[{"publisher":"ACM","title":"Generalized non-reflecting boundaries for fluid re-simulation","quality_controlled":"1","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 &quot;non-reflecting&quot; 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"}],"file":[{"file_id":"4981","checksum":"140b5532f0a2a006a0149cab7c73c17c","content_type":"application/pdf","date_updated":"2020-07-14T12:44:47Z","file_name":"IST-2016-631-v1+2_a96-bojsen-hansen.pdf","file_size":12422760,"access_level":"open_access","creator":"system","relation":"main_file","date_created":"2018-12-12T10:13:00Z"}],"project":[{"_id":"2533E772-B435-11E9-9278-68D0E5697425","grant_number":"638176","name":"Big Splash: Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020"}],"date_updated":"2025-09-22T07:43:01Z","doi":"10.1145/2897824.2925963","status":"public","tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"oa":1,"date_created":"2018-12-11T11:51:35Z","date_published":"2016-07-11T00:00:00Z","_id":"1363","external_id":{"isi":["000380112400066"]},"acknowledged_ssus":[{"_id":"ScienComp"}],"year":"2016","publist_id":"5879","file_date_updated":"2020-07-14T12:44:47Z","article_processing_charge":"No","day":"11","type":"conference","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","has_accepted_license":"1","alternative_title":["ACM Transactions on Graphics"],"ec_funded":1,"article_number":"96","corr_author":"1","citation":{"ista":"Bojsen-Hansen M, Wojtan C. 2016. Generalized non-reflecting boundaries for fluid re-simulation. ACM SIGGRAPH, ACM Transactions on Graphics, vol. 35, 96.","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.","chicago":"Bojsen-Hansen, Morten, and Chris Wojtan. “Generalized Non-Reflecting Boundaries for Fluid Re-Simulation,” Vol. 35. ACM, 2016. <a href=\"https://doi.org/10.1145/2897824.2925963\">https://doi.org/10.1145/2897824.2925963</a>.","mla":"Bojsen-Hansen, Morten, and Chris Wojtan. <i>Generalized Non-Reflecting Boundaries for Fluid Re-Simulation</i>. Vol. 35, no. 4, 96, ACM, 2016, doi:<a href=\"https://doi.org/10.1145/2897824.2925963\">10.1145/2897824.2925963</a>.","short":"M. Bojsen-Hansen, C. Wojtan, in:, ACM, 2016.","ama":"Bojsen-Hansen M, Wojtan C. Generalized non-reflecting boundaries for fluid re-simulation. In: Vol 35. ACM; 2016. doi:<a href=\"https://doi.org/10.1145/2897824.2925963\">10.1145/2897824.2925963</a>","apa":"Bojsen-Hansen, M., &#38; Wojtan, C. (2016). Generalized non-reflecting boundaries for fluid re-simulation (Vol. 35). Presented at the ACM SIGGRAPH, Anaheim, CA, USA: ACM. <a href=\"https://doi.org/10.1145/2897824.2925963\">https://doi.org/10.1145/2897824.2925963</a>"},"issue":"4","pubrep_id":"631","language":[{"iso":"eng"}],"oa_version":"Published Version","intvolume":"        35","ddc":["000"],"scopus_import":"1","acknowledgement":"We thank the IST Austria Visual Computing group for helpful feedback throughout the project. ","isi":1,"publication_status":"published","author":[{"first_name":"Morten","id":"439F0C8C-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-4417-3224","last_name":"Bojsen-Hansen","full_name":"Bojsen-Hansen, Morten"},{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546"}],"department":[{"_id":"ChWo"}],"conference":{"end_date":"2016-07-28","start_date":"2016-07-24","location":"Anaheim, CA, USA","name":"ACM SIGGRAPH"},"month":"07","volume":35},{"quality_controlled":"1","title":"A practical method for high-resolution embedded liquid surfaces","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"}],"publisher":"Wiley-Blackwell","file":[{"date_updated":"2020-07-14T12:44:53Z","content_type":"application/pdf","file_id":"5000","checksum":"8e61387ee2e3bd0e776fbe301629bfd9","access_level":"open_access","file_size":15873858,"creator":"system","relation":"main_file","date_created":"2018-12-12T10:13:18Z","file_name":"IST-2016-612-v1+2_Wojtan_APracticalMethod_PostPrint_2016.pdf"}],"oa":1,"status":"public","date_updated":"2025-09-18T14:26:23Z","doi":"10.1111/cgf.12826","project":[{"grant_number":"638176","name":"Big Splash: Efficient Simulation of Natural Phenomena at Extremely Large Scales","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"publist_id":"5795","year":"2016","file_date_updated":"2020-07-14T12:44:53Z","date_created":"2018-12-11T11:51:52Z","external_id":{"isi":["000377222200022"]},"_id":"1412","date_published":"2016-05-27T00:00:00Z","type":"journal_article","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","publication":"Computer Graphics Forum","day":"27","article_processing_charge":"No","citation":{"ieee":"R. Goldade, C. Batty, and C. Wojtan, “A practical method for high-resolution embedded liquid surfaces,” <i>Computer Graphics Forum</i>, vol. 35, no. 2. Wiley-Blackwell, pp. 233–242, 2016.","chicago":"Goldade, Ryan, Christopher Batty, and Chris Wojtan. “A Practical Method for High-Resolution Embedded Liquid Surfaces.” <i>Computer Graphics Forum</i>. Wiley-Blackwell, 2016. <a href=\"https://doi.org/10.1111/cgf.12826\">https://doi.org/10.1111/cgf.12826</a>.","mla":"Goldade, Ryan, et al. “A Practical Method for High-Resolution Embedded Liquid Surfaces.” <i>Computer Graphics Forum</i>, vol. 35, no. 2, Wiley-Blackwell, 2016, pp. 233–42, doi:<a href=\"https://doi.org/10.1111/cgf.12826\">10.1111/cgf.12826</a>.","ista":"Goldade R, Batty C, Wojtan C. 2016. A practical method for high-resolution embedded liquid surfaces. Computer Graphics Forum. 35(2), 233–242.","ama":"Goldade R, Batty C, Wojtan C. A practical method for high-resolution embedded liquid surfaces. <i>Computer Graphics Forum</i>. 2016;35(2):233-242. doi:<a href=\"https://doi.org/10.1111/cgf.12826\">10.1111/cgf.12826</a>","apa":"Goldade, R., Batty, C., &#38; Wojtan, C. (2016). A practical method for high-resolution embedded liquid surfaces. <i>Computer Graphics Forum</i>. Wiley-Blackwell. <a href=\"https://doi.org/10.1111/cgf.12826\">https://doi.org/10.1111/cgf.12826</a>","short":"R. Goldade, C. Batty, C. Wojtan, Computer Graphics Forum 35 (2016) 233–242."},"issue":"2","has_accepted_license":"1","ec_funded":1,"language":[{"iso":"eng"}],"oa_version":"Submitted Version","page":"233 - 242","pubrep_id":"612","author":[{"first_name":"Ryan","full_name":"Goldade, Ryan","last_name":"Goldade"},{"first_name":"Christopher","full_name":"Batty, Christopher","last_name":"Batty"},{"first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546","last_name":"Wojtan","full_name":"Wojtan, Christopher J"}],"department":[{"_id":"ChWo"}],"publication_status":"published","isi":1,"month":"05","volume":35,"scopus_import":"1","intvolume":"        35","ddc":["000"],"acknowledgement":"This research was supported by NSERC (RGPIN-04360-2014) and IST Austria. "},{"citation":{"short":"S. Jeschke, Computer Graphics Forum 35 (2016) 71–79.","apa":"Jeschke, S. (2016). Generalized diffusion curves: An improved vector representation for smooth-shaded images. <i>Computer Graphics Forum</i>. Wiley-Blackwell. <a href=\"https://doi.org/10.1111/cgf.12812\">https://doi.org/10.1111/cgf.12812</a>","ama":"Jeschke S. Generalized diffusion curves: An improved vector representation for smooth-shaded images. <i>Computer Graphics Forum</i>. 2016;35(2):71-79. doi:<a href=\"https://doi.org/10.1111/cgf.12812\">10.1111/cgf.12812</a>","ista":"Jeschke S. 2016. Generalized diffusion curves: An improved vector representation for smooth-shaded images. Computer Graphics Forum. 