[{"quality_controlled":"1","publisher":"Association for Computing Machinery","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. 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.","date_published":"2021-08-01T00:00:00Z","doi":"10.1145/3450626.3459816","date_created":"2021-08-08T22:01:27Z","isi":1,"year":"2021","day":"01","publication":"ACM Transactions on Graphics","project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425"}],"article_number":"168","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"},{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan"}],"external_id":{"isi":["000674930900132"]},"article_processing_charge":"Yes (in subscription journal)","title":"Mechanics-aware deformation of yarn pattern geometry","citation":{"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.","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","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","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).","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."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","scopus_import":"1","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1145/3450626.3459816"}],"month":"08","intvolume":" 40","acknowledged_ssus":[{"_id":"ScienComp"}],"abstract":[{"lang":"eng","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."}],"oa_version":"Published Version","related_material":{"record":[{"status":"public","id":"12358","relation":"dissertation_contains"},{"relation":"software","id":"9327","status":"public"}],"link":[{"relation":"press_release","url":"https://ist.ac.at/en/news/knitting-virtual-yarn/","description":"News on IST Webpage"}]},"issue":"4","volume":40,"ec_funded":1,"publication_identifier":{"issn":["07300301"],"eissn":["15577368"]},"publication_status":"published","language":[{"iso":"eng"}],"article_type":"original","type":"journal_article","status":"public","_id":"9818","department":[{"_id":"GradSch"},{"_id":"ChWo"}],"date_updated":"2023-08-10T14:24:36Z"},{"author":[{"id":"4DD40360-F248-11E8-B48F-1D18A9856A87","first_name":"Georg","last_name":"Sperl","full_name":"Sperl, Georg"},{"first_name":"Rahul","full_name":"Narain, Rahul","last_name":"Narain"},{"last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"file_date_updated":"2021-04-26T09:33:44Z","department":[{"_id":"GradSch"},{"_id":"ChWo"}],"title":"Mechanics-Aware Deformation of Yarn Pattern Geometry (Additional Animation/Model Data)","date_updated":"2023-08-10T14:24:36Z","citation":{"apa":"Sperl, G., Narain, R., & Wojtan, C. 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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."},"ddc":["005"],"user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","type":"software","tmp":{"short":"MIT","name":"The MIT License","legal_code_url":"https://opensource.org/licenses/MIT"},"status":"public","_id":"9327","doi":"10.15479/AT:ISTA:9327","date_published":"2021-05-01T00:00:00Z","related_material":{"record":[{"id":"9818","status":"public","relation":"used_for_analysis_in"}]},"license":"https://opensource.org/licenses/MIT","date_created":"2021-04-16T14:26:19Z","has_accepted_license":"1","year":"2021","file":[{"file_size":802586232,"date_updated":"2021-04-16T14:15:12Z","creator":"gsperl","file_name":"MADYPG_extra_data.zip","date_created":"2021-04-16T14:15:12Z","content_type":"application/zip","relation":"main_file","access_level":"open_access","success":1,"checksum":"0324cb519273371708743f3282e7c081","file_id":"9328"},{"file_size":64962865,"date_updated":"2021-04-26T09:33:44Z","creator":"pub-gitlab-bot","file_name":"MADYPG.zip","date_created":"2021-04-26T09:33:44Z","content_type":"application/gzip","relation":"main_file","access_level":"open_access","checksum":"4c224551adf852b136ec21a4e13f0c1b","file_id":"9353"}],"publisher":"IST Austria","oa":1,"month":"05","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"}],"gitlab_url":"https://git.ist.ac.at/gsperl/MADYPG","gitlab_commit_id":"6a77e7e22769230ae5f5edaa090fb4b828e57573"},{"publication":"ACM Transactions on Graphics","day":"08","year":"2020","has_accepted_license":"1","isi":1,"date_created":"2020-09-20T22:01:37Z","doi":"10.1145/3386569.3392466","date_published":"2020-07-08T00:00:00Z","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.","oa":1,"quality_controlled":"1","publisher":"Association for Computing Machinery","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","citation":{"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.","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.","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","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.","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."},"title":"Wave curves: Simulating Lagrangian water waves on dynamically deforming surfaces","external_id":{"isi":["000583700300038"]},"article_processing_charge":"No","author":[{"full_name":"Skrivan, Tomas","last_name":"Skrivan","first_name":"Tomas","id":"486A5A46-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Soderstrom","full_name":"Soderstrom, Andreas","first_name":"Andreas"},{"first_name":"John","last_name":"Johansson","full_name":"Johansson, John"},{"full_name":"Sprenger, Christoph","last_name":"Sprenger","first_name":"Christoph"},{"first_name":"Ken","last_name":"Museth","full_name":"Museth, Ken"},{"orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"article_number":"65","project":[{"_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"},{"grant_number":"665385","name":"International IST Doctoral Program","call_identifier":"H2020","_id":"2564DBCA-B435-11E9-9278-68D0E5697425"}],"language":[{"iso":"eng"}],"file":[{"access_level":"open_access","relation":"main_file","content_type":"application/pdf","file_id":"8541","checksum":"c3a680893f01cc4a9e961ff0a4cfa12f","success":1,"creator":"dernst","date_updated":"2020-09-21T07:51:44Z","file_size":20223953,"date_created":"2020-09-21T07:51:44Z","file_name":"2020_ACM_Skrivan.pdf"}],"publication_status":"published","publication_identifier":{"issn":["07300301"],"eissn":["15577368"]},"ec_funded":1,"issue":"4","volume":39,"oa_version":"Published Version","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"}],"acknowledged_ssus":[{"_id":"ScienComp"}],"intvolume":" 39","month":"07","scopus_import":"1","ddc":["000"],"date_updated":"2023-08-22T09:28:27Z","file_date_updated":"2020-09-21T07:51:44Z","department":[{"_id":"ChWo"}],"_id":"8535","status":"public","article_type":"original","type":"journal_article"},{"file_date_updated":"2020-11-23T09:05:13Z","department":[{"_id":"ChWo"}],"date_updated":"2023-09-05T16:00:13Z","ddc":["000"],"article_type":"original","type":"journal_article","status":"public","keyword":["Computer Networks and Communications"],"_id":"8765","volume":39,"issue":"2","ec_funded":1,"publication_identifier":{"issn":["0167-7055"],"eissn":["1467-8659"]},"publication_status":"published","file":[{"success":1,"checksum":"7605f605acd84d0942b48bc7a1c2d72e","file_id":"8796","content_type":"application/pdf","relation":"main_file","access_level":"open_access","file_name":"2020_poff_revisited.pdf","date_created":"2020-11-23T09:05:13Z","file_size":38969122,"date_updated":"2020-11-23T09:05:13Z","creator":"dernst"}],"language":[{"iso":"eng"}],"scopus_import":"1","month":"05","intvolume":" 39","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"}],"acknowledged_ssus":[{"_id":"ScienComp"}],"oa_version":"Submitted Version","author":[{"id":"2B14B676-F248-11E8-B48F-1D18A9856A87","first_name":"Camille","full_name":"Schreck, Camille","last_name":"Schreck"},{"first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546"}],"external_id":{"isi":["000548709600008"]},"article_processing_charge":"No","title":"A practical method for animating anisotropic elastoplastic materials","citation":{"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.","ista":"Schreck C, Wojtan C. 2020. A practical method for animating anisotropic elastoplastic materials. Computer Graphics Forum. 39(2), 89–99.","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.","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","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","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."},"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425"}],"page":"89-99","doi":"10.1111/cgf.13914","date_published":"2020-05-01T00:00:00Z","date_created":"2020-11-17T09:35:10Z","has_accepted_license":"1","isi":1,"year":"2020","day":"01","publication":"Computer Graphics Forum","quality_controlled":"1","publisher":"Wiley","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."},{"_id":"5681","article_type":"original","type":"journal_article","status":"public","date_updated":"2023-09-18T09:30:01Z","ddc":["006"],"department":[{"_id":"ChWo"}],"file_date_updated":"2020-10-08T08:34:53Z","acknowledged_ssus":[{"_id":"ScienComp"}],"abstract":[{"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.","lang":"eng"}],"pmid":1,"oa_version":"Submitted Version","scopus_import":"1","month":"06","intvolume":" 26","publication_identifier":{"eissn":["19410506"],"issn":["10772626"]},"publication_status":"published","file":[{"relation":"main_file","access_level":"open_access","content_type":"application/pdf","success":1,"file_id":"8626","checksum":"8d4c55443a0ee335bb5bb652de503042","creator":"wojtan","file_size":21910098,"date_updated":"2020-10-08T08:34:53Z","file_name":"preprint.pdf","date_created":"2020-10-08T08:34:53Z"}],"language":[{"iso":"eng"}],"issue":"6","volume":26,"citation":{"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.","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.","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","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","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."},"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","author":[{"last_name":"Hikaru","full_name":"Hikaru, Ibayashi","first_name":"Ibayashi"},{"last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Nils","full_name":"Thuerey, Nils","last_name":"Thuerey"},{"first_name":"Takeo","full_name":"Igarashi, Takeo","last_name":"Igarashi"},{"full_name":"Ando, Ryoichi","last_name":"Ando","first_name":"Ryoichi"}],"article_processing_charge":"No","external_id":{"isi":["000532295600014"],"pmid":["30507534"]},"title":"Simulating liquids on dynamically warping grids","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.","publisher":"IEEE","quality_controlled":"1","oa":1,"has_accepted_license":"1","isi":1,"year":"2020","day":"01","publication":"IEEE Transactions on Visualization and Computer Graphics","page":"2288-2302","doi":"10.1109/TVCG.2018.2883628","date_published":"2020-06-01T00:00:00Z","date_created":"2018-12-16T22:59:21Z"},{"date_updated":"2024-02-28T12:57:31Z","ddc":["000"],"file_date_updated":"2020-11-23T09:03:19Z","department":[{"_id":"ChWo"}],"_id":"8384","article_type":"original","type":"journal_article","status":"public","publication_identifier":{"eissn":["15577368"],"issn":["07300301"]},"publication_status":"published","file":[{"content_type":"application/pdf","access_level":"open_access","relation":"main_file","file_id":"8795","checksum":"813831ca91319d794d9748c276b24578","success":1,"date_updated":"2020-11-23T09:03:19Z","file_size":14935529,"creator":"dernst","date_created":"2020-11-23T09:03:19Z","file_name":"2020_soapfilm_submitted.pdf"}],"language":[{"iso":"eng"}],"volume":39,"issue":"4","ec_funded":1,"abstract":[{"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.","lang":"eng"}],"acknowledged_ssus":[{"_id":"ScienComp"}],"oa_version":"Submitted Version","scopus_import":"1","main_file_link":[{"url":"https://doi.org/10.1145/3386569.3392405","open_access":"1"}],"month":"07","intvolume":" 39","citation":{"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.","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.","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).","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","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."