator":"system"}],"language":[{"iso":"eng"}],"volume":32,"issue":"4","abstract":[{"text":"This paper presents a method for computing topology changes for triangle meshes in an interactive geometric modeling environment. Most triangle meshes in practice do not exhibit desirable geometric properties, so we develop a solution that is independent of standard assumptions and robust to geometric errors. Specifically, we provide the first method for topology change applicable to arbitrary non-solid, non-manifold, non-closed, self-intersecting surfaces. We prove that this new method for topology change produces the expected conventional results when applied to solid (closed, manifold, non-self-intersecting) surfaces---that is, we prove a backwards-compatibility property relative to prior work. Beyond solid surfaces, we present empirical evidence that our method remains tolerant to a variety of surface aberrations through the incorporation of a novel error correction scheme. Finally, we demonstrate how topology change applied to non-solid objects enables wholly new and useful behaviors.","lang":"eng"}],"oa_version":"Submitted Version","scopus_import":1,"month":"07","intvolume":" 32","citation":{"mla":"Bernstein, Gilbert, and Chris Wojtan. “Putting Holes in Holey Geometry: Topology Change for Arbitrary Surfaces.” ACM Transactions on Graphics, vol. 32, no. 4, 34, ACM, 2013, doi:10.1145/2461912.2462027.","short":"G. Bernstein, C. Wojtan, ACM Transactions on Graphics 32 (2013).","ieee":"G. Bernstein and C. Wojtan, “Putting holes in holey geometry: Topology change for arbitrary surfaces,” ACM Transactions on Graphics, vol. 32, no. 4. ACM, 2013.","apa":"Bernstein, G., & Wojtan, C. (2013). Putting holes in holey geometry: Topology change for arbitrary surfaces. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/2461912.2462027","ama":"Bernstein G, Wojtan C. Putting holes in holey geometry: Topology change for arbitrary surfaces. ACM Transactions on Graphics. 2013;32(4). doi:10.1145/2461912.2462027","chicago":"Bernstein, Gilbert, and Chris Wojtan. “Putting Holes in Holey Geometry: Topology Change for Arbitrary Surfaces.” ACM Transactions on Graphics. ACM, 2013. https://doi.org/10.1145/2461912.2462027.","ista":"Bernstein G, Wojtan C. 2013. Putting holes in holey geometry: Topology change for arbitrary surfaces. ACM Transactions on Graphics. 32(4), 34."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"last_name":"Bernstein","full_name":"Bernstein, Gilbert","first_name":"Gilbert"},{"orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"publist_id":"4435","title":"Putting holes in holey geometry: Topology change for arbitrary surfaces","article_number":"34","has_accepted_license":"1","year":"2013","day":"01","publication":"ACM Transactions on Graphics","doi":"10.1145/2461912.2462027","date_published":"2013-07-01T00:00:00Z","date_created":"2018-12-11T11:57:50Z","quality_controlled":"1","publisher":"ACM","oa":1},{"publication_status":"published","language":[{"iso":"eng"}],"file":[{"date_created":"2018-12-12T10:09:37Z","file_name":"IST-2016-603-v1+1_liquidError_web.pdf","creator":"system","date_updated":"2020-07-14T12:45:41Z","file_size":5813685,"file_id":"4761","checksum":"53d905e0180e23ef3e813b969ffed4e1","access_level":"open_access","relation":"main_file","content_type":"application/pdf"}],"volume":32,"issue":"4","abstract":[{"lang":"eng","text":"Our work concerns the combination of an Eulerian liquid simulation with a high-resolution surface tracker (e.g. the level set method or a Lagrangian triangle mesh). The naive application of a high-resolution surface tracker to a low-resolution velocity field can produce many visually disturbing physical and topological artifacts that limit their use in practice. We address these problems by defining an error function which compares the current state of the surface tracker to the set of physically valid surface states. By reducing this error with a gradient descent technique, we introduce a novel physics-based surface fairing method. Similarly, by treating this error function as a potential energy, we derive a new surface correction force that mimics the vortex sheet equations. We demonstrate our results with both level set and mesh-based surface trackers."