35(2), 71–79.","mla":"Jeschke, Stefan. “Generalized Diffusion Curves: An Improved Vector Representation for Smooth-Shaded Images.” <i>Computer Graphics Forum</i>, vol. 35, no. 2, Wiley-Blackwell, 2016, pp. 71–79, doi:<a href=\"https://doi.org/10.1111/cgf.12812\">10.1111/cgf.12812</a>.","chicago":"Jeschke, Stefan. “Generalized Diffusion Curves: An Improved Vector Representation for Smooth-Shaded Images.” <i>Computer Graphics Forum</i>. Wiley-Blackwell, 2016. <a href=\"https://doi.org/10.1111/cgf.12812\">https://doi.org/10.1111/cgf.12812</a>.","ieee":"S. Jeschke, “Generalized diffusion curves: An improved vector representation for smooth-shaded images,” <i>Computer Graphics Forum</i>, vol. 35, no. 2. Wiley-Blackwell, pp. 71–79, 2016."},"corr_author":"1","issue":"2","department":[{"_id":"ChWo"}],"author":[{"first_name":"Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87","full_name":"Jeschke, Stefan","last_name":"Jeschke"}],"publication_status":"published","isi":1,"month":"05","volume":35,"scopus_import":"1","intvolume":"        35","language":[{"iso":"eng"}],"oa_version":"None","page":"71 - 79","status":"public","doi":"10.1111/cgf.12812","date_updated":"2025-09-18T14:25:33Z","project":[{"_id":"25357BD2-B435-11E9-9278-68D0E5697425","name":"Deep Pictures: Creating Visual and Haptic Vector Images","grant_number":"P 24352-N23","call_identifier":"FWF"}],"quality_controlled":"1","abstract":[{"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.","lang":"eng"}],"title":"Generalized diffusion curves: An improved vector representation for smooth-shaded images","publisher":"Wiley-Blackwell","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","type":"journal_article","publication":"Computer Graphics Forum","day":"01","article_processing_charge":"No","publist_id":"5794","year":"2016","date_created":"2018-12-11T11:51:53Z","external_id":{"isi":["000377222200008"]},"_id":"1413","date_published":"2016-05-01T00:00:00Z"},{"date_created":"2018-12-11T11:51:53Z","date_published":"2016-05-01T00:00:00Z","external_id":{"isi":["000377222200021"]},"_id":"1415","year":"2016","publist_id":"5793","file_date_updated":"2020-07-14T12:44:53Z","article_processing_charge":"No","day":"01","type":"journal_article","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","publication":"Computer Graphics Forum","publisher":"Wiley-Blackwell","title":"Narrow band FLIP for liquid simulations","quality_controlled":"1","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"}],"file":[{"date_created":"2018-12-12T10:12:22Z","relation":"main_file","file_size":5938324,"access_level":"open_access","creator":"system","file_name":"IST-2016-611-v1+3_CW_nbflip_postprint_2016.pdf","date_updated":"2020-07-14T12:44:53Z","content_type":"application/pdf","checksum":"984afbe510ed48019025dff1dcc7baad","file_id":"4940"}],"doi":"10.1111/cgf.12825","date_updated":"2025-09-18T14:25:04Z","status":"public","oa":1,"pubrep_id":"611","language":[{"iso":"eng"}],"page":"225 - 232","oa_version":"Submitted Version","intvolume":"        35","ddc":["000"],"scopus_import":"1","isi":1,"publication_status":"published","author":[{"first_name":"Florian","full_name":"Ferstl, Florian","last_name":"Ferstl"},{"first_name":"Ryoichi","full_name":"Ando, Ryoichi","last_name":"Ando"},{"full_name":"Wojtan, Christopher J","last_name":"Wojtan","orcid":"0000-0001-6646-5546","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Rüdiger","full_name":"Westermann, Rüdiger","last_name":"Westermann"},{"last_name":"Thuerey","full_name":"Thuerey, Nils","first_name":"Nils"}],"department":[{"_id":"ChWo"}],"volume":35,"month":"05","has_accepted_license":"1","citation":{"apa":"Ferstl, F., Ando, R., Wojtan, C., Westermann, R., &#38; Thuerey, N. (2016). Narrow band FLIP for liquid simulations. <i>Computer Graphics Forum</i>. Wiley-Blackwell. <a href=\"https://doi.org/10.1111/cgf.12825\">https://doi.org/10.1111/cgf.12825</a>","ama":"Ferstl F, Ando R, Wojtan C, Westermann R, Thuerey N. Narrow band FLIP for liquid simulations. <i>Computer Graphics Forum</i>. 2016;35(2):225-232. doi:<a href=\"https://doi.org/10.1111/cgf.12825\">10.1111/cgf.12825</a>","short":"F. Ferstl, R. Ando, C. Wojtan, R. Westermann, N. Thuerey, Computer Graphics Forum 35 (2016) 225–232.","mla":"Ferstl, Florian, et al. “Narrow Band FLIP for Liquid Simulations.” <i>Computer Graphics Forum</i>, vol. 35, no. 2, Wiley-Blackwell, 2016, pp. 225–32, doi:<a href=\"https://doi.org/10.1111/cgf.12825\">10.1111/cgf.12825</a>.","chicago":"Ferstl, Florian, Ryoichi Ando, Chris Wojtan, Rüdiger Westermann, and Nils Thuerey. “Narrow Band FLIP for Liquid Simulations.” <i>Computer Graphics Forum</i>. Wiley-Blackwell, 2016. <a href=\"https://doi.org/10.1111/cgf.12825\">https://doi.org/10.1111/cgf.12825</a>.","ieee":"F. Ferstl, R. Ando, C. Wojtan, R. Westermann, and N. Thuerey, “Narrow band FLIP for liquid simulations,” <i>Computer Graphics Forum</i>, vol. 35, no. 2. Wiley-Blackwell, pp. 225–232, 2016.","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."},"issue":"2"},{"oa":1,"tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"status":"public","doi":"10.15479/AT:ISTA:th_640","date_updated":"2026-07-29T11:25:14Z","publication_identifier":{"issn":["2663-337X"]},"file":[{"date_updated":"2018-12-12T10:13:02Z","file_id":"4982","content_type":"application/pdf","file_size":13869345,"access_level":"open_access","creator":"system","date_created":"2018-12-12T10:13:02Z","relation":"main_file","file_name":"IST-2016-640-v1+1_2016_Bojsen-Hansen_TCaAWSW.pdf"}],"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."}],"title":"Tracking, correcting and absorbing water surface waves","publisher":"Institute of Science and Technology Austria","user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","type":"dissertation","day":"15","article_processing_charge":"No","file_date_updated":"2018-12-12T10:13:02Z","publist_id":"6238","year":"2016","doi_confirm":"1","_id":"1122","date_published":"2016-07-15T00:00:00Z","date_created":"2018-12-11T11:50:16Z","OA_place":"publisher","supervisor":[{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","full_name":"Wojtan, Christopher J","last_name":"Wojtan","orcid":"0000-0001-6646-5546"}],"citation":{"ama":"Bojsen-Hansen M. Tracking, correcting and absorbing water surface waves. 2016. doi:<a href=\"https://doi.org/10.15479/AT:ISTA:th_640\">10.15479/AT:ISTA:th_640</a>","apa":"Bojsen-Hansen, M. (2016). <i>Tracking, correcting and absorbing water surface waves</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/AT:ISTA:th_640\">https://doi.org/10.15479/AT:ISTA:th_640</a>","short":"M. Bojsen-Hansen, Tracking, Correcting and Absorbing Water Surface Waves, Institute of Science and Technology Austria, 2016.","chicago":"Bojsen-Hansen, Morten. “Tracking, Correcting and Absorbing Water Surface Waves.” Institute of Science and Technology Austria, 2016. <a href=\"https://doi.org/10.15479/AT:ISTA:th_640\">https://doi.org/10.15479/AT:ISTA:th_640</a>.","ieee":"M. Bojsen-Hansen, “Tracking, correcting and absorbing water surface waves,” Institute of Science and Technology Austria, 2016.","mla":"Bojsen-Hansen, Morten. <i>Tracking, Correcting and Absorbing Water Surface Waves</i>. Institute of Science and Technology Austria, 2016, doi:<a href=\"https://doi.org/10.15479/AT:ISTA:th_640\">10.15479/AT:ISTA:th_640</a>.","ista":"Bojsen-Hansen M. 2016. Tracking, correcting and absorbing water surface waves. Institute of Science and Technology Austria."