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"last_name":"Ishida","full_name":"Ishida, Sadashige","first_name":"Sadashige","id":"6F7C4B96-A8E9-11E9-A7CA-09ECE5697425"},{"last_name":"Synak","full_name":"Synak, Peter","first_name":"Peter","id":"331776E2-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Fumiya","full_name":"Narita, Fumiya","last_name":"Narita"},{"full_name":"Hachisuka, Toshiya","last_name":"Hachisuka","first_name":"Toshiya"},{"last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"article_processing_charge":"No","external_id":{"isi":["000583700300004"]},"title":"A model for soap film dynamics with evolving thickness","article_number":"31","project":[{"call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"}],"has_accepted_license":"1","isi":1,"year":"2020","day":"08","publication":"ACM Transactions on Graphics","date_published":"2020-07-08T00:00:00Z","doi":"10.1145/3386569.3392405","date_created":"2020-09-13T22:01:18Z","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.","publisher":"Association for Computing Machinery","quality_controlled":"1","oa":1},{"scopus_import":"1","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1145/3386569.3392412"}],"month":"07","intvolume":" 39","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"}],"oa_version":"Submitted Version","volume":39,"related_material":{"record":[{"relation":"dissertation_contains","status":"public","id":"12358"}]},"issue":"4","ec_funded":1,"publication_identifier":{"eissn":["15577368"],"issn":["07300301"]},"publication_status":"published","file":[{"creator":"dernst","date_updated":"2020-11-23T09:01:22Z","file_size":38922662,"date_created":"2020-11-23T09:01:22Z","file_name":"2020_hylc_submitted.pdf","access_level":"open_access","relation":"main_file","content_type":"application/pdf","file_id":"8794","checksum":"cf4c1d361c3196c4bd424520a5588205","success":1}],"language":[{"iso":"eng"}],"article_type":"original","type":"journal_article","status":"public","_id":"8385","department":[{"_id":"ChWo"}],"file_date_updated":"2020-11-23T09:01:22Z","date_updated":"2024-02-28T12:57:47Z","ddc":["000"],"quality_controlled":"1","publisher":"Association for Computing Machinery","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. 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_published":"2020-07-08T00:00:00Z","doi":"10.1145/3386569.3392412","date_created":"2020-09-13T22:01:18Z","isi":1,"has_accepted_license":"1","year":"2020","day":"08","publication":"ACM Transactions on Graphics","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","author":[{"last_name":"Sperl","full_name":"Sperl, Georg","first_name":"Georg","id":"4DD40360-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Narain","full_name":"Narain, Rahul","first_name":"Rahul"},{"first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546"}],"article_processing_charge":"No","external_id":{"isi":["000583700300021"]},"title":"Homogenized yarn-level cloth","citation":{"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.","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","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).","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.","ista":"Sperl G, Narain R, Wojtan C. 2020. Homogenized yarn-level cloth. ACM Transactions on Graphics. 39(4), 48."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87"},{"publisher":"Wiley","quality_controlled":"1","page":"47-54","date_published":"2020-12-01T00:00:00Z","doi":"10.1111/cgf.14100","date_created":"2020-11-17T10:47:48Z","isi":1,"year":"2020","day":"01","publication":"Computer Graphics forum","project":[{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"},{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","grant_number":"715767","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425"}],"author":[{"id":"44D6411A-F248-11E8-B48F-1D18A9856A87","first_name":"Stefan","full_name":"Jeschke, Stefan","last_name":"Jeschke"},{"last_name":"Hafner","full_name":"Hafner, Christian","first_name":"Christian","id":"400429CC-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Nuttapong","full_name":"Chentanez, Nuttapong","last_name":"Chentanez"},{"last_name":"Macklin","full_name":"Macklin, Miles","first_name":"Miles"},{"last_name":"Müller-Fischer","full_name":"Müller-Fischer, Matthias","first_name":"Matthias"},{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J"}],"article_processing_charge":"No","external_id":{"isi":["000591780400005"]},"title":"Making procedural water waves boundary-aware","citation":{"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.","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","ama":"Jeschke S, Hafner C, Chentanez N, Macklin M, Müller-Fischer M, Wojtan C. Making procedural water waves boundary-aware. 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Wiley, 2020. https://doi.org/10.1111/cgf.14100."},"user_id":"2EBD1598-F248-11E8-B48F-1D18A9856A87","scopus_import":"1","month":"12","intvolume":" 39","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."}],"oa_version":"None","volume":39,"issue":"8","ec_funded":1,"publication_status":"published","language":[{"iso":"eng"}],"article_type":"original","type":"journal_article","conference":{"name":"SCA: Symposium on Computer Animation","end_date":"2020-10-09","location":"Online Symposium","start_date":"2020-10-06"},"status":"public","_id":"8766","department":[{"_id":"ChWo"},{"_id":"BeBi"}],"date_updated":"2024-02-28T13:58:11Z"},{"status":"public","type":"journal_article","_id":"6442","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:47:30Z","ddc":["000","005"],"date_updated":"2023-08-25T10:18:46Z","month":"07","intvolume":" 38","scopus_import":"1","oa_version":"Submitted Version","acknowledged_ssus":[{"_id":"ScienComp"}],"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."}],"related_material":{"link":[{"url":"https://ist.ac.at/en/news/new-method-makes-realistic-water-wave-animations-more-efficient/","relation":"press_release","description":"News on IST Homepage"}]},"issue":"4","volume":38,"ec_funded":1,"file":[{"date_created":"2019-05-14T07:03:55Z","file_name":"2019_ACM_Schreck.pdf","date_updated":"2020-07-14T12:47:30Z","file_size":44328918,"creator":"dernst","checksum":"1b737dfe3e051aba8f3f4ab1dceda673","file_id":"6443","content_type":"application/pdf","access_level":"open_access","relation":"main_file"}],"language":[{"iso":"eng"}],"publication_status":"published","project":[{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"},{"grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425"},{"name":"International IST Doctoral Program","grant_number":"665385","_id":"2564DBCA-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"article_number":"130","title":"Fundamental solutions for water wave animation","author":[{"first_name":"Camille","id":"2B14B676-F248-11E8-B48F-1D18A9856A87","full_name":"Schreck, Camille","last_name":"Schreck"},{"full_name":"Hafner, Christian","last_name":"Hafner","first_name":"Christian","id":"400429CC-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"external_id":{"isi":["000475740600104"]},"article_processing_charge":"No","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","citation":{"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.","ista":"Schreck C, Hafner C, Wojtan C. 2019. Fundamental solutions for water wave animation. ACM Transactions on Graphics. 38(4), 130.","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.","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)."},"publisher":"ACM","quality_controlled":"1","oa":1,"doi":"10.1145/3306346.3323002","date_published":"2019-07-01T00:00:00Z","date_created":"2019-05-14T07:04:06Z","day":"01","publication":"ACM Transactions on Graphics","isi":1,"has_accepted_license":"1","year":"2019"},{"department":[{"_id":"ChWo"}],"date_updated":"2023-08-30T07:21:25Z","article_type":"original","type":"journal_article","status":"public","_id":"7002","volume":38,"issue":"4","ec_funded":1,"publication_identifier":{"issn":["0730-0301"]},"publication_status":"published","language":[{"iso":"eng"}],"scopus_import":"1","month":"07","intvolume":" 38","abstract":[{"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.","lang":"eng"}],"oa_version":"None","author":[{"last_name":"Kondapaneni","full_name":"Kondapaneni, Ivo","first_name":"Ivo"},{"first_name":"Petr","full_name":"Vevoda, Petr","last_name":"Vevoda"},{"first_name":"Pascal","full_name":"Grittmann, Pascal","last_name":"Grittmann"},{"id":"486A5A46-F248-11E8-B48F-1D18A9856A87","first_name":"Tomas","last_name":"Skrivan","full_name":"Skrivan, Tomas"},{"full_name":"Slusallek, Philipp","last_name":"Slusallek","first_name":"Philipp"},{"first_name":"Jaroslav","last_name":"Křivánek","full_name":"Křivánek, Jaroslav"}],"external_id":{"isi":["000475740600011"]},"article_processing_charge":"No","title":"Optimal multiple importance sampling","citation":{"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.","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.","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.","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","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","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. 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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."}],"department":[{"_id":"ChWo"}],"date_updated":"2023-09-06T15:22:23Z","status":"public","type":"journal_article","article_type":"original","_id":"7418","date_created":"2020-01-30T10:19:43Z","date_published":"2019-11-01T00:00:00Z","doi":"10.1145/3355089.3356565","publication":"ACM Transactions on Graphics","day":"01","year":"2019","isi":1,"publisher":"ACM","quality_controlled":"1","title":"MIS compensation: Optimizing sampling techniques in multiple importance sampling","article_processing_charge":"No","external_id":{"isi":["000498397300001"]},"author":[{"first_name":"Ondřej","full_name":"Karlík, Ondřej","last_name":"Karlík"},{"last_name":"Šik","full_name":"Šik, Martin","first_name":"Martin"},{"first_name":"Petr","full_name":"Vévoda, Petr","last_name":"Vévoda"},{"first_name":"Tomas","id":"486A5A46-F248-11E8-B48F-1D18A9856A87","last_name":"Skrivan","full_name":"Skrivan, Tomas"},{"last_name":"Křivánek","full_name":"Křivánek, Jaroslav","first_name":"Jaroslav"}],"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","citation":{"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","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","short":"O. Karlík, M. Šik, P. Vévoda, T. Skrivan, J. Křivánek, ACM Transactions on Graphics 38 (2019).","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.","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.","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.","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."