}],"oa_version":"Submitted Version","scopus_import":1,"intvolume":" 32","month":"07","date_updated":"2023-02-23T10:44:18Z","ddc":["000"],"department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:45:41Z","_id":"2468","type":"journal_article","pubrep_id":"603","status":"public","year":"2013","has_accepted_license":"1","publication":"ACM Transactions on Graphics","day":"01","date_created":"2018-12-11T11:57:50Z","doi":"10.1145/2461912.2461991","date_published":"2013-07-01T00:00:00Z","oa":1,"publisher":"ACM","quality_controlled":"1","citation":{"short":"M. Bojsen-Hansen, C. Wojtan, ACM Transactions on Graphics 32 (2013).","ieee":"M. Bojsen-Hansen and C. Wojtan, “Liquid surface tracking with error compensation,” ACM Transactions on Graphics, vol. 32, no. 4. ACM, 2013.","ama":"Bojsen-Hansen M, Wojtan C. Liquid surface tracking with error compensation. ACM Transactions on Graphics. 2013;32(4). doi:10.1145/2461912.2461991","apa":"Bojsen-Hansen, M., & Wojtan, C. (2013). Liquid surface tracking with error compensation. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/2461912.2461991","mla":"Bojsen-Hansen, Morten, and Chris Wojtan. “Liquid Surface Tracking with Error Compensation.” ACM Transactions on Graphics, vol. 32, no. 4, 68, ACM, 2013, doi:10.1145/2461912.2461991.","ista":"Bojsen-Hansen M, Wojtan C. 2013. Liquid surface tracking with error compensation. ACM Transactions on Graphics. 32(4), 68.","chicago":"Bojsen-Hansen, Morten, and Chris Wojtan. “Liquid Surface Tracking with Error Compensation.” ACM Transactions on Graphics. ACM, 2013. https://doi.org/10.1145/2461912.2461991."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"first_name":"Morten","id":"439F0C8C-F248-11E8-B48F-1D18A9856A87","full_name":"Bojsen-Hansen, Morten","orcid":"0000-0002-4417-3224","last_name":"Bojsen-Hansen"},{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546"}],"publist_id":"4434","title":"Liquid surface tracking with error compensation","article_number":"68"},{"publist_id":"3580","author":[{"first_name":"Karthik","last_name":"Raveendran","full_name":"Raveendran, Karthik"},{"first_name":"Nils","full_name":"Thuerey, Nils","last_name":"Thuerey"},{"full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"},{"first_name":"Greg","last_name":"Turk","full_name":"Turk, Greg"}],"title":"Controlling liquids using meshes","citation":{"mla":"Raveendran, Karthik, et al. “Controlling Liquids Using Meshes.” Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation, ACM, 2012, pp. 255–64.","short":"K. Raveendran, N. Thuerey, C. Wojtan, G. Turk, in:, Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation, ACM, 2012, pp. 255–264.","ieee":"K. Raveendran, N. Thuerey, C. Wojtan, and G. Turk, “Controlling liquids using meshes,” in Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation, Aire-la-Ville, Switzerland, 2012, pp. 255–264.","ama":"Raveendran K, Thuerey N, Wojtan C, Turk G. Controlling liquids using meshes. In: Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation. ACM; 2012:255-264.","apa":"Raveendran, K., Thuerey, N., Wojtan, C., & Turk, G. (2012). Controlling liquids using meshes. In Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation (pp. 255–264). Aire-la-Ville, Switzerland: ACM.","chicago":"Raveendran, Karthik, Nils Thuerey, Chris Wojtan, and Greg Turk. “Controlling Liquids Using Meshes.” In Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation, 255–64. ACM, 2012.","ista":"Raveendran K, Thuerey N, Wojtan C, Turk G. 2012. Controlling liquids using meshes. Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation. SCA: ACM SIGGRAPH/Eurographics Symposium on Computer animation, 255–264."},"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","quality_controlled":"1","publisher":"ACM","oa":1,"acknowledgement":"This work was partially funded by NSF grants CCF-0811485 and IIS-1130934. We would like to thank Scanline VFX for additional funding. We would like to thank Jie Tan as well as our anonymous reviewers for their useful suggestions and feedback.","page":"255 - 264","date_published":"2012-07-29T00:00:00Z","date_created":"2018-12-11T12:01:30Z","has_accepted_license":"1","year":"2012","day":"29","publication":"Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation","type":"conference","conference":{"start_date":"2012-07-29","end_date":"2012-07-31","location":"Aire-la-Ville, Switzerland","name":"SCA: ACM SIGGRAPH/Eurographics Symposium on Computer