},"corr_author":"1","related_material":{"record":[{"status":"public","id":"5558","relation":"other"}]},"degree_awarded":"PhD","alternative_title":["ISTA Thesis"],"has_accepted_license":"1","month":"07","department":[{"_id":"ChWo"},{"_id":"GradSch"}],"author":[{"orcid":"0000-0002-4417-3224","full_name":"Bojsen-Hansen, Morten","last_name":"Bojsen-Hansen","first_name":"Morten","id":"439F0C8C-F248-11E8-B48F-1D18A9856A87"}],"publication_status":"published","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. ","ddc":["004","005","006","532","621"],"oa_version":"Published Version","page":"114","language":[{"iso":"eng"}]},{"ddc":["004"],"article_processing_charge":"No","day":"23","month":"09","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","type":"research_data","department":[{"_id":"ChWo"}],"author":[{"id":"439F0C8C-F248-11E8-B48F-1D18A9856A87","first_name":"Morten","full_name":"Bojsen-Hansen, Morten","last_name":"Bojsen-Hansen","orcid":"0000-0002-4417-3224"}],"date_published":"2016-09-23T00:00:00Z","pubrep_id":"640","_id":"5558","datarep_id":"48","date_created":"2018-12-12T12:31:31Z","file_date_updated":"2020-07-14T12:47:02Z","oa_version":"Published Version","year":"2016","publist_id":"6238","doi":"10.15479/AT:ISTA:48","date_updated":"2026-07-29T11:25:14Z","status":"public","oa":1,"tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"file":[{"file_name":"IST-2016-48-v1+1_2016_Bojsen-Hansen_TCaAWSW.tar.bz2","creator":"system","file_size":55237885,"access_level":"open_access","date_created":"2018-12-12T13:02:18Z","relation":"main_file","content_type":"application/x-bzip2","checksum":"5b1b256ad796fbddb4b7729f5e45e444","file_id":"5589","date_updated":"2020-07-14T12:47:02Z"}],"related_material":{"record":[{"status":"public","id":"1122","relation":"other"}]},"has_accepted_license":"1","publisher":"Institute of Science and Technology Austria","title":"Tracking, Correcting and Absorbing Water Surface Waves","abstract":[{"lang":"eng","text":"PhD thesis LaTeX source code"}],"citation":{"short":"M. Bojsen-Hansen, (2016).","ama":"Bojsen-Hansen M. Tracking, Correcting and Absorbing Water Surface Waves. 2016. doi:<a href=\"https://doi.org/10.15479/AT:ISTA:48\">10.15479/AT:ISTA:48</a>","apa":"Bojsen-Hansen, M. (2016). Tracking, Correcting and Absorbing Water Surface Waves. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/AT:ISTA:48\">https://doi.org/10.15479/AT:ISTA:48</a>","ista":"Bojsen-Hansen M. 2016. Tracking, Correcting and Absorbing Water Surface Waves, Institute of Science and Technology Austria, <a href=\"https://doi.org/10.15479/AT:ISTA:48\">10.15479/AT:ISTA:48</a>.","ieee":"M. Bojsen-Hansen, “Tracking, Correcting and Absorbing Water Surface Waves.” Institute of Science and Technology Austria, 2016.","chicago":"Bojsen-Hansen, Morten. “Tracking, Correcting and Absorbing Water Surface Waves.” Institute of Science and Technology Austria, 2016. <a href=\"https://doi.org/10.15479/AT:ISTA:48\">https://doi.org/10.15479/AT:ISTA:48</a>.","mla":"Bojsen-Hansen, Morten. <i>Tracking, Correcting and Absorbing Water Surface Waves</i>. Institute of Science and Technology Austria, 2016, doi:<a href=\"https://doi.org/10.15479/AT:ISTA:48\">10.15479/AT:ISTA:48</a>."}},{"publication_status":"published","isi":1,"department":[{"_id":"ChWo"}],"author":[{"full_name":"Hahn, David","last_name":"Hahn","id":"357A6A66-F248-11E8-B48F-1D18A9856A87","first_name":"David"},{"full_name":"Wojtan, Christopher J","last_name":"Wojtan","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"conference":{"name":"ACM SIGGRAPH","start_date":"2016-07-24","location":"Anaheim, CA, USA","end_date":"2016-07-28"},"volume":35,"month":"07","ddc":["000"],"intvolume":"        35","scopus_import":"1","language":[{"iso":"eng"}],"oa_version":"Published Version","pubrep_id":"632","article_number":"104","corr_author":"1","citation":{"apa":"Hahn, D., &#38; Wojtan, C. (2016). Fast approximations for boundary element based brittle fracture simulation (Vol. 35). Presented at the ACM SIGGRAPH, Anaheim, CA, USA: ACM. <a href=\"https://doi.org/10.1145/2897824.2925902\">https://doi.org/10.1145/2897824.2925902</a>","ama":"Hahn D, Wojtan C. Fast approximations for boundary element based brittle fracture simulation. In: Vol 35. ACM; 2016. doi:<a href=\"https://doi.org/10.1145/2897824.2925902\">10.1145/2897824.2925902</a>","short":"D. Hahn, C. Wojtan, in:, ACM, 2016.","mla":"Hahn, David, and Chris Wojtan. <i>Fast Approximations for Boundary Element Based Brittle Fracture Simulation</i>. Vol. 35, no. 4, 104, ACM, 2016, doi:<a href=\"https://doi.org/10.1145/2897824.2925902\">10.1145/2897824.2925902</a>.","chicago":"Hahn, David, and Chris Wojtan. “Fast Approximations for Boundary Element Based Brittle Fracture Simulation,” Vol. 35. ACM, 2016. <a href=\"https://doi.org/10.1145/2897824.2925902\">https://doi.org/10.1145/2897824.2925902</a>.","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.","ista":"Hahn D, Wojtan C. 2016. Fast approximations for boundary element based brittle fracture simulation. ACM SIGGRAPH, ACM Transactions on Graphics, vol. 35, 104."},"issue":"4","has_accepted_license":"1","alternative_title":["ACM Transactions on Graphics"],"ec_funded":1,"related_material":{"record":[{"id":"839","status":"public","relation":"dissertation_contains"}]},"type":"conference","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","article_processing_charge":"No","day":"01","year":"2016","publist_id":"5880","file_date_updated":"2020-07-14T12:44:46Z","date_created":"2018-12-11T11:51:35Z","date_published":"2016-07-01T00:00:00Z","_id":"1362","external_id":{"isi":["000380112400074"]},"tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"oa":1,"project":[{"name":"Big Splash: Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"doi":"10.1145/2897824.2925902","date_updated":"2026-07-29T13:27:24Z","status":"public","publisher":"ACM","quality_controlled":"1","title":"Fast approximations for boundary element based brittle fracture simulation","abstract":[{"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.","lang":"eng"}],"file":[{"date_updated":"2020-07-14T12:44:46Z","file_id":"5121","checksum":"943712d9c9dc8bb5048d4adc561d7d38","content_type":"application/pdf","file_size":12453704,"creator":"system","access_level":"open_access","date_created":"2018-12-12T10:15:04Z","relation":"main_file","file_name":"IST-2016-632-v1+2_a104-hahn.pdf"}]},{"file":[{"file_name":"IST-2016-576-v1+1_guerrero-2015-lsp-paper.pdf","relation":"main_file","date_created":"2018-12-12T10:07:49Z","file_size":11902290,"access_level":"open_access","creator":"system","content_type":"application/pdf","checksum":"8b05a51e372c9b0b5af9a00098a9538b","file_id":"4647","date_updated":"2020-07-14T12:45:07Z"}],"quality_controlled":"1","title":"Learning shape placements by example","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."