},"article_number":"151"},{"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","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1902.07983"}],"scopus_import":"1","intvolume":" 2107","month":"05","publication_status":"published","language":[{"iso":"eng"}],"volume":2107,"_id":"6642","conference":{"location":"Zlin, Czech Republic","end_date":"2019-07-31","start_date":"2019-07-30","name":"8th International Conference on Novel Trends in Rheology"},"type":"conference","status":"public","date_updated":"2024-02-28T13:01:28Z","department":[{"_id":"ChWo"}],"oa":1,"publisher":"AIP Publishing","quality_controlled":"1","year":"2019","isi":1,"publication":"AIP Conference Proceedings","day":"21","date_created":"2019-07-15T10:07:09Z","doi":"10.1063/1.5109493","date_published":"2019-05-21T00:00:00Z","article_number":"020002","citation":{"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","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","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.","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.","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.","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."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","external_id":{"arxiv":["1902.07983"],"isi":["000479303100002"]},"article_processing_charge":"No","author":[{"last_name":"Dostalík","full_name":"Dostalík, Mark","first_name":"Mark"},{"last_name":"Pruša","full_name":"Pruša, Vít","first_name":"Vít"},{"id":"486A5A46-F248-11E8-B48F-1D18A9856A87","first_name":"Tomas","last_name":"Skrivan","full_name":"Skrivan, Tomas"}],"title":"On diffusive variants of some classical viscoelastic rate-type models"},{"publication_status":"published","publication_identifier":{"issn":["0167-7055"]},"language":[{"iso":"eng"}],"file":[{"content_type":"application/pdf","access_level":"open_access","relation":"main_file","checksum":"8edb90da8a72395eb5d970580e0925b6","file_id":"8627","success":1,"date_updated":"2020-10-08T08:38:23Z","file_size":54309947,"creator":"wojtan","date_created":"2020-10-08T08:38:23Z","file_name":"exnbflip.pdf"}],"ec_funded":1,"volume":37,"issue":"2","abstract":[{"lang":"eng","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."}],"oa_version":"Submitted Version","alternative_title":["Eurographics"],"scopus_import":"1","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","has_accepted_license":"1","isi":1,"publication":"Computer Graphics Forum","day":"22","page":"169 - 177","date_created":"2018-12-11T11:44:49Z","date_published":"2018-05-22T00:00:00Z","doi":"10.1111/cgf.13351","oa":1,"quality_controlled":"1","publisher":"Wiley","citation":{"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","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.","short":"T. Sato, C. Wojtan, N. Thuerey, T. Igarashi, R. Ando, Computer Graphics Forum 37 (2018) 169–177.","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.","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.","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."},"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","external_id":{"isi":["000434085600016"]},"article_processing_charge":"No","author":[{"first_name":"Takahiro","last_name":"Sato","full_name":"Sato, Takahiro"},{"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":"Nils","last_name":"Thuerey","full_name":"Thuerey, Nils"},{"last_name":"Igarashi","full_name":"Igarashi, Takeo","first_name":"Takeo"},{"last_name":"Ando","full_name":"Ando, Ryoichi","first_name":"Ryoichi"}],"title":"Extended narrow band FLIP for liquid simulations","project":[{"_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"}]},{"article_number":"94","project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425"},{"grant_number":"665385","name":"International IST Doctoral Program","call_identifier":"H2020","_id":"2564DBCA-B435-11E9-9278-68D0E5697425"}],"user_id":"2EBD1598-F248-11E8-B48F-1D18A9856A87","citation":{"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","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.","short":"S. Jeschke, T. Skrivan, M. Mueller Fischer, N. Chentanez, M. Macklin, C. Wojtan, ACM Transactions on Graphics 37 (2018).","mla":"Jeschke, Stefan, et al. “Water Surface Wavelets.” ACM Transactions on Graphics, vol. 37, no. 4, 94, ACM, 2018, doi: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.","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."},"title":"Water surface wavelets","author":[{"first_name":"Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87","last_name":"Jeschke","full_name":"Jeschke, Stefan"},{"id":"486A5A46-F248-11E8-B48F-1D18A9856A87","first_name":"Tomas","last_name":"Skrivan","full_name":"Skrivan, Tomas"},{"full_name":"Mueller Fischer, Matthias","last_name":"Mueller Fischer","first_name":"Matthias"},{"last_name":"Chentanez","full_name":"Chentanez, Nuttapong","first_name":"Nuttapong"},{"last_name":"Macklin","full_name":"Macklin, Miles","first_name":"Miles"},{"orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"publist_id":"7789","article_processing_charge":"No","external_id":{"isi":["000448185000055"]},"quality_controlled":"1","publisher":"ACM","oa":1,"day":"30","publication":"ACM Transactions on Graphics","has_accepted_license":"1","isi":1,"year":"2018","date_published":"2018-07-30T00:00:00Z","doi":"10.1145/3197517.3201336","date_created":"2018-12-11T11:44:48Z","_id":"134","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)"},"ddc":["000"],"date_updated":"2024-02-28T13:58:51Z","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:44:45Z","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"}],"month":"07","intvolume":" 37","scopus_import":"1","alternative_title":["SIGGRAPH"],"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,"file_id":"5744","checksum":"db75ebabe2ec432bf41389e614d6ef62","access_level":"open_access","relation":"main_file","content_type":"application/pdf"}],"language":[{"iso":"eng"}],"publication_status":"published","volume":37,"related_material":{"link":[{"description":"News on IST Homepage","relation":"press_release","url":"https://ist.ac.at/en/news/new-water-simulation-captures-small-details-even-in-large-scenes/"}]},"issue":"4","ec_funded":1,"license":"https://creativecommons.org/licenses/by-nc-sa/4.0/"},{"status":"public","article_type":"original","type":"journal_article","_id":"470","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:46:34Z","ddc":["006"],"date_updated":"2023-02-23T12:20:26Z","month":"07","intvolume":" 36","scopus_import":1,"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"}],"issue":"4","volume":36,"ec_funded":1,"file":[{"file_size":13131683,"date_updated":"2020-07-14T12:46:34Z","creator":"wojtan","file_name":"wavepackets_final.pdf","date_created":"2020-01-24T09:32:35Z","content_type":"application/pdf","relation":"main_file","access_level":"open_access","checksum":"82a3b2bfeee4ddef16ecc21675d1a48a","file_id":"7359"}],"language":[{"iso":"eng"}],"publication_identifier":{"issn":["07300301"]},"publication_status":"published","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":"103","title":"Water wave packets","publist_id":"7350","author":[{"full_name":"Jeschke, Stefan","last_name":"Jeschke","first_name":"Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"article_processing_charge":"Yes (in subscription journal)","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"ista":"Jeschke S, Wojtan C. 2017. Water wave packets. ACM Transactions on Graphics. 36(4), 103.","chicago":"Jeschke, Stefan, and Chris Wojtan. “Water Wave Packets.” ACM Transactions on Graphics. ACM, 2017. https://doi.org/10.1145/3072959.3073678.","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","short":"S. Jeschke, C. Wojtan, ACM Transactions on Graphics 36 (2017).","ieee":"S. Jeschke and C. Wojtan, “Water wave packets,” ACM Transactions on Graphics, vol. 36, no. 4. ACM, 2017.","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."},"publisher":"ACM","quality_controlled":"1","oa":1,"doi":"10.1145/3072959.3073678","date_published":"2017-07-01T00:00:00Z","date_created":"2018-12-11T11:46:39Z","day":"01","publication":"ACM Transactions on Graphics","has_accepted_license":"1","year":"2017"},{"quality_controlled":"1","publisher":"Wiley","oa":1,"year":"2017","day":"01","publication":"Computer Graphics Forum","page":"95 - 106","date_published":"2017-05-01T00:00:00Z","doi":"10.1111/cgf.13110","date_created":"2018-12-11T11:47:49Z","project":[{"name":"Deep Pictures: Creating Visual and Haptic Vector Images","grant_number":"P 24352-N23","_id":"25357BD2-B435-11E9-9278-68D0E5697425","call_identifier":"FWF"}],"citation":{"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.","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.","chicago":"Schreck, Camille, Damien Rohmer, and Stefanie Hahmann. “Interactive Paper Tearing.” Computer Graphics Forum. Wiley, 2017. https://doi.org/10.1111/cgf.13110.","ista":"Schreck C, Rohmer D, Hahmann S. 2017. Interactive paper tearing. Computer Graphics Forum. 36(2), 95–106."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publist_id":"7056","author":[{"id":"2B14B676-F248-11E8-B48F-1D18A9856A87","first_name":"Camille","full_name":"Schreck, Camille","last_name":"Schreck"},{"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","abstract":[{"lang":"eng","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."}],"oa_version":"Published Version","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","publication_identifier":{"issn":["01677055"]},"publication_status":"published","language":[{"iso":"eng"}],"volume":36,"issue":"2","_id":"670","type":"journal_article","article_type":"original","status":"public","date_updated":"2021-01-12T08:08:37Z","ddc":["000"],"department":[{"_id":"ChWo"}]},{"author":[{"last_name":"Manteaux","full_name":"Manteaux, Pierre","first_name":"Pierre"},{"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":"Rahul","last_name":"Narain","full_name":"Narain, Rahul"},{"last_name":"Redon","full_name":"Redon, Stéphane","first_name":"Stéphane"},{"first_name":"François","last_name":"Faure","full_name":"Faure, François"},{"full_name":"Cani, Marie","last_name":"Cani","first_name":"Marie"}],"publist_id":"5873","article_processing_charge":"No","external_id":{"isi":["000408634200019"]},"title":"Adaptive physically based models in computer graphics","citation":{"short":"P. Manteaux, C. Wojtan, R. Narain, S. Redon, F. Faure, M. Cani, Computer Graphics Forum 36 (2017) 312–337.","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.","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","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.","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.","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."