animation"},"status":"public","pubrep_id":"600","_id":"3119","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:46:00Z","date_updated":"2023-02-23T11:13:07Z","ddc":["000"],"scopus_import":1,"month":"07","abstract":[{"lang":"eng","text":"We present an approach for artist-directed animation of liquids using multiple levels of control over the simulation, ranging from the overall tracking of desired shapes to highly detailed secondary effects such as dripping streams, separating sheets of fluid, surface waves and ripples. The first portion of our technique is a volume preserving morph that allows the animator to produce a plausible fluid-like motion from a sparse set of control meshes. By rasterizing the resulting control meshes onto the simulation grid, the mesh velocities act as boundary conditions during the projection step of the fluid simulation. We can then blend this motion together with uncontrolled fluid velocities to achieve a more relaxed control over the fluid that captures natural inertial effects. Our method can produce highly detailed liquid surfaces with control over sub-grid details by using a mesh-based surface tracker on top of a coarse grid-based fluid simulation. We can create ripples and waves on the fluid surface attracting the surface mesh to the control mesh with spring-like forces and also by running a wave simulation over the surface mesh. Our video results demonstrate how our control scheme can be used to create animated characters and shapes that are made of water.\r\n"}],"oa_version":"Submitted Version","related_material":{"link":[{"url":"http://dl.acm.org/citation.cfm?id=2422393","relation":"table_of_contents"}]},"publication_status":"published","file":[{"file_id":"4877","checksum":"babda64c24cf90a4d05ae86d712bed08","content_type":"application/pdf","relation":"main_file","access_level":"open_access","file_name":"IST-2016-600-v1+1_ControllingLiquids_Preprint.pdf","date_created":"2018-12-12T10:11:23Z","file_size":4939370,"date_updated":"2020-07-14T12:46:00Z","creator":"system"}],"language":[{"iso":"eng"}]},{"type":"journal_article","article_type":"original","pubrep_id":"602","status":"public","_id":"3118","file_date_updated":"2020-07-14T12:46:00Z","department":[{"_id":"ChWo"}],"date_updated":"2022-05-24T08:21:11Z","ddc":["000"],"alternative_title":["SIGGRAPH"],"scopus_import":"1","intvolume":" 31","month":"07","abstract":[{"text":"We present a method for recovering a temporally coherent, deforming triangle mesh with arbitrarily changing topology from an incoherent sequence of static closed surfaces. We solve this problem using the surface geometry alone, without any prior information like surface templates or velocity fields. Our system combines a proven strategy for triangle mesh improvement, a robust multi-resolution non-rigid registration routine, and a reliable technique for changing surface mesh topology. We also introduce a novel topological constraint enforcement algorithm to ensure that the output and input always have similar topology. We apply our technique to a series of diverse input data from video reconstructions, physics simulations, and artistic morphs. The structured output of our algorithm allows us to efficiently track information like colors and displacement maps, recover velocity information, and solve PDEs on the mesh as a post process.","lang":"eng"}],"oa_version":"Submitted Version","volume":31,"issue":"4","publication_status":"published","language":[{"iso":"eng"}],"file":[{"creator":"system","date_updated":"2020-07-14T12:46:00Z","file_size":44538518,"date_created":"2018-12-12T10:18:37Z","file_name":"IST-2016-602-v1+1_topoReg.pdf","access_level":"open_access","relation":"main_file","content_type":"application/pdf","checksum":"1e219c5bf4e5552c1290c62eefa5cd60","file_id":"5359"}],"article_number":"53","article_processing_charge":"No","publist_id":"3581","author":[{"full_name":"Bojsen-Hansen, Morten","orcid":"0000-0002-4417-3224","last_name":"Bojsen-Hansen","first_name":"Morten","id":"439F0C8C-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Hao","full_name":"Li, Hao","last_name":"Li"},{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan"}],"title":"Tracking surfaces with evolving topology","citation":{"mla":"Bojsen-Hansen, Morten, et al. “Tracking Surfaces with Evolving Topology.” ACM Transactions on Graphics, vol. 31, no. 4, 53, ACM, 2012, doi:10.1145/2185520.2185549.","ama":"Bojsen-Hansen M, Li H, Wojtan C. Tracking surfaces with evolving topology. ACM Transactions on Graphics. 