}],"publisher":"ACM","oa":1,"doi":"10.1145/2766933","date_updated":"2025-09-23T09:26:17Z","status":"public","project":[{"_id":"25357BD2-B435-11E9-9278-68D0E5697425","name":"Deep Pictures: Creating Visual and Haptic Vector Images","grant_number":"P 24352-N23","call_identifier":"FWF"}],"file_date_updated":"2020-07-14T12:45:07Z","publist_id":"5525","year":"2015","external_id":{"isi":["000358786600074"]},"_id":"1630","date_published":"2015-07-27T00:00:00Z","date_created":"2018-12-11T11:53:08Z","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","type":"conference","day":"27","article_processing_charge":"No","issue":"4","citation":{"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.","chicago":"Guerrero, Paul, Stefan Jeschke, Michael Wimmer, and Peter Wonka. “Learning Shape Placements by Example,” Vol. 34. ACM, 2015. <a href=\"https://doi.org/10.1145/2766933\">https://doi.org/10.1145/2766933</a>.","mla":"Guerrero, Paul, et al. <i>Learning Shape Placements by Example</i>. Vol. 34, no. 4, 108, ACM, 2015, doi:<a href=\"https://doi.org/10.1145/2766933\">10.1145/2766933</a>.","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.","ama":"Guerrero P, Jeschke S, Wimmer M, Wonka P. Learning shape placements by example. In: Vol 34. ACM; 2015. doi:<a href=\"https://doi.org/10.1145/2766933\">10.1145/2766933</a>","apa":"Guerrero, P., Jeschke, S., Wimmer, M., &#38; 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. <a href=\"https://doi.org/10.1145/2766933\">https://doi.org/10.1145/2766933</a>","short":"P. Guerrero, S. Jeschke, M. Wimmer, P. Wonka, in:, ACM, 2015."},"article_number":"108","has_accepted_license":"1","oa_version":"Submitted Version","language":[{"iso":"eng"}],"pubrep_id":"576","month":"07","volume":34,"conference":{"location":"Los Angeles, CA, United States","start_date":"2015-08-09","end_date":"2015-08-13","name":"SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques"},"department":[{"_id":"ChWo"}],"author":[{"full_name":"Guerrero, Paul","last_name":"Guerrero","first_name":"Paul"},{"full_name":"Jeschke, Stefan","last_name":"Jeschke","first_name":"Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Wimmer","full_name":"Wimmer, Michael","first_name":"Michael"},{"first_name":"Peter","last_name":"Wonka","full_name":"Wonka, Peter"}],"publication_status":"published","isi":1,"acknowledgement":"This publication is based upon work supported by the KAUST Office of Competitive Research Funds (OCRF) under Award No. 62140401, the KAUST Visual Computing Center and the Austrian Science Fund (FWF) projects DEEP PICTURES (no. P24352-N23) and Data-Driven Procedural Modeling of Interiors (no. P24600-N23).","scopus_import":"1","intvolume":"        34","ddc":["000"]},{"language":[{"iso":"eng"}],"oa_version":"Submitted Version","pubrep_id":"610","publication_status":"published","isi":1,"author":[{"first_name":"Ryoichi","full_name":"Ando, Ryoichi","last_name":"Ando"},{"full_name":"Thuerey, Nils","last_name":"Thuerey","first_name":"Nils"},{"last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"conference":{"name":"SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques","end_date":"2015-08-13","start_date":"2015-08-09","location":"Los Angeles, CA, USA"},"department":[{"_id":"ChWo"}],"volume":34,"month":"07","intvolume":"        34","ddc":["000"],"scopus_import":"1","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.","article_number":"53","citation":{"short":"R. Ando, N. Thuerey, C. Wojtan, in:, ACM, 2015.","apa":"Ando, R., Thuerey, N., &#38; 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. <a href=\"https://doi.org/10.1145/2766935\">https://doi.org/10.1145/2766935</a>","ama":"Ando R, Thuerey N, Wojtan C. A stream function solver for liquid simulations. In: Vol 34. ACM; 2015. doi:<a href=\"https://doi.org/10.1145/2766935\">10.1145/2766935</a>","ista":"Ando R, Thuerey N, Wojtan C. 2015. A stream function solver for liquid simulations. SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, ACM Transactions on Graphics, vol. 34, 53.","mla":"Ando, Ryoichi, et al. <i>A Stream Function Solver for Liquid Simulations</i>. Vol. 34, no. 4, 53, ACM, 2015, doi:<a href=\"https://doi.org/10.1145/2766935\">10.1145/2766935</a>.","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. <a href=\"https://doi.org/10.1145/2766935\">https://doi.org/10.1145/2766935</a>."},"issue":"4","has_accepted_license":"1","alternative_title":["ACM Transactions on Graphics"],"year":"2015","publist_id":"5523","file_date_updated":"2020-07-14T12:45:07Z","date_created":"2018-12-11T11:53:09Z","date_published":"2015-07-27T00:00:00Z","external_id":{"isi":["000358786600019"]},"_id":"1632","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","type":"conference","article_processing_charge":"No","day":"27","publisher":"ACM","abstract":[{"text":"This paper presents a liquid simulation technique that enforces the incompressibility condition using a stream function solve instead of a pressure projection. Previous methods have used stream function techniques for the simulation of detailed single-phase flows, but a formulation for liquid simulation has proved elusive in part due to the free surface boundary conditions. In this paper, we introduce a stream function approach to liquid simulations with novel boundary conditions for free surfaces, solid obstacles, and solid-fluid coupling.\r\n\r\nAlthough our approach increases the dimension of the linear system necessary to enforce incompressibility, it provides interesting and surprising benefits. First, the resulting flow is guaranteed to be divergence-free regardless of the accuracy of the solve. Second, our free-surface boundary conditions guarantee divergence-free motion even in the un-simulated air phase, which enables two-phase flow simulation by only computing a single phase. We implemented this method using a variant of FLIP simulation which only samples particles within a narrow band of the liquid surface, and we illustrate the effectiveness of our method for detailed two-phase flow simulations with complex boundaries, detailed bubble interactions, and two-way solid-fluid coupling.","lang":"eng"}],"title":"A stream function solver for liquid simulations","quality_controlled":"1","file":[{"file_name":"IST-2016-610-v1+1_vecpotential.pdf","date_created":"2018-12-12T10:11:52Z","relation":"main_file","file_size":21831121,"creator":"system","access_level":"open_access","file_id":"4909","checksum":"7a9afdfaba9209157ce19376e15bc90b","content_type":"application/pdf","date_updated":"2020-07-14T12:45:07Z"}],"oa":1,"status":"public","doi":"10.1145/2766935","date_updated":"2025-09-23T07:27:29Z"},{"oa":1,"project":[{"call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","name":"Big Splash: Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176"}],"doi":"10.1145/2767003","status":"public","date_updated":"2025-09-23T08:28:56Z","publisher":"ACM","title":"Double bubbles sans toil and trouble: discrete circulation-preserving vortex sheets for soap films and foams","quality_controlled":"1","abstract":[{"lang":"eng","text":"Simulating the delightful dynamics of soap films, bubbles, and foams has traditionally required the use of a fully three-dimensional many-phase Navier-Stokes solver, even though their visual appearance is completely dominated by the thin liquid surface. We depart from earlier work on soap bubbles and foams by noting that their dynamics are naturally described by a Lagrangian vortex sheet model in which circulation is the primary variable. This leads us to derive a novel circulation-preserving surface-only discretization of foam dynamics driven by surface tension on a non-manifold triangle mesh. We represent the surface using a mesh-based multimaterial surface tracker which supports complex bubble topology changes, and evolve the surface according to the ambient air flow induced by a scalar circulation field stored on the mesh. Surface tension forces give rise to a simple update rule for circulation, even at non-manifold Plateau borders, based on a discrete measure of signed scalar mean curvature. We further incorporate vertex constraints to enable the interaction of soap films with wires. The result is a method that is at once simple, robust, and efficient, yet able to capture an array of soap films behaviors including foam rearrangement, catenoid collapse, blowing bubbles, and double bubbles being pulled apart."