},"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","page":"312 - 337","date_published":"2017-09-01T00:00:00Z","doi":"10.1111/cgf.12941","date_created":"2018-12-11T11:51:37Z","isi":1,"has_accepted_license":"1","year":"2017","day":"01","publication":"Computer Graphics Forum","publisher":"Wiley-Blackwell","quality_controlled":"1","oa":1,"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).","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:44:47Z","date_updated":"2023-09-20T11:05:36Z","ddc":["000"],"type":"journal_article","status":"public","pubrep_id":"634","_id":"1367","volume":36,"issue":"6","publication_identifier":{"issn":["01677055"]},"publication_status":"published","file":[{"content_type":"application/pdf","access_level":"open_access","relation":"main_file","checksum":"7676e9a9ead6d58c3000988c97deb2ef","file_id":"5208","date_updated":"2020-07-14T12:44:47Z","file_size":1434439,"creator":"system","date_created":"2018-12-12T10:16:21Z","file_name":"IST-2016-634-v1+1_starAdaptivity-cgf.pdf"}],"language":[{"iso":"eng"}],"scopus_import":"1","month":"09","intvolume":" 36","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"},{"_id":"1152","status":"public","type":"journal_article","ddc":["000"],"date_updated":"2023-09-20T11:29:44Z","department":[{"_id":"ChWo"}],"file_date_updated":"2019-01-18T08:43:16Z","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"}],"month":"01","intvolume":" 18","scopus_import":"1","file":[{"creator":"dernst","date_updated":"2019-01-18T08:43:16Z","file_size":1083911,"date_created":"2019-01-18T08:43:16Z","file_name":"2016_jocs_ewa.pdf","access_level":"open_access","relation":"main_file","content_type":"application/pdf","file_id":"5842","success":1}],"language":[{"iso":"eng"}],"publication_identifier":{"issn":["18777503"]},"publication_status":"published","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.","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","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"},"title":"A multi objective memetic inverse solver reinforced by local optimization methods","author":[{"last_name":"Gajda-Zagorska","full_name":"Gajda-Zagorska, Ewa P","id":"47794CF0-F248-11E8-B48F-1D18A9856A87","first_name":"Ewa P"},{"full_name":"Schaefer, Robert","last_name":"Schaefer","first_name":"Robert"},{"full_name":"Smołka, Maciej","last_name":"Smołka","first_name":"Maciej"},{"last_name":"Pardo","full_name":"Pardo, David","first_name":"David"},{"full_name":"Alvarez Aramberri, Julen","last_name":"Alvarez Aramberri","first_name":"Julen"}],"publist_id":"6206","external_id":{"isi":["000393528700009"]},"article_processing_charge":"No","publisher":"Elsevier","quality_controlled":"1","oa":1,"day":"01","publication":"Journal of Computational Science","has_accepted_license":"1","isi":1,"year":"2017","doi":"10.1016/j.jocs.2016.06.007","date_published":"2017-01-01T00:00:00Z","date_created":"2018-12-11T11:50:26Z","page":"85 - 94"},{"oa":1,"publisher":"IEEE","quality_controlled":"1","date_created":"2018-12-11T11:49:37Z","date_published":"2017-04-14T00:00:00Z","doi":"10.1109/CVPR.2017.587","page":"5533 - 5542","day":"14","year":"2017","isi":1,"project":[{"_id":"2532554C-B435-11E9-9278-68D0E5697425","call_identifier":"FP7","name":"Lifelong Learning of Visual Scene Understanding","grant_number":"308036"}],"title":"iCaRL: Incremental classifier and representation learning","external_id":{"isi":["000418371405066"]},"article_processing_charge":"No","author":[{"last_name":"Rebuffi","full_name":"Rebuffi, Sylvestre Alvise","first_name":"Sylvestre Alvise"},{"full_name":"Kolesnikov, Alexander","last_name":"Kolesnikov","first_name":"Alexander","id":"2D157DB6-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Sperl","full_name":"Sperl, Georg","id":"4DD40360-F248-11E8-B48F-1D18A9856A87","first_name":"Georg"},{"id":"40C20FD2-F248-11E8-B48F-1D18A9856A87","first_name":"Christoph","orcid":"0000-0001-8622-7887","full_name":"Lampert, Christoph","last_name":"Lampert"}],"publist_id":"6400","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","citation":{"apa":"Rebuffi, S. A., Kolesnikov, A., Sperl, G., & Lampert, C. (2017). iCaRL: Incremental classifier and representation learning (Vol. 2017, pp. 5533–5542). Presented at the CVPR: Computer Vision and Pattern Recognition, Honolulu, HA, United States: IEEE. https://doi.org/10.1109/CVPR.2017.587","ama":"Rebuffi SA, Kolesnikov A, Sperl G, Lampert C. iCaRL: Incremental classifier and representation learning. In: Vol 2017. IEEE; 2017:5533-5542. doi:10.1109/CVPR.2017.587","ieee":"S. A. Rebuffi, A. Kolesnikov, G. Sperl, and C. Lampert, “iCaRL: Incremental classifier and representation learning,” presented at the CVPR: Computer Vision and Pattern Recognition, Honolulu, HA, United States, 2017, vol. 2017, pp. 5533–5542.","short":"S.A. Rebuffi, A. Kolesnikov, G. Sperl, C. Lampert, in:, IEEE, 2017, pp. 5533–5542.","mla":"Rebuffi, Sylvestre Alvise, et al. ICaRL: Incremental Classifier and Representation Learning. Vol. 2017, IEEE, 2017, pp. 5533–42, doi:10.1109/CVPR.2017.587.","ista":"Rebuffi SA, Kolesnikov A, Sperl G, Lampert C. 2017. iCaRL: Incremental classifier and representation learning. CVPR: Computer Vision and Pattern Recognition vol. 2017, 5533–5542.","chicago":"Rebuffi, Sylvestre Alvise, Alexander Kolesnikov, Georg Sperl, and Christoph Lampert. “ICaRL: Incremental Classifier and Representation Learning,” 2017:5533–42. IEEE, 2017. https://doi.org/10.1109/CVPR.2017.587."},"intvolume":" 2017","month":"04","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1611.07725"}],"scopus_import":"1","oa_version":"Submitted Version","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"}],"ec_funded":1,"volume":2017,"language":[{"iso":"eng"}],"publication_status":"published","publication_identifier":{"isbn":["978-153860457-1"]},"status":"public","conference":{"start_date":"2017-07-21","location":"Honolulu, HA, United States","end_date":"2017-07-26","name":"CVPR: Computer Vision and Pattern Recognition"},"type":"conference","_id":"998","department":[{"_id":"ChLa"},{"_id":"ChWo"}],"date_updated":"2023-09-22T09:51:58Z"},{"file_date_updated":"2020-07-14T12:48:13Z","department":[{"_id":"ChWo"}],"supervisor":[{"orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"date_updated":"2024-02-21T13:48:02Z","ddc":["004","005","006","531","621"],"type":"dissertation","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","pubrep_id":"855","_id":"839","related_material":{"record":[{"status":"public","id":"1362","relation":"part_of_dissertation"},{"status":"public","id":"1633","relation":"part_of_dissertation"},{"status":"public","id":"5568","relation":"popular_science"}]},"license":"https://creativecommons.org/licenses/by-sa/4.0/","ec_funded":1,"publication_identifier":{"issn":["2663-337X"]},"publication_status":"published","degree_awarded":"PhD","file":[{"content_type":"application/pdf","access_level":"open_access","relation":"main_file","file_id":"5100","checksum":"6c1ae8c90bfaba5e089417fefbc4a272","date_updated":"2020-07-14T12:48:13Z","file_size":14596191,"creator":"system","date_created":"2018-12-12T10:14:46Z","file_name":"IST-2017-855-v1+1_thesis_online_pdfA.pdf"},{"file_size":15060566,"date_updated":"2020-07-14T12:48:13Z","creator":"dernst","file_name":"2017_thesis_Hahn_source.zip","date_created":"2019-04-05T08:40:30Z","content_type":"application/zip","relation":"source_file","access_level":"closed","file_id":"6207","checksum":"421672f68d563b029869c5cf1713f919"}],"language":[{"iso":"eng"}],"alternative_title":["ISTA Thesis"],"month":"08","abstract":[{"text":"This thesis describes a brittle fracture simulation method for visual effects applications. 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. ","lang":"eng"}],"oa_version":"Published Version","author":[{"first_name":"David","id":"357A6A66-F248-11E8-B48F-1D18A9856A87","last_name":"Hahn","full_name":"Hahn, David"}],"publist_id":"6809","article_processing_charge":"No","title":"Brittle fracture simulation with boundary elements for computer graphics","citation":{"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.","ieee":"D. Hahn, “Brittle fracture simulation with boundary elements for computer graphics,” Institute of Science and Technology Austria, 2017.","short":"D. Hahn, Brittle Fracture Simulation with Boundary Elements for Computer Graphics, Institute of Science and Technology Austria, 2017.","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","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."},"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425"}],"page":"124","date_published":"2017-08-14T00:00:00Z","doi":"10.15479/AT:ISTA:th_855","date_created":"2018-12-11T11:48:47Z","has_accepted_license":"1","year":"2017","day":"14","publisher":"Institute of Science and Technology Austria","oa":1,"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"},{"has_accepted_license":"1","datarep_id":"73","year":"2017","file":[{"content_type":"application/zip","access_level":"open_access","relation":"main_file","checksum":"2323a755842a3399cbc47d76545fc9a0","file_id":"5615","date_updated":"2020-07-14T12:47:04Z","file_size":199353471,"creator":"system","date_created":"2018-12-12T13:02:57Z","file_name":"IST-2017-73-v1+1_FractureRB_v1.1_2017_07_20_final_public.zip"}],"day":"16","related_material":{"record":[{"id":"839","status":"public","relation":"research_paper"}]},"date_published":"2017-08-16T00:00:00Z","doi":"10.15479/AT:ISTA:73","ec_funded":1,"date_created":"2018-12-12T12:31:35Z","abstract":[{"lang":"eng","text":"Includes source codes, test cases, and example data used in the thesis Brittle Fracture Simulation with Boundary Elements for Computer Graphics. 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)"}],"oa_version":"Published Version","publisher":"Institute of Science and Technology Austria","oa":1,"month":"08","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.","ieee":"D. Hahn, “Source codes: Brittle fracture simulation with boundary elements for computer graphics.” Institute of Science and Technology Austria, 2017.","short":"D. Hahn, (2017).","ama":"Hahn D. Source codes: Brittle fracture simulation with boundary elements for computer graphics. 2017. doi:10.15479/AT:ISTA:73","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"},"date_updated":"2024-02-21T13:48:02Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","ddc":["004"],"author":[{"full_name":"Hahn, David","last_name":"Hahn","first_name":"David","id":"357A6A66-F248-11E8-B48F-1D18A9856A87"}],"article_processing_charge":"No","department":[{"_id":"ChWo"}],"title":"Source codes: Brittle fracture simulation with boundary elements for computer graphics","file_date_updated":"2020-07-14T12:47:04Z","_id":"5568","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)"},"project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425"}],"status":"public","keyword":["Boundary elements","brittle fracture","computer graphics","fracture simulation"]},{"title":"Space-time sculpting of liquid animation","article_processing_charge":"No","author":[{"first_name":"Pierre","full_name":"Manteaux, Pierre","last_name":"Manteaux"},{"last_name":"Vimont","full_name":"Vimont, Ulysse","first_name":"Ulysse"},{"orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Rohmer, Damien","last_name":"Rohmer","first_name":"Damien"},{"last_name":"Cani","full_name":"Cani, Marie","first_name":"Marie"}],"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.","short":"P. Manteaux, U. Vimont, C. Wojtan, D. Rohmer, M. Cani, in:, Proceedings of the 9th International Conference on Motion in Games , ACM, 2016.","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.","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."},"project":[{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425"}],"article_number":"2994261","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","oa":1,"publisher":"ACM","quality_controlled":"1","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).","department":[{"_id":"ChWo"}],"ddc":["004"],"date_updated":"2023-02-21T09:49:49Z","status":"public","conference":{"start_date":"2016-10-10","location":"San Francisco, CA, USA","end_date":"2016-10-12","name":"MIG: Motion in Games"},"type":"conference","_id":"1136","ec_funded":1,"language":[{"iso":"eng"}],"publication_status":"published","month":"10","main_file_link":[{"url":"https://hal.inria.fr/hal-01367181","open_access":"1"}],"scopus_import":"1","oa_version":"Submitted Version","abstract":[{"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).","lang":"eng"}]},{"date_created":"2018-12-11T11:50:22Z","volume":17,"date_published":"2016-11-01T00:00:00Z","doi":"10.1016/j.jocs.2016.03.004","issue":"1","page":"249 - 260","language":[{"iso":"eng"}],"publication":"Journal of Computational Science","day":"01","year":"2016","publication_status":"published","intvolume":" 17","month":"11","quality_controlled":"1","publisher":"Elsevier","scopus_import":1,"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.","oa_version":"None","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."