2012;31(4). doi:10.1145/2185520.2185549","apa":"Bojsen-Hansen, M., Li, H., & Wojtan, C. (2012). Tracking surfaces with evolving topology. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/2185520.2185549","short":"M. Bojsen-Hansen, H. Li, C. Wojtan, ACM Transactions on Graphics 31 (2012).","ieee":"M. Bojsen-Hansen, H. Li, and C. Wojtan, “Tracking surfaces with evolving topology,” ACM Transactions on Graphics, vol. 31, no. 4. ACM, 2012.","chicago":"Bojsen-Hansen, Morten, Hao Li, and Chris Wojtan. “Tracking Surfaces with Evolving Topology.” ACM Transactions on Graphics. ACM, 2012. https://doi.org/10.1145/2185520.2185549.","ista":"Bojsen-Hansen M, Li H, Wojtan C. 2012. Tracking surfaces with evolving topology. ACM Transactions on Graphics. 31(4), 53."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","oa":1,"quality_controlled":"1","publisher":"ACM","acknowledgement":"This work is supported by the SNF fellowship PBEZP2-134464.\r\nWe would like to thank Xiaochen Hu for implementing mesh con- version tools, Duygu Ceylan for helping with the rendering, and Art Tevs for the human performance data comparison. We also thank Nils Thuerey and Christopher Batty for helpful discussions. ","date_created":"2018-12-11T12:01:29Z","doi":"10.1145/2185520.2185549","date_published":"2012-07-01T00:00:00Z","year":"2012","has_accepted_license":"1","publication":"ACM Transactions on Graphics","day":"01"},{"citation":{"ista":"Yu J, Wojtan C, Turk G, Yap C. 2012. Explicit mesh surfaces for particle based fluids. Computer Graphics Forum. EUROGRAPHICS: Conference on European Association for Computer Graphics, Eurographics, vol. 31, 815–824.","chicago":"Yu, Jihun, Chris Wojtan, Greg Turk, and Chee Yap. “Explicit Mesh Surfaces for Particle Based Fluids.” In Computer Graphics Forum, 31:815–24. Wiley, 2012. https://doi.org/10.1111/j.1467-8659.2012.03062.x.","ama":"Yu J, Wojtan C, Turk G, Yap C. Explicit mesh surfaces for particle based fluids. In: Computer Graphics Forum. Vol 31. Wiley; 2012:815-824. doi:10.1111/j.1467-8659.2012.03062.x","apa":"Yu, J., Wojtan, C., Turk, G., & Yap, C. (2012). Explicit mesh surfaces for particle based fluids. In Computer Graphics Forum (Vol. 31, pp. 815–824). Cagliari, Sardinia, Italy: Wiley. https://doi.org/10.1111/j.1467-8659.2012.03062.x","short":"J. Yu, C. Wojtan, G. Turk, C. Yap, in:, Computer Graphics Forum, Wiley, 2012, pp. 815–824.","ieee":"J. Yu, C. Wojtan, G. Turk, and C. Yap, “Explicit mesh surfaces for particle based fluids,” in Computer Graphics Forum, Cagliari, Sardinia, Italy, 2012, vol. 31, no. 2, pp. 815–824.","mla":"Yu, Jihun, et al. “Explicit Mesh Surfaces for Particle Based Fluids.” Computer Graphics Forum, vol. 31, no. 2, Wiley, 2012, pp. 815–24, doi:10.1111/j.1467-8659.2012.03062.x."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publist_id":"3576","author":[{"first_name":"Jihun","full_name":"Yu, Jihun","last_name":"Yu"},{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan"},{"last_name":"Turk","full_name":"Turk, Greg","first_name":"Greg"},{"first_name":"Chee","full_name":"Yap, Chee","last_name":"Yap"}],"article_processing_charge":"No","title":"Explicit mesh surfaces for particle based fluids","acknowledgement":"This work was funded by NSF grant IIS-1017014 and CCF- 0917093.","quality_controlled":"1","publisher":"Wiley","oa":1,"has_accepted_license":"1","year":"2012","day":"01","publication":"Computer Graphics Forum","page":"815 - 824","doi":"10.1111/j.1467-8659.2012.03062.x","date_published":"2012-05-01T00:00:00Z","date_created":"2018-12-11T12:01:31Z","_id":"3123","type":"conference","conference":{"name":"EUROGRAPHICS: Conference on European Association for Computer Graphics","location":"Cagliari, Sardinia, Italy","end_date":"2012-05-18","start_date":"2012-05-13"},"status":"public","pubrep_id":"601","date_updated":"2023-10-16T09:54:40Z","ddc":["000"],"department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:46:00Z","abstract":[{"lang":"eng","text":"We introduce the idea of using an explicit triangle mesh to track the air/fluid interface in a smoothed particle hydrodynamics (SPH) simulator. Once an initial surface mesh is created, this mesh is carried forward in time using nearby particle velocities to advect the mesh vertices. The mesh connectivity remains mostly unchanged