}],"file":[{"relation":"main_file","date_created":"2018-12-12T10:11:14Z","file_size":8973215,"creator":"system","access_level":"open_access","file_name":"IST-2016-608-v1+1_doublebubbles.pdf","date_updated":"2020-07-14T12:45:07Z","file_id":"4867","checksum":"57b07d78d2d612a8052744b37d4a71fa","content_type":"application/pdf"}],"user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","type":"conference","article_processing_charge":"No","day":"27","year":"2015","publist_id":"5521","file_date_updated":"2020-07-14T12:45:07Z","date_created":"2018-12-11T11:53:09Z","date_published":"2015-07-27T00:00:00Z","_id":"1634","external_id":{"isi":["000358786600115"]},"article_number":"149","citation":{"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. <a href=\"https://doi.org/10.1145/2767003\">https://doi.org/10.1145/2767003</a>.","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. <i>Double Bubbles sans Toil and Trouble: Discrete Circulation-Preserving Vortex Sheets for Soap Films and Foams</i>. Vol. 34, no. 4, 149, ACM, 2015, doi:<a href=\"https://doi.org/10.1145/2767003\">10.1145/2767003</a>.","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.","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:<a href=\"https://doi.org/10.1145/2767003\">10.1145/2767003</a>","apa":"Da, F., Batty, C., Wojtan, C., &#38; 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. <a href=\"https://doi.org/10.1145/2767003\">https://doi.org/10.1145/2767003</a>","short":"F. Da, C. Batty, C. Wojtan, E. Grinspun, in:, ACM, 2015."},"issue":"4","has_accepted_license":"1","ec_funded":1,"publication_status":"published","isi":1,"department":[{"_id":"ChWo"}],"author":[{"first_name":"Fang","last_name":"Da","full_name":"Da, Fang"},{"first_name":"Christopher","full_name":"Batty, Christopher","last_name":"Batty"},{"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"}],"conference":{"name":"SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques","end_date":"2015-08-13","location":"Los Angeles, CA, United States","start_date":"2015-08-09"},"month":"07","volume":34,"ddc":["000"],"intvolume":"        34","scopus_import":"1","language":[{"iso":"eng"}],"oa_version":"Submitted Version","pubrep_id":"608"},{"oa":1,"status":"public","doi":"10.1111/cgf.12576","date_updated":"2025-09-22T14:29:19Z","publisher":"Wiley","title":"A dimension-reduced pressure solver for liquid simulations","quality_controlled":"1","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."}],"file":[{"content_type":"application/pdf","file_id":"5218","checksum":"590752bf977855b337a80f78a9bc2404","date_updated":"2020-07-14T12:45:15Z","file_name":"IST-2016-607-v1+1_coarsegrid.pdf","relation":"main_file","date_created":"2018-12-12T10:16:30Z","access_level":"open_access","creator":"system","file_size":6312352}],"user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","type":"journal_article","publication":"Computer Graphics Forum","article_processing_charge":"No","day":"01","year":"2015","publist_id":"5389","file_date_updated":"2020-07-14T12:45:15Z","date_created":"2018-12-11T11:53:44Z","date_published":"2015-05-01T00:00:00Z","external_id":{"isi":["000358326600045"]},"_id":"1735","citation":{"short":"R. Ando, N. Thürey, C. Wojtan, Computer Graphics Forum 34 (2015) 473–480.","ama":"Ando R, Thürey N, Wojtan C. A dimension-reduced pressure solver for liquid simulations. <i>Computer Graphics Forum</i>. 2015;34(2):473-480. doi:<a href=\"https://doi.org/10.1111/cgf.12576\">10.1111/cgf.12576</a>","apa":"Ando, R., Thürey, N., &#38; Wojtan, C. (2015). A dimension-reduced pressure solver for liquid simulations. <i>Computer Graphics Forum</i>. Wiley. <a href=\"https://doi.org/10.1111/cgf.12576\">https://doi.org/10.1111/cgf.12576</a>","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.” <i>Computer Graphics Forum</i>. Wiley, 2015. <a href=\"https://doi.org/10.1111/cgf.12576\">https://doi.org/10.1111/cgf.12576</a>.","ieee":"R. Ando, N. Thürey, and C. Wojtan, “A dimension-reduced pressure solver for liquid simulations,” <i>Computer Graphics Forum</i>, vol. 34, no. 2. Wiley, pp. 473–480, 2015.","mla":"Ando, Ryoichi, et al. “A Dimension-Reduced Pressure Solver for Liquid Simulations.” <i>Computer Graphics Forum</i>, vol. 34, no. 2, Wiley, 2015, pp. 473–80, doi:<a href=\"https://doi.org/10.1111/cgf.12576\">10.1111/cgf.12576</a>."},"issue":"2","has_accepted_license":"1","isi":1,"publication_status":"published","author":[{"first_name":"Ryoichi","last_name":"Ando","full_name":"Ando, Ryoichi"},{"last_name":"Thürey","full_name":"Thürey, Nils","first_name":"Nils"},{"orcid":"0000-0001-6646-5546","last_name":"Wojtan","full_name":"Wojtan, Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J"}],"department":[{"_id":"ChWo"}],"month":"05","volume":34,"intvolume":"        34","ddc":["000"],"scopus_import":"1","acknowledgement":"The first author was supported by a JSPS Postdoctoral Fellowship for Research Abroad","language":[{"iso":"eng"}],"page":"473 - 480","oa_version":"Submitted Version","pubrep_id":"607"},{"file_date_updated":"2020-07-14T12:45:17Z","publist_id":"5292","year":"2015","external_id":{"isi":["000354800700004"]},"_id":"1814","date_published":"2015-04-01T00:00:00Z","date_created":"2018-12-11T11:54:09Z","publication":"ACM Transactions on Graphics","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","type":"journal_article","day":"01","article_processing_charge":"No","file":[{"file_id":"4933","checksum":"67c9f4fa370def68cdf31299e48bc91f","content_type":"application/pdf","date_updated":"2020-07-14T12:45:17Z","file_name":"IST-2016-575-v1+1_wavefront_preprint.pdf","date_created":"2018-12-12T10:12:15Z","relation":"main_file","creator":"system","file_size":23712153,"access_level":"open_access"}],"quality_controlled":"1","title":"Water wave animation via wavefront parameter interpolation","abstract":[{"text":"We present an efficient wavefront tracking algorithm for animating bodies of water that interact with their environment. Our contributions include: a novel wavefront tracking technique that enables dispersion, refraction, reflection, and diffraction in the same simulation; a unique multivalued function interpolation method that enables our simulations to elegantly sidestep the Nyquist limit; a dispersion approximation for efficiently amplifying the number of simulated waves by several orders of magnitude; and additional extensions that allow for time-dependent effects and interactive artistic editing of the resulting animation. Our contributions combine to give us multitudes more wave details than similar algorithms, while maintaining high frame rates and allowing close camera