}],"title":"Hierarchic genetic strategy with maturing as a generic tool for multiobjective optimization","department":[{"_id":"ChWo"}],"publist_id":"6217","author":[{"last_name":"Łazarz","full_name":"Łazarz, Radosław","first_name":"Radosław"},{"last_name":"Idzik","full_name":"Idzik, Michał","first_name":"Michał"},{"first_name":"Konrad","full_name":"Gądek, Konrad","last_name":"Gądek"},{"first_name":"Ewa P","id":"47794CF0-F248-11E8-B48F-1D18A9856A87","last_name":"Gajda-Zagorska","full_name":"Gajda-Zagorska, Ewa P"}],"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","date_updated":"2021-01-12T06:48:35Z","citation":{"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","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.","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.","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.","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."},"status":"public","type":"journal_article","_id":"1141"},{"project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425"}],"article_number":"96","publist_id":"5879","author":[{"last_name":"Bojsen-Hansen","orcid":"0000-0002-4417-3224","full_name":"Bojsen-Hansen, Morten","id":"439F0C8C-F248-11E8-B48F-1D18A9856A87","first_name":"Morten"},{"last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"title":"Generalized non-reflecting boundaries for fluid re-simulation","citation":{"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.","ista":"Bojsen-Hansen M, Wojtan C. 2016. Generalized non-reflecting boundaries for fluid re-simulation. ACM SIGGRAPH, ACM Transactions on Graphics, vol. 35, 96.","mla":"Bojsen-Hansen, Morten, and Chris Wojtan. Generalized Non-Reflecting Boundaries for Fluid Re-Simulation. Vol. 35, no. 4, 96, ACM, 2016, doi:10.1145/2897824.2925963.","apa":"Bojsen-Hansen, M., & Wojtan, C. (2016). Generalized non-reflecting boundaries for fluid re-simulation (Vol. 35). Presented at the ACM SIGGRAPH, Anaheim, CA, USA: ACM. https://doi.org/10.1145/2897824.2925963","ama":"Bojsen-Hansen M, Wojtan C. Generalized non-reflecting boundaries for fluid re-simulation. In: Vol 35. ACM; 2016. doi: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."},"user_id":"4435EBFC-F248-11E8-B48F-1D18A9856A87","quality_controlled":"1","publisher":"ACM","oa":1,"acknowledgement":"We thank the IST Austria Visual Computing group for helpful feedback throughout the project. ","doi":"10.1145/2897824.2925963","date_published":"2016-07-11T00:00:00Z","date_created":"2018-12-11T11:51:35Z","has_accepted_license":"1","year":"2016","day":"11","type":"conference","conference":{"location":"Anaheim, CA, USA","end_date":"2016-07-28","start_date":"2016-07-24","name":"ACM SIGGRAPH"},"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","pubrep_id":"631","_id":"1363","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:44:47Z","date_updated":"2023-02-21T10:36:12Z","ddc":["000"],"alternative_title":["ACM Transactions on Graphics"],"month":"07","intvolume":" 35","abstract":[{"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.","lang":"eng"}],"acknowledged_ssus":[{"_id":"ScienComp"}],"oa_version":"Published Version","volume":35,"issue":"4","license":"https://creativecommons.org/licenses/by/4.0/","ec_funded":1,"publication_status":"published","file":[{"file_size":12422760,"date_updated":"2020-07-14T12:44:47Z","creator":"system","file_name":"IST-2016-631-v1+2_a96-bojsen-hansen.pdf","date_created":"2018-12-12T10:13:00Z","content_type":"application/pdf","relation":"main_file","access_level":"open_access","file_id":"4981","checksum":"140b5532f0a2a006a0149cab7c73c17c"}],"language":[{"iso":"eng"}]},{"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","quality_controlled":"1","publisher":"ACM","oa":1,"citation":{"ista":"Da F, Hahn D, Batty C, Wojtan C, Grinspun E. 2016. Surface only liquids. ACM SIGGRAPH, ACM Transactions on Graphics, vol. 35, a78.","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.","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.","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","ama":"Da F, Hahn D, Batty C, Wojtan C, Grinspun E. Surface only liquids. In: Vol 35. ACM; 2016. doi:10.1145/2897824.2925899","mla":"Da, Fang, et al. Surface Only Liquids. Vol. 35, no. 4, a78, ACM, 2016, doi:10.1145/2897824.2925899."},"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","publist_id":"5881","author":[{"first_name":"Fang","full_name":"Da, Fang","last_name":"Da"},{"id":"357A6A66-F248-11E8-B48F-1D18A9856A87","first_name":"David","last_name":"Hahn","full_name":"Hahn, David"},{"last_name":"Batty","full_name":"Batty, Christopher","first_name":"Christopher"},{"orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"},{"first_name":"Eitan","full_name":"Grinspun, Eitan","last_name":"Grinspun"}],"title":"Surface only liquids","article_number":"a78","project":[{"_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"}],"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,"abstract":[{"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.","lang":"eng"}],"oa_version":"Published Version","scopus_import":1,"alternative_title":["ACM Transactions on Graphics"],"month":"07","intvolume":" 35","date_updated":"2023-02-21T10:36:07Z","ddc":["000"],"file_date_updated":"2020-07-14T12:44:46Z","department":[{"_id":"ChWo"}],"_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"},{"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","citation":{"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.","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.","ista":"Goldade R, Batty C, Wojtan C. 2016. A practical method for high-resolution embedded liquid surfaces. Computer Graphics Forum. 35(2), 233–242.","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."},"title":"A practical method for high-resolution embedded liquid surfaces","publist_id":"5795","author":[{"first_name":"Ryan","full_name":"Goldade, Ryan","last_name":"Goldade"},{"first_name":"Christopher","last_name":"Batty","full_name":"Batty, Christopher"},{"full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"project":[{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425"}],"day":"27","publication":"Computer Graphics Forum","has_accepted_license":"1","year":"2016","doi":"10.1111/cgf.12826","date_published":"2016-05-27T00:00:00Z","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,"ddc":["000"],"date_updated":"2023-02-21T10:38:30Z","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:44:53Z","_id":"1412","status":"public","pubrep_id":"612","type":"journal_article","file":[{"file_id":"5000","checksum":"8e61387ee2e3bd0e776fbe301629bfd9","access_level":"open_access","relation":"main_file","content_type":"application/pdf","date_created":"2018-12-12T10:13:18Z","file_name":"IST-2016-612-v1+2_Wojtan_APracticalMethod_PostPrint_2016.pdf","creator":"system","date_updated":"2020-07-14T12:44:53Z","file_size":15873858}],"language":[{"iso":"eng"}],"publication_status":"published","issue":"2","volume":35,"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},{"department":[{"_id":"ChWo"}],"title":"Generalized diffusion curves: An improved vector representation for smooth-shaded images","author":[{"full_name":"Jeschke, Stefan","last_name":"Jeschke","first_name":"Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87"}],"publist_id":"5794","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","date_updated":"2021-01-12T06:50:34Z","citation":{"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","short":"S. Jeschke, Computer Graphics Forum 35 (2016) 71–79.","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.","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.","ista":"Jeschke S. 2016. Generalized diffusion curves: An improved vector representation for smooth-shaded images. Computer Graphics Forum. 35(2), 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."},"status":"public","project":[{"grant_number":"P 24352-N23","name":"Deep Pictures: Creating Visual and Haptic Vector Images","_id":"25357BD2-B435-11E9-9278-68D0E5697425","call_identifier":"FWF"}],"type":"journal_article","_id":"1413","doi":"10.1111/cgf.12812","volume":35,"issue":"2","date_published":"2016-05-01T00:00:00Z","date_created":"2018-12-11T11:51:53Z","page":"71 - 79","day":"01","language":[{"iso":"eng"}],"publication":"Computer Graphics Forum","publication_status":"published","year":"2016","month":"05","intvolume":" 35","quality_controlled":"1","scopus_import":1,"publisher":"Wiley-Blackwell","oa_version":"None","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."}]},{"citation":{"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.","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.","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","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","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.","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."},"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","author":[{"last_name":"Ferstl","full_name":"Ferstl, Florian","first_name":"Florian"},{"first_name":"Ryoichi","last_name":"Ando","full_name":"Ando, Ryoichi"},{"first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan"},{"first_name":"Rüdiger","full_name":"Westermann, Rüdiger","last_name":"Westermann"},{"last_name":"Thuerey","full_name":"Thuerey, Nils","first_name":"Nils"}],"publist_id":"5793","title":"Narrow band FLIP for liquid simulations","oa":1,"quality_controlled":"1","publisher":"Wiley-Blackwell","year":"2016","has_accepted_license":"1","publication":"Computer Graphics Forum","day":"01","page":"225 - 232","date_created":"2018-12-11T11:51:53Z","doi":"10.1111/cgf.12825","date_published":"2016-05-01T00:00:00Z","_id":"1415","type":"journal_article","pubrep_id":"611","status":"public","date_updated":"2023-02-21T10:38:38Z","ddc":["000"],"file_date_updated":"2020-07-14T12:44:53Z","department":[{"_id":"ChWo"}],"abstract":[{"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.","lang":"eng"}],"oa_version":"Submitted Version","scopus_import":1,"intvolume":" 35","month":"05","publication_status":"published","language":[{"iso":"eng"}],"file":[{"file_id":"4940","checksum":"984afbe510ed48019025dff1dcc7baad","access_level":"open_access","relation":"main_file","content_type":"application/pdf","date_created":"2018-12-12T10:12:22Z","file_name":"IST-2016-611-v1+3_CW_nbflip_postprint_2016.pdf","creator":"system","date_updated":"2020-07-14T12:44:53Z","file_size":5938324}],"volume":35,"issue":"2"},{"citation":{"ama":"Hahn D, Wojtan C. Fast approximations for boundary element based brittle fracture simulation. In: Vol 35. ACM; 2016. doi:10.1145/2897824.2925902","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","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.","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."