across time-steps; it is only modified locally for topology change events or for the improvement of triangle quality. In order to ensure that the surface mesh does not diverge from the underlying particle simulation, we periodically project the mesh surface onto an implicit surface defined by the physics simulation. The mesh surface gives us several advantages over previous SPH surface tracking techniques. We demonstrate a new method for surface tension calculations that clearly outperforms the state of the art in SPH surface tension for computer graphics. We also demonstrate a method for tracking detailed surface information (like colors) that is less susceptible to numerical diffusion than competing techniques. Finally, our temporally-coherent surface mesh allows us to simulate high-resolution surface wave dynamics without being limited by the particle resolution of the SPH simulation."}],"oa_version":"Submitted Version","alternative_title":["Eurographics"],"scopus_import":"1","month":"05","intvolume":" 31","publication_identifier":{"issn":["0167-7055"],"eissn":["1467-8659"]},"publication_status":"published","file":[{"checksum":"acb325dd1e31859bedd30e013f61d0b9","file_id":"5092","content_type":"application/pdf","relation":"main_file","access_level":"open_access","file_name":"IST-2016-601-v1+1_meshSPH.pdf","date_created":"2018-12-12T10:14:39Z","file_size":5740527,"date_updated":"2020-07-14T12:46:00Z","creator":"system"}],"language":[{"iso":"eng"}],"volume":31,"issue":"2"},{"title":"Hybrid smoothed particle hydrodynamics","editor":[{"last_name":"Spencer","full_name":"Spencer, Stephen","first_name":"Stephen"}],"publist_id":"3343","author":[{"full_name":"Raveendran, Karthik","last_name":"Raveendran","first_name":"Karthik"},{"last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Turk, Greg","last_name":"Turk","first_name":"Greg"}],"user_id":"4435EBFC-F248-11E8-B48F-1D18A9856A87","citation":{"mla":"Raveendran, Karthik, et al. Hybrid Smoothed Particle Hydrodynamics. Edited by Stephen Spencer, ACM, 2011, pp. 33–42, doi:10.1145/2019406.2019411.","short":"K. Raveendran, C. Wojtan, G. Turk, in:, S. Spencer (Ed.), ACM, 2011, pp. 33–42.","ieee":"K. Raveendran, C. Wojtan, and G. Turk, “Hybrid smoothed particle hydrodynamics,” presented at the SCA: ACM SIGGRAPH/Eurographics Symposium on Computer animation, Vancouver, Canada, 2011, pp. 33–42.","ama":"Raveendran K, Wojtan C, Turk G. Hybrid smoothed particle hydrodynamics. In: Spencer S, ed. ACM; 2011:33-42. doi:10.1145/2019406.2019411","apa":"Raveendran, K., Wojtan, C., & Turk, G. (2011). Hybrid smoothed particle hydrodynamics. In S. Spencer (Ed.) (pp. 33–42). Presented at the SCA: ACM SIGGRAPH/Eurographics Symposium on Computer animation, Vancouver, Canada: ACM. https://doi.org/10.1145/2019406.2019411","chicago":"Raveendran, Karthik, Chris Wojtan, and Greg Turk. “Hybrid Smoothed Particle Hydrodynamics.” edited by Stephen Spencer, 33–42. ACM, 2011. https://doi.org/10.1145/2019406.2019411.","ista":"Raveendran K, Wojtan C, Turk G. 2011. Hybrid smoothed particle hydrodynamics. SCA: ACM SIGGRAPH/Eurographics Symposium on Computer animation, 33–42."},"doi":"10.1145/2019406.2019411","date_published":"2011-08-05T00:00:00Z","date_created":"2018-12-11T12:02:32Z","page":"33 - 42","day":"05","has_accepted_license":"1","year":"2011","publisher":"ACM","quality_controlled":"1","oa":1,"department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:46:06Z","ddc":["000"],"date_updated":"2023-02-23T11:21:05Z","status":"public","pubrep_id":"598","type":"conference","conference":{"name":"SCA: ACM SIGGRAPH/Eurographics Symposium on Computer animation","location":"Vancouver, Canada","end_date":"2011-08-07","start_date":"2011-08-05"},"_id":"3298","file":[{"file_size":2536216,"date_updated":"2020-07-14T12:46:06Z","creator":"system","file_name":"IST-2016-598-v1+1_HybridSPH_Preprint.pdf","date_created":"2018-12-12T10:09:44Z","content_type":"application/pdf","relation":"main_file","access_level":"open_access","file_id":"4769","checksum":"6579d27709946e0eefbfa60a456b4913"}],"language":[{"iso":"eng"}],"publication_status":"published","month":"08","scopus_import":1,"oa_version":"Submitted Version","abstract":[{"text":"We present a new algorithm for enforcing incompressibility for Smoothed Particle Hydrodynamics (SPH) by preserving uniform density across the domain. We propose a hybrid method