zooms.","lang":"eng"}],"publisher":"ACM","oa":1,"status":"public","doi":"10.1145/2714572","date_updated":"2025-09-29T11:05:55Z","project":[{"_id":"25357BD2-B435-11E9-9278-68D0E5697425","name":"Deep Pictures: Creating Visual and Haptic Vector Images","grant_number":"P 24352-N23","call_identifier":"FWF"},{"_id":"2533E772-B435-11E9-9278-68D0E5697425","grant_number":"638176","name":"Big Splash: Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020"}],"oa_version":"Submitted Version","language":[{"iso":"eng"}],"pubrep_id":"575","month":"04","volume":34,"department":[{"_id":"ChWo"}],"author":[{"first_name":"Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87","full_name":"Jeschke, Stefan","last_name":"Jeschke"},{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","full_name":"Wojtan, Christopher J","last_name":"Wojtan","orcid":"0000-0001-6646-5546"}],"publication_status":"published","isi":1,"scopus_import":"1","ddc":["000"],"intvolume":"        34","issue":"3","citation":{"apa":"Jeschke, S., &#38; Wojtan, C. (2015). Water wave animation via wavefront parameter interpolation. <i>ACM Transactions on Graphics</i>. ACM. <a href=\"https://doi.org/10.1145/2714572\">https://doi.org/10.1145/2714572</a>","ama":"Jeschke S, Wojtan C. Water wave animation via wavefront parameter interpolation. <i>ACM Transactions on Graphics</i>. 2015;34(3). doi:<a href=\"https://doi.org/10.1145/2714572\">10.1145/2714572</a>","short":"S. Jeschke, C. Wojtan, ACM Transactions on Graphics 34 (2015).","mla":"Jeschke, Stefan, and Chris Wojtan. “Water Wave Animation via Wavefront Parameter Interpolation.” <i>ACM Transactions on Graphics</i>, vol. 34, no. 3, 27, ACM, 2015, doi:<a href=\"https://doi.org/10.1145/2714572\">10.1145/2714572</a>.","ieee":"S. Jeschke and C. Wojtan, “Water wave animation via wavefront parameter interpolation,” <i>ACM Transactions on Graphics</i>, vol. 34, no. 3. ACM, 2015.","chicago":"Jeschke, Stefan, and Chris Wojtan. “Water Wave Animation via Wavefront Parameter Interpolation.” <i>ACM Transactions on Graphics</i>. ACM, 2015. <a href=\"https://doi.org/10.1145/2714572\">https://doi.org/10.1145/2714572</a>.","ista":"Jeschke S, Wojtan C. 2015. Water wave animation via wavefront parameter interpolation. ACM Transactions on Graphics. 34(3), 27."},"corr_author":"1","article_number":"27","ec_funded":1,"has_accepted_license":"1"},{"pubrep_id":"609","language":[{"iso":"eng"}],"oa_version":"Submitted Version","scopus_import":"1","intvolume":"        34","ddc":["000"],"author":[{"last_name":"Hahn","full_name":"Hahn, David","id":"357A6A66-F248-11E8-B48F-1D18A9856A87","first_name":"David"},{"first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","last_name":"Wojtan","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546"}],"conference":{"name":"SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques","start_date":"2015-08-09","location":"Los Angeles, CA, United States","end_date":"2015-08-13"},"department":[{"_id":"ChWo"}],"isi":1,"publication_status":"published","month":"07","volume":34,"has_accepted_license":"1","related_material":{"record":[{"id":"839","status":"public","relation":"dissertation_contains"}]},"ec_funded":1,"citation":{"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.","chicago":"Hahn, David, and Chris Wojtan. “High-Resolution Brittle Fracture Simulation with Boundary Elements,” Vol. 34. ACM, 2015. <a href=\"https://doi.org/10.1145/2766896\">https://doi.org/10.1145/2766896</a>.","mla":"Hahn, David, and Chris Wojtan. <i>High-Resolution Brittle Fracture Simulation with Boundary Elements</i>. Vol. 34, no. 4, 151, ACM, 2015, doi:<a href=\"https://doi.org/10.1145/2766896\">10.1145/2766896</a>.","ista":"Hahn D, Wojtan C. 2015. High-resolution brittle fracture simulation with boundary elements. SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques vol. 34, 151.","ama":"Hahn D, Wojtan C. High-resolution brittle fracture simulation with boundary elements. In: Vol 34. ACM; 2015. doi:<a href=\"https://doi.org/10.1145/2766896\">10.1145/2766896</a>","apa":"Hahn, D., &#38; 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. <a href=\"https://doi.org/10.1145/2766896\">https://doi.org/10.1145/2766896</a>","short":"D. Hahn, C. Wojtan, in:, ACM, 2015."},"article_number":"151","corr_author":"1","issue":"4","date_created":"2018-12-11T11:53:09Z","_id":"1633","external_id":{"isi":["000358786600117"]},"date_published":"2015-07-27T00:00:00Z","publist_id":"5522","year":"2015","file_date_updated":"2020-07-14T12:45:07Z","day":"27","article_processing_charge":"No","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","type":"conference","title":"High-resolution brittle fracture simulation with boundary elements","abstract":[{"lang":"eng","text":"We present a method for simulating brittle fracture under the assumptions of quasi-static linear elastic fracture mechanics (LEFM). Using the boundary element method (BEM) and Lagrangian crack-fronts, we produce highly detailed fracture surfaces. The computational cost of the BEM is alleviated by using a low-resolution mesh and interpolating the resulting stress intensity factors when propagating the high-resolution crack-front.\r\n\r\nOur system produces physics-based fracture surfaces with high spatial and temporal resolution, taking spatial variation of material toughness and/or strength into account. It also allows for crack initiation to be handled separately from crack propagation, which is not only more reasonable from a physics perspective, but can also be used to control the simulation.\r\n\r\nSeparating the resolution of the crack-front from the resolution of the computational mesh increases the efficiency and therefore the amount of visual detail on the resulting fracture surfaces. The BEM also allows us to re-use previously computed blocks of the system matrix."}],"quality_controlled":"1","publisher":"ACM","file":[{"date_updated":"2020-07-14T12:45:07Z","file_id":"5131","content_type":"application/pdf","checksum":"955aee971983f6b6152bcc1c9b4a7c20","creator":"system","access_level":"open_access","file_size":20154270,"relation":"main_file","date_created":"2018-12-12T10:15:13Z","file_name":"IST-2016-609-v1+1_FractureBEM.pdf"}],"status":"public","doi":"10.1145/2766896","date_updated":"2026-07-29T13:27:24Z","project":[{"name":"Big Splash: Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"oa":1},{"file":[{"access_level":"open_access","file_size":9832561,"creator":"system","relation":"main_file","date_created":"2018-12-12T10:11:22Z","file_name":"IST-2016-577-v1+1_2014.TOG.Paul.EditingPropagation.final.pdf","date_updated":"2020-07-14T12:45:07Z","checksum":"7f91e588a4e888610313b98271e6418e","content_type":"application/pdf","file_id":"4876"}],"title":"Edit propagation using geometric relationship functions","quality_controlled":"1","abstract":[{"text":"We propose a method for propagating edit operations in 2D vector graphics, based on geometric relationship functions. These functions quantify the geometric relationship of a point to a polygon, such as the distance to the boundary or the direction to the closest corner vertex. The level sets of the relationship functions describe points with the same relationship to a polygon. For a given query point, we first determine a set of relationships to local features, construct all level sets for these relationships, and accumulate them. The maxima of the resulting distribution are points with similar geometric relationships. We