},"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","author":[{"first_name":"David","id":"357A6A66-F248-11E8-B48F-1D18A9856A87","last_name":"Hahn","full_name":"Hahn, David"},{"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":"5880","title":"Fast approximations for boundary element based brittle fracture simulation","article_number":"104","project":[{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"year":"2016","has_accepted_license":"1","day":"01","date_created":"2018-12-11T11:51:35Z","date_published":"2016-07-01T00:00:00Z","doi":"10.1145/2897824.2925902","oa":1,"publisher":"ACM","quality_controlled":"1","date_updated":"2023-09-07T12:02:56Z","ddc":["000"],"department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:44:46Z","_id":"1362","conference":{"name":"ACM SIGGRAPH","start_date":"2016-07-24","location":"Anaheim, CA, USA","end_date":"2016-07-28"},"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)"},"type":"conference","pubrep_id":"632","status":"public","publication_status":"published","language":[{"iso":"eng"}],"file":[{"file_size":12453704,"date_updated":"2020-07-14T12:44:46Z","creator":"system","file_name":"IST-2016-632-v1+2_a104-hahn.pdf","date_created":"2018-12-12T10:15:04Z","content_type":"application/pdf","relation":"main_file","access_level":"open_access","checksum":"943712d9c9dc8bb5048d4adc561d7d38","file_id":"5121"}],"ec_funded":1,"issue":"4","related_material":{"record":[{"id":"839","status":"public","relation":"dissertation_contains"}]},"volume":35,"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."}],"oa_version":"Published Version","alternative_title":["ACM Transactions on Graphics"],"intvolume":" 35","month":"07"},{"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. ","oa":1,"publisher":"Institute of Science and Technology Austria","year":"2016","has_accepted_license":"1","day":"15","page":"114","date_created":"2018-12-11T11:50:16Z","date_published":"2016-07-15T00:00:00Z","doi":"10.15479/AT:ISTA:th_640","citation":{"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.","short":"M. Bojsen-Hansen, Tracking, Correcting and Absorbing Water Surface Waves, Institute of Science and Technology Austria, 2016.","ieee":"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."},"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","article_processing_charge":"No","publist_id":"6238","author":[{"last_name":"Bojsen-Hansen","orcid":"0000-0002-4417-3224","full_name":"Bojsen-Hansen, Morten","id":"439F0C8C-F248-11E8-B48F-1D18A9856A87","first_name":"Morten"}],"title":"Tracking, correcting and absorbing water surface waves","abstract":[{"lang":"eng","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."}],"oa_version":"Published Version","alternative_title":["ISTA Thesis"],"month":"07","publication_status":"published","degree_awarded":"PhD","publication_identifier":{"issn":["2663-337X"]},"language":[{"iso":"eng"}],"file":[{"date_created":"2018-12-12T10:13:02Z","file_name":"IST-2016-640-v1+1_2016_Bojsen-Hansen_TCaAWSW.pdf","creator":"system","date_updated":"2018-12-12T10:13:02Z","file_size":13869345,"file_id":"4982","access_level":"open_access","relation":"main_file","content_type":"application/pdf"}],"related_material":{"record":[{"id":"5558","status":"public","relation":"other"}]},"_id":"1122","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)"},"type":"dissertation","status":"public","date_updated":"2024-02-21T13:50:48Z","supervisor":[{"first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546"}],"ddc":["004","005","006","532","621"],"file_date_updated":"2018-12-12T10:13:02Z","department":[{"_id":"ChWo"}]},{"_id":"5558","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)"},"status":"public","pubrep_id":"640","date_updated":"2024-02-21T13:50:48Z","citation":{"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.","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","ieee":"M. Bojsen-Hansen, “Tracking, Correcting and Absorbing Water Surface Waves.” Institute of Science and Technology Austria, 2016.","short":"M. Bojsen-Hansen, (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."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","ddc":["004"],"author":[{"full_name":"Bojsen-Hansen, Morten","orcid":"0000-0002-4417-3224","last_name":"Bojsen-Hansen","first_name":"Morten","id":"439F0C8C-F248-11E8-B48F-1D18A9856A87"}],"publist_id":"6238","article_processing_charge":"No","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:47:02Z","title":"Tracking, Correcting and Absorbing Water Surface Waves","abstract":[{"lang":"eng","text":"PhD thesis LaTeX source code"}],"oa_version":"Published Version","publisher":"Institute of Science and Technology Austria","oa":1,"month":"09","has_accepted_license":"1","datarep_id":"48","year":"2016","file":[{"date_created":"2018-12-12T13:02:18Z","file_name":"IST-2016-48-v1+1_2016_Bojsen-Hansen_TCaAWSW.tar.bz2","creator":"system","date_updated":"2020-07-14T12:47:02Z","file_size":55237885,"file_id":"5589","checksum":"5b1b256ad796fbddb4b7729f5e45e444","access_level":"open_access","relation":"main_file","content_type":"application/x-bzip2"}],"day":"23","doi":"10.15479/AT:ISTA:48","date_published":"2016-09-23T00:00:00Z","related_material":{"record":[{"relation":"other","status":"public","id":"1122"}]},"date_created":"2018-12-12T12:31:31Z"},{"issue":"4","volume":34,"ec_funded":1,"publication_status":"published","file":[{"date_created":"2018-12-12T10:11:14Z","file_name":"IST-2016-608-v1+1_doublebubbles.pdf","date_updated":"2020-07-14T12:45:07Z","file_size":8973215,"creator":"system","checksum":"57b07d78d2d612a8052744b37d4a71fa","file_id":"4867","content_type":"application/pdf","access_level":"open_access","relation":"main_file"}],"language":[{"iso":"eng"}],"scopus_import":1,"month":"07","intvolume":" 34","abstract":[{"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.","lang":"eng"}],"oa_version":"Submitted Version","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:45:07Z","date_updated":"2023-02-23T10:07:42Z","ddc":["000"],"type":"conference","conference":{"start_date":"2015-08-09","location":"Los Angeles, CA, United States","end_date":"2015-08-13","name":"SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques"},"status":"public","pubrep_id":"608","_id":"1634","date_published":"2015-07-27T00:00:00Z","doi":"10.1145/2767003","date_created":"2018-12-11T11:53:09Z","has_accepted_license":"1","year":"2015","day":"27","quality_controlled":"1","publisher":"ACM","oa":1,"publist_id":"5521","author":[{"full_name":"Da, Fang","last_name":"Da","first_name":"Fang"},{"full_name":"Batty, Christopher","last_name":"Batty","first_name":"Christopher"},{"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":"Grinspun, Eitan","last_name":"Grinspun","first_name":"Eitan"}],"title":"Double bubbles sans toil and trouble: discrete circulation-preserving vortex sheets for soap films and foams","citation":{"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.","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.","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","short":"F. Da, C. Batty, C. Wojtan, E. Grinspun, in:, ACM, 2015.","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.","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."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","project":[{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425"}],"article_number":"149"},{"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.","oa":1,"quality_controlled":"1","publisher":"ACM","year":"2015","has_accepted_license":"1","day":"27","date_created":"2018-12-11T11:53:09Z","doi":"10.1145/2766935","date_published":"2015-07-27T00:00:00Z","article_number":"53","citation":{"mla":"Ando, Ryoichi, et al. A Stream Function Solver for Liquid Simulations. Vol. 34, no. 4, 53, ACM, 2015, doi:10.1145/2766935.","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","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.","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."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"last_name":"Ando","full_name":"Ando, Ryoichi","first_name":"Ryoichi"},{"first_name":"Nils","full_name":"Thuerey, Nils","last_name":"Thuerey"},{"last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"publist_id":"5523","title":"A stream function solver for liquid simulations","abstract":[{"lang":"eng","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."}],"oa_version":"Submitted Version","scopus_import":1,"alternative_title":["ACM Transactions on Graphics"],"intvolume":" 34","month":"07","publication_status":"published","language":[{"iso":"eng"}],"file":[{"checksum":"7a9afdfaba9209157ce19376e15bc90b","file_id":"4909","access_level":"open_access","relation":"main_file","content_type":"application/pdf","date_created":"2018-12-12T10:11:52Z","file_name":"IST-2016-610-v1+1_vecpotential.pdf","creator":"system","date_updated":"2020-07-14T12:45:07Z","file_size":21831121}],"issue":"4","volume":34,"_id":"1632","conference":{"name":"SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques","start_date":"2015-08-09","end_date":"2015-08-13","location":"Los Angeles, CA, USA"},"type":"conference","pubrep_id":"610","status":"public","date_updated":"2023-02-23T10:07:37Z","ddc":["000"],"file_date_updated":"2020-07-14T12:45:07Z","department":[{"_id":"ChWo"}]},{"day":"27","has_accepted_license":"1","year":"2015","doi":"10.1145/2766933","date_published":"2015-07-27T00:00:00Z","date_created":"2018-12-11T11:53:08Z","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).","publisher":"ACM","quality_controlled":"1","oa":1,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"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","short":"P. Guerrero, S. Jeschke, M. Wimmer, P. Wonka, in:, ACM, 2015.","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.","mla":"Guerrero, Paul, et al. Learning Shape Placements by Example. Vol. 34, no. 4, 108, ACM, 2015, doi: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.","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."},"title":"Learning shape placements by example","publist_id":"5525","author":[{"last_name":"Guerrero","full_name":"Guerrero, Paul","first_name":"Paul"},{"id":"44D6411A-F248-11E8-B48F-1D18A9856A87","first_name":"Stefan","last_name":"Jeschke","full_name":"Jeschke, Stefan"},{"full_name":"Wimmer, Michael","last_name":"Wimmer","first_name":"Michael"},{"last_name":"Wonka","full_name":"Wonka, Peter","first_name":"Peter"}],"article_number":"108","project":[{"call_identifier":"FWF","_id":"25357BD2-B435-11E9-9278-68D0E5697425","grant_number":"P 24352-N23","name":"Deep Pictures: Creating Visual and Haptic Vector Images"}],"file":[{"date_created":"2018-12-12T10:07:49Z","file_name":"IST-2016-576-v1+1_guerrero-2015-lsp-paper.pdf","creator":"system","date_updated":"2020-07-14T12:45:07Z","file_size":11902290,"file_id":"4647","checksum":"8b05a51e372c9b0b5af9a00098a9538b","access_level":"open_access","relation":"main_file","content_type":"application/pdf"}],"language":[{"iso":"eng"}],"publication_status":"published","issue":"4","volume":34,"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."