that uses a Poisson solve on a coarse grid to enforce a divergence free velocity field, followed by a local density correction of the particles. This avoids typical grid artifacts and maintains the Lagrangian nature of SPH by directly transferring pressures onto particles. Our method can be easily integrated with existing SPH techniques such as the incompressible PCISPH method as well as weakly compressible SPH by adding an additional force term. We show that this hybrid method accelerates convergence towards uniform density and permits a significantly larger time step compared to earlier approaches while producing similar results. We demonstrate our approach in a variety of scenarios with significant pressure gradients such as splashing liquids.","lang":"eng"}]},{"article_number":"8","author":[{"last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Müller Fischer, Matthias","last_name":"Müller Fischer","first_name":"Matthias"},{"last_name":"Brochu","full_name":"Brochu, Tyson","first_name":"Tyson"}],"publist_id":"3344","title":"Liquid simulation with mesh-based surface tracking","citation":{"ista":"Wojtan C, Müller Fischer M, Brochu T. 2011. Liquid simulation with mesh-based surface tracking. SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, 8.","chicago":"Wojtan, Chris, Matthias Müller Fischer, and Tyson Brochu. “Liquid Simulation with Mesh-Based Surface Tracking.” ACM, 2011. https://doi.org/10.1145/2037636.2037644.","apa":"Wojtan, C., Müller Fischer, M., & Brochu, T. (2011). Liquid simulation with mesh-based surface tracking. Presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Vancouver, BC, Canada: ACM. https://doi.org/10.1145/2037636.2037644","ama":"Wojtan C, Müller Fischer M, Brochu T. Liquid simulation with mesh-based surface tracking. In: ACM; 2011. doi:10.1145/2037636.2037644","short":"C. Wojtan, M. Müller Fischer, T. Brochu, in:, ACM, 2011.","ieee":"C. Wojtan, M. Müller Fischer, and T. Brochu, “Liquid simulation with mesh-based surface tracking,” presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Vancouver, BC, Canada, 2011.","mla":"Wojtan, Chris, et al. Liquid Simulation with Mesh-Based Surface Tracking. 8, ACM, 2011, doi:10.1145/2037636.2037644."},"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","publisher":"ACM","quality_controlled":"1","oa":1,"doi":"10.1145/2037636.2037644","date_published":"2011-08-07T00:00:00Z","date_created":"2018-12-11T12:02:31Z","has_accepted_license":"1","year":"2011","day":"07","type":"conference","conference":{"name":"SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques","start_date":"2011-08-07","location":"Vancouver, BC, Canada","end_date":"2011-08-11"},"status":"public","pubrep_id":"599","_id":"3297","file_date_updated":"2020-07-14T12:46:06Z","department":[{"_id":"ChWo"}],"date_updated":"2023-02-23T11:21:02Z","ddc":["000"],"scopus_import":1,"month":"08","abstract":[{"lang":"eng","text":"Animating detailed liquid surfaces has always been a challenge for computer graphics researchers and visual effects artists. Over the past few years, researchers in this field have focused on mesh-based surface tracking to synthesize extremely detailed liquid surfaces as efficiently as possible. This course provides a solid understanding of the steps required to create a fluid simulator with a mesh-based liquid surface.\r\n\r\nThe course begins with an overview of several existing liquid-surface-tracking techniques and the pros and cons of each method. Then it explains how to embed a triangle mesh into a finite-difference-based fluid simulator and describes several methods for allowing the liquid surface to merge together or break apart. The final section showcases the benefits and further applications of a mesh-based liquid surface, highlighting state-of-the-art methods for tracking colors and textures, maintaining liquid volume, preserving small surface features, and simulating realistic surface-tension waves."}],"oa_version":"Published Version","publication_status":"published","file":[{"checksum":"8d508ad7c82f50978acbaa4170ee0a75","file_id":"5018","relation":"main_file","access_level":"open_access","content_type":"application/pdf","file_name":"IST-2016-599-v1+1_meshyFluidsCourseSIGGRAPH2011.pdf","date_created":"2018-12-12T10:13:34Z","creator":"system","file_size":34672096,"date_updated":"2020-07-14T12:46:06Z"}],"language":[{"iso":"eng"}]}]