show extensions to handle mirror symmetries, and discuss the use of relationship functions as local coordinate systems. Our method can be applied, for example, to interactive floorplan editing, and it is especially useful for large layouts, where individual edits would be cumbersome. We demonstrate populating 2D layouts with tens to hundreds of objects by propagating relatively few edit operations.","lang":"eng"}],"publisher":"ACM","oa":1,"status":"public","doi":"10.1145/2591010","date_updated":"2025-09-29T13:16:25Z","file_date_updated":"2020-07-14T12:45:07Z","publist_id":"5526","year":"2014","_id":"1629","external_id":{"isi":["000335009900003"]},"date_published":"2014-03-01T00:00:00Z","date_created":"2018-12-11T11:53:08Z","publication":"ACM Transactions on Graphics","type":"journal_article","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","day":"01","article_processing_charge":"No","issue":"2","citation":{"short":"P. Guerrero, S. Jeschke, M. Wimmer, P. Wonka, ACM Transactions on Graphics 33 (2014).","ama":"Guerrero P, Jeschke S, Wimmer M, Wonka P. Edit propagation using geometric relationship functions. <i>ACM Transactions on Graphics</i>. 2014;33(2). doi:<a href=\"https://doi.org/10.1145/2591010\">10.1145/2591010</a>","apa":"Guerrero, P., Jeschke, S., Wimmer, M., &#38; Wonka, P. (2014). Edit propagation using geometric relationship functions. <i>ACM Transactions on Graphics</i>. ACM. <a href=\"https://doi.org/10.1145/2591010\">https://doi.org/10.1145/2591010</a>","ista":"Guerrero P, Jeschke S, Wimmer M, Wonka P. 2014. Edit propagation using geometric relationship functions. ACM Transactions on Graphics. 33(2), 15.","ieee":"P. Guerrero, S. Jeschke, M. Wimmer, and P. Wonka, “Edit propagation using geometric relationship functions,” <i>ACM Transactions on Graphics</i>, vol. 33, no. 2. ACM, 2014.","chicago":"Guerrero, Paul, Stefan Jeschke, Michael Wimmer, and Peter Wonka. “Edit Propagation Using Geometric Relationship Functions.” <i>ACM Transactions on Graphics</i>. ACM, 2014. <a href=\"https://doi.org/10.1145/2591010\">https://doi.org/10.1145/2591010</a>.","mla":"Guerrero, Paul, et al. “Edit Propagation Using Geometric Relationship Functions.” <i>ACM Transactions on Graphics</i>, vol. 33, no. 2, 15, ACM, 2014, doi:<a href=\"https://doi.org/10.1145/2591010\">10.1145/2591010</a>."},"article_number":"15","has_accepted_license":"1","oa_version":"Submitted Version","language":[{"iso":"eng"}],"pubrep_id":"577","month":"03","volume":33,"author":[{"first_name":"Paul","last_name":"Guerrero","full_name":"Guerrero, Paul"},{"last_name":"Jeschke","full_name":"Jeschke, Stefan","first_name":"Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Wimmer, Michael","last_name":"Wimmer","first_name":"Michael"},{"last_name":"Wonka","full_name":"Wonka, Peter","first_name":"Peter"}],"department":[{"_id":"ChWo"}],"isi":1,"publication_status":"published","ddc":["000"],"intvolume":"        33"},{"publist_id":"5246","year":"2014","file_date_updated":"2020-07-14T12:45:19Z","date_created":"2018-12-11T11:54:22Z","external_id":{"isi":["000350145600019"]},"_id":"1854","date_published":"2014-11-05T00:00:00Z","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","type":"journal_article","publication":"Computer Graphics Forum","day":"05","article_processing_charge":"No","title":"Partial shape matching using transformation parameter similarity","quality_controlled":"1","abstract":[{"text":"In this paper, we present a method for non-rigid, partial shape matching in vector graphics. Given a user-specified query region in a 2D shape, similar regions are found, even if they are non-linearly distorted. Furthermore, a non-linear mapping is established between the query regions and these matches, which allows the automatic transfer of editing operations such as texturing. This is achieved by a two-step approach. First, pointwise correspondences between the query region and the whole shape are established. The transformation parameters of these correspondences are registered in an appropriate transformation space. For transformations between similar regions, these parameters form surfaces in transformation space, which are extracted in the second step of our method. The extracted regions may be related to the query region by a non-rigid transform, enabling non-rigid shape matching. In this paper, we present a method for non-rigid, partial shape matching in vector graphics. Given a user-specified query region in a 2D shape, similar regions are found, even if they are non-linearly distorted. Furthermore, a non-linear mapping is established between the query regions and these matches, which allows the automatic transfer of editing operations such as texturing. This is achieved by a two-step approach. First, pointwise correspondences between the query region and the whole shape are established. The transformation parameters of these correspondences are registered in an appropriate transformation space. For transformations between similar regions, these parameters form surfaces in transformation space, which are extracted in the second step of our method. The extracted regions may be related to the query region by a non-rigid transform, enabling non-rigid shape matching.","lang":"eng"}],"publisher":"Wiley","file":[{"file_name":"IST-2016-574-v1+1_Guerrero-2014-TPS-paper.pdf","file_size":24817484,"creator":"system","access_level":"open_access","date_created":"2018-12-12T10:15:58Z","relation":"main_file","checksum":"91946bfc509c77f5fd3151a3ff2b2c8f","content_type":"application/pdf","file_id":"5182","date_updated":"2020-07-14T12:45:19Z"}],"oa":1,"doi":"10.1111/cgf.12509","date_updated":"2025-09-23T09:47:49Z","status":"public","language":[{"iso":"eng"}],"oa_version":"Submitted Version","page":"239 - 252","pubrep_id":"574","department":[{"_id":"ChWo"}],"author":[{"first_name":"Paul","last_name":"Guerrero","full_name":"Guerrero, Paul"},{"orcid":"0000-0002-1546-3265","full_name":"Auzinger, Thomas","last_name":"Auzinger","id":"4718F954-F248-11E8-B48F-1D18A9856A87","first_name":"Thomas"},{"first_name":"Michael","last_name":"Wimmer","full_name":"Wimmer, Michael"},{"first_name":"Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87","last_name":"Jeschke","full_name":"Jeschke, Stefan"}],"isi":1,"publication_status":"published","volume":34,"month":"11","scopus_import":"1","intvolume":"        34","ddc":["000"],"citation":{"short":"P. Guerrero, T. Auzinger, M. Wimmer, S. Jeschke, Computer Graphics Forum 34 (2014) 239–252.","ama":"Guerrero P, Auzinger T, Wimmer M, Jeschke S. Partial shape matching using transformation parameter similarity. <i>Computer Graphics Forum</i>. 2014;34(1):239-252. doi:<a href=\"https://doi.org/10.1111/cgf.12509\">10.1111/cgf.12509</a>","apa":"Guerrero, P., Auzinger, T., Wimmer, M., &#38; Jeschke, S. (2014). Partial shape matching using transformation parameter similarity. <i>Computer Graphics Forum</i>. Wiley. <a href=\"https://doi.org/10.1111/cgf.12509\">https://doi.org/10.1111/cgf.12509</a>","ista":"Guerrero P, Auzinger T, Wimmer M, Jeschke S. 2014. Partial shape matching using transformation parameter similarity. Computer Graphics Forum. 