}],"month":"07","intvolume":" 34","scopus_import":1,"ddc":["000"],"date_updated":"2021-01-12T06:52:07Z","file_date_updated":"2020-07-14T12:45:07Z","department":[{"_id":"ChWo"}],"_id":"1630","status":"public","pubrep_id":"576","type":"conference","conference":{"start_date":"2015-08-09","location":"Los Angeles, CA, United States","end_date":"2015-08-13","name":"SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques"}},{"file":[{"creator":"system","file_size":6312352,"date_updated":"2020-07-14T12:45:15Z","file_name":"IST-2016-607-v1+1_coarsegrid.pdf","date_created":"2018-12-12T10:16:30Z","relation":"main_file","access_level":"open_access","content_type":"application/pdf","file_id":"5218","checksum":"590752bf977855b337a80f78a9bc2404"}],"language":[{"iso":"eng"}],"publication_status":"published","volume":34,"issue":"2","oa_version":"Submitted Version","abstract":[{"lang":"eng","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."}],"month":"05","intvolume":" 34","scopus_import":1,"ddc":["000"],"date_updated":"2023-02-23T10:12:11Z","file_date_updated":"2020-07-14T12:45:15Z","department":[{"_id":"ChWo"}],"_id":"1735","status":"public","pubrep_id":"607","type":"journal_article","day":"01","publication":"Computer Graphics Forum","has_accepted_license":"1","year":"2015","doi":"10.1111/cgf.12576","date_published":"2015-05-01T00:00:00Z","date_created":"2018-12-11T11:53:44Z","page":"473 - 480","acknowledgement":"The first author was supported by a JSPS Postdoctoral Fellowship for Research Abroad","publisher":"Wiley","quality_controlled":"1","oa":1,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"ista":"Ando R, Thürey N, Wojtan C. 2015. A dimension-reduced pressure solver for liquid simulations. Computer Graphics Forum. 34(2), 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.","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.","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","ama":"Ando R, Thürey N, Wojtan C. A dimension-reduced pressure solver for liquid simulations. 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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."}],"title":"Water wave animation via wavefront parameter interpolation","author":[{"first_name":"Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87","full_name":"Jeschke, Stefan","last_name":"Jeschke"},{"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":"5292","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"ista":"Jeschke S, Wojtan C. 2015. Water wave animation via wavefront parameter interpolation. ACM Transactions on Graphics. 34(3), 27.","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.","ieee":"S. Jeschke and C. Wojtan, “Water wave animation via wavefront parameter interpolation,” ACM Transactions on Graphics, vol. 34, no. 3. ACM, 2015.","short":"S. Jeschke, C. Wojtan, ACM Transactions on Graphics 34 (2015).","apa":"Jeschke, S., & Wojtan, C. (2015). Water wave animation via wavefront parameter interpolation. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/2714572","ama":"Jeschke S, Wojtan C. Water wave animation via wavefront parameter interpolation. 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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.","ama":"Hahn D, Wojtan C. High-resolution brittle fracture simulation with boundary elements. In: Vol 34. ACM; 2015. doi:10.1145/2766896","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","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.","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."},"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":"151","date_created":"2018-12-11T11:53:09Z","date_published":"2015-07-27T00:00:00Z","doi":"10.1145/2766896","day":"27","year":"2015","has_accepted_license":"1","oa":1,"quality_controlled":"1","publisher":"ACM","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:45:07Z","ddc":["000"],"date_updated":"2023-09-07T12:02:56Z","pubrep_id":"609","status":"public","conference":{"start_date":"2015-08-09","end_date":"2015-08-13","location":"Los Angeles, CA, United States","name":"SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques"},"type":"conference","_id":"1633","ec_funded":1,"volume":34,"related_material":{"record":[{"status":"public","id":"839","relation":"dissertation_contains"}]},"issue":"4","language":[{"iso":"eng"}],"file":[{"file_name":"IST-2016-609-v1+1_FractureBEM.pdf","date_created":"2018-12-12T10:15:13Z","file_size":20154270,"date_updated":"2020-07-14T12:45:07Z","creator":"system","file_id":"5131","checksum":"955aee971983f6b6152bcc1c9b4a7c20","content_type":"application/pdf","relation":"main_file","access_level":"open_access"}],"publication_status":"published","intvolume":" 34","month":"07","scopus_import":1,"oa_version":"Submitted Version","abstract":[{"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.","lang":"eng"}]},{"citation":{"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.","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. 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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."}],"oa_version":"Submitted Version","intvolume":" 33","month":"03"},{"citation":{"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. 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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."}],"oa_version":"Submitted Version","scopus_import":1,"month":"11","intvolume":" 34","publication_status":"published","file":[{"content_type":"application/pdf","access_level":"open_access","relation":"main_file","file_id":"5182","checksum":"91946bfc509c77f5fd3151a3ff2b2c8f","date_updated":"2020-07-14T12:45:19Z","file_size":24817484,"creator":"system","date_created":"2018-12-12T10:15:58Z","file_name":"IST-2016-574-v1+1_Guerrero-2014-TPS-paper.pdf"}],"language":[{"iso":"eng"}],"volume":34,"issue":"1"},{"scopus_import":1,"intvolume":" 20","month":"09","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","language":[{"iso":"eng"}],"file":[{"access_level":"open_access","relation":"main_file","content_type":"application/pdf","checksum":"5bf58942d2eb20adf03c7f9ea2e68124","file_id":"5297","creator":"system","date_updated":"2020-07-14T12:45:20Z","file_size":13594598,"date_created":"2018-12-12T10:17:41Z","file_name":"IST-2016-573-v1+1_arikan-2014-pcvis-draft.pdf"}],"type":"journal_article","pubrep_id":"573","status":"public","_id":"1906","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:45:20Z","date_updated":"2021-01-12T06:53:59Z","ddc":["000"],"oa":1,"publisher":"IEEE","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","date_created":"2018-12-11T11:54:39Z","doi":"10.1109/TVCG.2014.2312011","date_published":"2014-09-09T00:00:00Z","year":"2014","has_accepted_license":"1","publication":"IEEE Transactions on Visualization and Computer Graphics","day":"09","project":[{"name":"Deep Pictures: Creating Visual and Haptic Vector Images","grant_number":"P 24352-N23","_id":"25357BD2-B435-11E9-9278-68D0E5697425","call_identifier":"FWF"}],"author":[{"first_name":"Murat","full_name":"Arikan, Murat","last_name":"Arikan"},{"first_name":"Reinhold","last_name":"Preiner","full_name":"Preiner, Reinhold"},{"full_name":"Scheiblauer, Claus","last_name":"Scheiblauer","first_name":"Claus"},{"full_name":"Jeschke, Stefan","last_name":"Jeschke","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":{"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.","apa":"Arikan, M., Preiner, R., Scheiblauer, C., Jeschke, S., & Wimmer, M. 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Wimmer, IEEE Transactions on Visualization and Computer Graphics 20 (2014) 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.","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."},"user_id":"4435EBFC-F248-11E8-B48F-1D18A9856A87"},{"article_number":"137","project":[{"_id":"25636330-B435-11E9-9278-68D0E5697425","grant_number":"11-NSF-1070","name":"ROOTS Genome-wide Analysis of Root Traits"}],"citation":{"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.","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","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","mla":"Raveendran, Karthik, et al. “Blending Liquids.” ACM Transactions on Graphics, vol. 33, no. 4, 137, ACM, 2014, doi:10.1145/2601097.2601126.","ista":"Raveendran K, Wojtan C, Thuerey N, Türk G. 2014. Blending liquids. ACM Transactions on Graphics. 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ACM, 2014. https://doi.org/10.1145/2601097.2601126."},"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","author":[{"first_name":"Karthik","last_name":"Raveendran","full_name":"Raveendran, Karthik"},{"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":"Nils","full_name":"Thuerey, Nils","last_name":"Thuerey"},{"last_name":"Türk","full_name":"Türk, Greg","first_name":"Greg"}],"publist_id":"4988","article_processing_charge":"No","title":"Blending liquids","publisher":"ACM","quality_controlled":"1","oa":1,"has_accepted_license":"1","year":"2014","day":"01","publication":"ACM Transactions on Graphics","date_published":"2014-07-01T00:00:00Z","doi":"10.1145/2601097.2601126","date_created":"2018-12-11T11:55:28Z","_id":"2058","type":"conference","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"},"status":"public","pubrep_id":"606","date_updated":"2022-08-25T14:02:46Z","ddc":["000"],"department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:45:27Z","abstract":[{"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.","lang":"eng"}],"oa_version":"Submitted Version","scopus_import":"1","month":"07","intvolume":" 33","publication_status":"published","file":[{"file_id":"4688","checksum":"1752760a2e71e254537f31c0d10d9c6c","content_type":"application/pdf","access_level":"open_access","relation":"main_file","date_created":"2018-12-12T10:08:27Z","file_name":"IST-2016-606-v1+1_BlendingLiquids-Preprint.pdf","date_updated":"2020-07-14T12:45:27Z","file_size":8387384,"creator":"system"}],"language":[{"iso":"eng"}],"issue":"4","volume":33},{"doi":"10.1145/2461912.2461982","date_published":"2013-07-01T00:00:00Z","date_created":"2018-12-11T11:57:50Z","has_accepted_license":"1","year":"2013","day":"01","publication":"ACM Transactions on Graphics","quality_controlled":"1","publisher":"ACM","oa":1,"publist_id":"4436","author":[{"full_name":"Ando, Ryoichi","last_name":"Ando","first_name":"Ryoichi"},{"first_name":"Nils","full_name":"Thuerey, Nils","last_name":"Thuerey"},{"last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"title":"Highly adaptive liquid simulations on tetrahedral meshes","citation":{"ista":"Ando R, Thuerey N, Wojtan C. 2013. Highly adaptive liquid simulations on tetrahedral meshes. ACM Transactions on Graphics. 32(4), 103.","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.","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.","short":"R. Ando, N. Thuerey, C. Wojtan, ACM Transactions on Graphics 32 (2013).","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","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."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_number":"103","volume":32,"issue":"4","publication_status":"published","file":[{"access_level":"open_access","relation":"main_file","content_type":"application/pdf","checksum":"aeea6b0ff2b27c695aeb8408c7d2fc50","file_id":"5279","creator":"system","date_updated":"2020-07-14T12:45:41Z","file_size":8601561,"date_created":"2018-12-12T10:17:25Z","file_name":"IST-2016-605-v1+1_tetflip_fixed.pdf"}],"language":[{"iso":"eng"}],"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","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:45:41Z","date_updated":"2023-02-23T10:44:14Z","ddc":["000"],"type":"journal_article","status":"public","pubrep_id":"605","_id":"2466"},{"_id":"2467","pubrep_id":"604","status":"public","type":"journal_article","ddc":["000"],"date_updated":"2023-02-23T10:44:16Z","file_date_updated":"2020-07-14T12:45:41Z","department":[{"_id":"ChWo"}],"oa_version":"Submitted Version","abstract":[{"lang":"eng","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."}],"intvolume":" 32","month":"07","scopus_import":1,"language":[{"iso":"eng"}],"file":[{"file_id":"4768","checksum":"9c8425d62246996ca632c5a01870515b","relation":"main_file","access_level":"open_access","content_type":"application/pdf","file_name":"IST-2016-604-v1+1_toptop2013.pdf","date_created":"2018-12-12T10:09:43Z","creator":"system","file_size":3514674,"date_updated":"2020-07-14T12:45:41Z"}],"publication_status":"published","issue":"4","volume":32,"article_number":"34","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","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.","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","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","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.","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."},"title":"Putting holes in holey geometry: Topology change for arbitrary surfaces","publist_id":"4435","author":[{"first_name":"Gilbert","full_name":"Bernstein, Gilbert","last_name":"Bernstein"},{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan"}],"oa":1,"publisher":"ACM","quality_controlled":"1","publication":"ACM Transactions on Graphics","day":"01","year":"2013","has_accepted_license":"1","date_created":"2018-12-11T11:57:50Z","date_published":"2013-07-01T00:00:00Z","doi":"10.1145/2461912.2462027"},{"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"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.","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","ama":"Bojsen-Hansen M, Wojtan C. Liquid surface tracking with error compensation. ACM Transactions on Graphics. 2013;32(4). doi:10.1145/2461912.2461991","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.","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.","ista":"Bojsen-Hansen M, Wojtan C. 2013. Liquid surface tracking with error compensation. ACM Transactions on Graphics. 32(4), 68."},"title":"Liquid surface tracking with error compensation","author":[{"first_name":"Morten","id":"439F0C8C-F248-11E8-B48F-1D18A9856A87","full_name":"Bojsen-Hansen, Morten","orcid":"0000-0002-4417-3224","last_name":"Bojsen-Hansen"},{"last_name":"Wojtan","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"publist_id":"4434","article_number":"68","day":"01","publication":"ACM Transactions on Graphics","has_accepted_license":"1","year":"2013","date_published":"2013-07-01T00:00:00Z","doi":"10.1145/2461912.2461991","date_created":"2018-12-11T11:57:50Z","quality_controlled":"1","publisher":"ACM","oa":1,"ddc":["000"],"date_updated":"2023-02-23T10:44:18Z","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:45:41Z","_id":"2468","status":"public","pubrep_id":"603","type":"journal_article","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"}],"language":[{"iso":"eng"}],"publication_status":"published","volume":32,"issue":"4","oa_version":"Submitted Version","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."}],"month":"07","intvolume":" 32","scopus_import":1},{"title":"Controlling liquids using meshes","author":[{"full_name":"Raveendran, Karthik","last_name":"Raveendran","first_name":"Karthik"},{"first_name":"Nils","full_name":"Thuerey, Nils","last_name":"Thuerey"},{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546"},{"last_name":"Turk","full_name":"Turk, Greg","first_name":"Greg"}],"publist_id":"3580","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","citation":{"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.","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."},"oa":1,"quality_controlled":"1","publisher":"ACM","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.","date_created":"2018-12-11T12:01:30Z","date_published":"2012-07-29T00:00:00Z","page":"255 - 264","publication":"Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation","day":"29","year":"2012","has_accepted_license":"1","pubrep_id":"600","status":"public","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"},"type":"conference","_id":"3119","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:46:00Z","ddc":["000"],"date_updated":"2023-02-23T11:13:07Z","month":"07","scopus_import":1,"oa_version":"Submitted Version","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"}],"related_material":{"link":[{"relation":"table_of_contents","url":"http://dl.acm.org/citation.cfm?id=2422393"}]},"language":[{"iso":"eng"}],"file":[{"checksum":"babda64c24cf90a4d05ae86d712bed08","file_id":"4877","access_level":"open_access","relation":"main_file","content_type":"application/pdf","date_created":"2018-12-12T10:11:23Z","file_name":"IST-2016-600-v1+1_ControllingLiquids_Preprint.pdf","creator":"system","date_updated":"2020-07-14T12:46:00Z","file_size":4939370}],"publication_status":"published"},{"file_date_updated":"2020-07-14T12:46:00Z","department":[{"_id":"ChWo"}],"ddc":["000"],"date_updated":"2022-05-24T08:21:11Z","status":"public","pubrep_id":"602","article_type":"original","type":"journal_article","_id":"3118","issue":"4","volume":31,"file":[{"date_updated":"2020-07-14T12:46:00Z","file_size":44538518,"creator":"system","date_created":"2018-12-12T10:18:37Z","file_name":"IST-2016-602-v1+1_topoReg.pdf","content_type":"application/pdf","access_level":"open_access","relation":"main_file","file_id":"5359","checksum":"1e219c5bf4e5552c1290c62eefa5cd60"}],"language":[{"iso":"eng"}],"publication_status":"published","month":"07","intvolume":" 31","scopus_import":"1","alternative_title":["SIGGRAPH"],"oa_version":"Submitted Version","abstract":[{"lang":"eng","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."}],"title":"Tracking surfaces with evolving topology","author":[{"id":"439F0C8C-F248-11E8-B48F-1D18A9856A87","first_name":"Morten","last_name":"Bojsen-Hansen","orcid":"0000-0002-4417-3224","full_name":"Bojsen-Hansen, Morten"},{"full_name":"Li, Hao","last_name":"Li","first_name":"Hao"},{"full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"publist_id":"3581","article_processing_charge":"No","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"ista":"Bojsen-Hansen M, Li H, Wojtan C. 2012. Tracking surfaces with evolving topology. ACM Transactions on Graphics. 31(4), 53.","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.","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","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","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.","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."},"article_number":"53","doi":"10.1145/2185520.2185549","date_published":"2012-07-01T00:00:00Z","date_created":"2018-12-11T12:01:29Z","day":"01","publication":"ACM Transactions on Graphics","has_accepted_license":"1","year":"2012","quality_controlled":"1","publisher":"ACM","oa":1,"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. "},{"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","date_published":"2012-05-01T00:00:00Z","doi":"10.1111/j.1467-8659.2012.03062.x","date_created":"2018-12-11T12:01:31Z","citation":{"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.","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","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.","short":"J. Yu, C. Wojtan, G. Turk, C. Yap, in:, Computer Graphics Forum, Wiley, 2012, pp. 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.","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."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"first_name":"Jihun","last_name":"Yu","full_name":"Yu, Jihun"},{"first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J","last_name":"Wojtan"},{"first_name":"Greg","last_name":"Turk","full_name":"Turk, Greg"},{"last_name":"Yap","full_name":"Yap, Chee","first_name":"Chee"}],"publist_id":"3576","article_processing_charge":"No","title":"Explicit mesh surfaces for particle based fluids","abstract":[{"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.","lang":"eng"}],"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":[{"file_id":"5092","checksum":"acb325dd1e31859bedd30e013f61d0b9","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"}],"issue":"2","volume":31,"_id":"3123","type":"conference","conference":{"start_date":"2012-05-13","end_date":"2012-05-18","location":"Cagliari, Sardinia, Italy","name":"EUROGRAPHICS: Conference on European Association for Computer Graphics"},"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"},{"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":[{"content_type":"application/pdf","access_level":"open_access","relation":"main_file","file_id":"4769","checksum":"6579d27709946e0eefbfa60a456b4913","date_updated":"2020-07-14T12:46:06Z","file_size":2536216,"creator":"system","date_created":"2018-12-12T10:09:44Z","file_name":"IST-2016-598-v1+1_HybridSPH_Preprint.pdf"}],"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"}],"title":"Hybrid smoothed particle hydrodynamics","editor":[{"full_name":"Spencer, Stephen","last_name":"Spencer","first_name":"Stephen"}],"publist_id":"3343","author":[{"first_name":"Karthik","full_name":"Raveendran, Karthik","last_name":"Raveendran"},{"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":"Greg","full_name":"Turk, Greg","last_name":"Turk"}],"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.","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","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.","short":"K. Raveendran, C. Wojtan, G. Turk, in:, S. Spencer (Ed.), ACM, 2011, pp. 33–42.","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."},"date_published":"2011-08-05T00:00:00Z","doi":"10.1145/2019406.2019411","date_created":"2018-12-11T12:02:32Z","page":"33 - 42","day":"05","has_accepted_license":"1","year":"2011","quality_controlled":"1","publisher":"ACM","oa":1},{"oa_version":"Published Version","abstract":[{"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.","lang":"eng"}],"month":"08","scopus_import":1,"file":[{"file_id":"5018","checksum":"8d508ad7c82f50978acbaa4170ee0a75","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"}],"publication_status":"published","_id":"3297","status":"public","pubrep_id":"599","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"},"ddc":["000"],"date_updated":"2023-02-23T11:21:02Z","file_date_updated":"2020-07-14T12:46:06Z","department":[{"_id":"ChWo"}],"quality_controlled":"1","publisher":"ACM","oa":1,"day":"07","has_accepted_license":"1","year":"2011","date_published":"2011-08-07T00:00:00Z","doi":"10.1145/2037636.2037644","date_created":"2018-12-11T12:02:31Z","article_number":"8","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","citation":{"mla":"Wojtan, Chris, et al. Liquid Simulation with Mesh-Based Surface Tracking. 8, ACM, 2011, doi:10.1145/2037636.2037644.","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.","short":"C. Wojtan, M. Müller Fischer, T. Brochu, in:, ACM, 2011.","ama":"Wojtan C, Müller Fischer M, Brochu T. Liquid simulation with mesh-based surface tracking. In: ACM; 2011. doi: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","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.","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."},"title":"Liquid simulation with mesh-based surface tracking","author":[{"first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","last_name":"Wojtan"},{"first_name":"Matthias","full_name":"Müller Fischer, Matthias","last_name":"Müller Fischer"},{"last_name":"Brochu","full_name":"Brochu, Tyson","first_name":"Tyson"}],"publist_id":"3344"}]