34(1), 239–252.","ieee":"P. Guerrero, T. Auzinger, M. Wimmer, and S. Jeschke, “Partial shape matching using transformation parameter similarity,” <i>Computer Graphics Forum</i>, vol. 34, no. 1. Wiley, pp. 239–252, 2014.","chicago":"Guerrero, Paul, Thomas Auzinger, Michael Wimmer, and Stefan Jeschke. “Partial Shape Matching Using Transformation Parameter Similarity.” <i>Computer Graphics Forum</i>. Wiley, 2014. <a href=\"https://doi.org/10.1111/cgf.12509\">https://doi.org/10.1111/cgf.12509</a>.","mla":"Guerrero, Paul, et al. “Partial Shape Matching Using Transformation Parameter Similarity.” <i>Computer Graphics Forum</i>, vol. 34, no. 1, Wiley, 2014, pp. 239–52, doi:<a href=\"https://doi.org/10.1111/cgf.12509\">10.1111/cgf.12509</a>."},"issue":"1","has_accepted_license":"1"},{"citation":{"ieee":"M. Arikan, R. Preiner, C. Scheiblauer, S. Jeschke, and M. Wimmer, “Large-scale point-cloud visualization through localized textured surface reconstruction,” <i>IEEE Transactions on Visualization and Computer Graphics</i>, vol. 20, no. 9. IEEE, pp. 1280–1292, 2014.","chicago":"Arikan, Murat, Reinhold Preiner, Claus Scheiblauer, Stefan Jeschke, and Michael Wimmer. “Large-Scale Point-Cloud Visualization through Localized Textured Surface Reconstruction.” <i>IEEE Transactions on Visualization and Computer Graphics</i>. IEEE, 2014. <a href=\"https://doi.org/10.1109/TVCG.2014.2312011\">https://doi.org/10.1109/TVCG.2014.2312011</a>.","mla":"Arikan, Murat, et al. “Large-Scale Point-Cloud Visualization through Localized Textured Surface Reconstruction.” <i>IEEE Transactions on Visualization and Computer Graphics</i>, vol. 20, no. 9, IEEE, 2014, pp. 1280–92, doi:<a href=\"https://doi.org/10.1109/TVCG.2014.2312011\">10.1109/TVCG.2014.2312011</a>.","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.","ama":"Arikan M, Preiner R, Scheiblauer C, Jeschke S, Wimmer M. Large-scale point-cloud visualization through localized textured surface reconstruction. <i>IEEE Transactions on Visualization and Computer Graphics</i>. 2014;20(9):1280-1292. doi:<a href=\"https://doi.org/10.1109/TVCG.2014.2312011\">10.1109/TVCG.2014.2312011</a>","apa":"Arikan, M., Preiner, R., Scheiblauer, C., Jeschke, S., &#38; Wimmer, M. (2014). Large-scale point-cloud visualization through localized textured surface reconstruction. <i>IEEE Transactions on Visualization and Computer Graphics</i>. IEEE. <a href=\"https://doi.org/10.1109/TVCG.2014.2312011\">https://doi.org/10.1109/TVCG.2014.2312011</a>","short":"M. Arikan, R. Preiner, C. Scheiblauer, S. Jeschke, M. Wimmer, IEEE Transactions on Visualization and Computer Graphics 20 (2014) 1280–1292."},"issue":"9","has_accepted_license":"1","language":[{"iso":"eng"}],"oa_version":"Submitted Version","page":"1280 - 1292","pubrep_id":"573","author":[{"full_name":"Arikan, Murat","last_name":"Arikan","first_name":"Murat"},{"first_name":"Reinhold","full_name":"Preiner, Reinhold","last_name":"Preiner"},{"last_name":"Scheiblauer","full_name":"Scheiblauer, Claus","first_name":"Claus"},{"first_name":"Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87","last_name":"Jeschke","full_name":"Jeschke, Stefan"},{"first_name":"Michael","last_name":"Wimmer","full_name":"Wimmer, Michael"}],"department":[{"_id":"ChWo"}],"isi":1,"publication_status":"published","month":"09","volume":20,"scopus_import":"1","ddc":["000"],"intvolume":"        20","acknowledgement":"This research was supported by the Austrian Research Promotion Agency (FFG) project REPLICATE (no. 835948), the EU FP7 project HARVEST4D (no. 323567).","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."}],"title":"Large-scale point-cloud visualization through localized textured surface reconstruction","publisher":"IEEE","file":[{"file_name":"IST-2016-573-v1+1_arikan-2014-pcvis-draft.pdf","file_size":13594598,"creator":"system","access_level":"open_access","date_created":"2018-12-12T10:17:41Z","relation":"main_file","file_id":"5297","checksum":"5bf58942d2eb20adf03c7f9ea2e68124","content_type":"application/pdf","date_updated":"2020-07-14T12:45:20Z"}],"oa":1,"date_updated":"2025-09-29T12:27:48Z","status":"public","doi":"10.1109/TVCG.2014.2312011","project":[{"_id":"25357BD2-B435-11E9-9278-68D0E5697425","grant_number":"P 24352-N23","name":"Deep Pictures: Creating Visual and Haptic Vector Images","call_identifier":"FWF"}],"publist_id":"5189","year":"2014","file_date_updated":"2020-07-14T12:45:20Z","date_created":"2018-12-11T11:54:39Z","_id":"1906","external_id":{"isi":["000341566500006"]},"date_published":"2014-09-09T00:00:00Z","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","type":"journal_article","publication":"IEEE Transactions on Visualization and Computer Graphics","day":"09","article_processing_charge":"No"},{"oa":1,"doi":"10.1145/2601097.2601126","status":"public","date_updated":"2025-09-29T11:49:44Z","project":[{"_id":"25636330-B435-11E9-9278-68D0E5697425","name":"Genome-wide Analysis of Root Traits","grant_number":"11-NSF-1070"}],"abstract":[{"lang":"eng","text":"We present a method for smoothly blending between existing liquid animations. We introduce a semi-automatic method for matching two existing liquid animations, which we use to create new fluid motion that plausibly interpolates the input. Our contributions include a new space-time non-rigid iterative closest point algorithm that incorporates user guidance, a subsampling technique for efficient registration of meshes with millions of vertices, and a fast surface extraction algorithm that produces 3D triangle meshes from a 4D space-time surface. Our technique can be used to instantly create hundreds of new simulations, or to interactively explore complex parameter spaces. Our method is guaranteed to produce output that does not deviate from the input animations, and it generalizes to multiple dimensions. Because our method runs at interactive rates after the initial precomputation step, it has potential applications in games and training simulations."}],"title":"Blending liquids","quality_controlled":"1","publisher":"ACM","file":[{"access_level":"open_access","creator":"system","file_size":8387384,"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_id":"4688","content_type":"application/pdf","checksum":"1752760a2e71e254537f31c0d10d9c6c"}],"user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","type":"conference","publication":"ACM Transactions on Graphics","day":"01","article_processing_charge":"No","publist_id":"4988","year":"2014","file_date_updated":"2020-07-14T12:45:27Z","date_created":"2018-12-11T11:55:28Z","external_id":{"isi":["000340000100104"]},"_id":"2058","date_published":"2014-07-01T00:00:00Z","citation":{"short":"K. Raveendran, C. Wojtan, N. Thuerey, G. Türk, in:, ACM Transactions on Graphics, ACM, 2014.","apa":"Raveendran, K., Wojtan, C., Thuerey, N., &#38; Türk, G. (2014). Blending liquids. In <i>ACM Transactions on Graphics</i> (Vol. 33). Vancouver, Canada: ACM. <a href=\"https://doi.org/10.1145/2601097.2601126\">https://doi.org/10.1145/2601097.2601126</a>","ama":"Raveendran K, Wojtan C, Thuerey N, Türk G. Blending liquids. In: <i>ACM Transactions on Graphics</i>. Vol 33. ACM; 2014. doi:<a href=\"https://doi.org/10.1145/2601097.2601126\">10.1145/2601097.2601126</a>","ista":"Raveendran K, Wojtan C, Thuerey N, Türk G. 2014. Blending liquids. ACM Transactions on Graphics. SIGGRAPH: International Conference and Exhibition on Computer Graphics and Interactive Techniques vol. 33, 137.","mla":"Raveendran, Karthik, et al. “Blending Liquids.” <i>ACM Transactions on Graphics</i>, vol. 33, no. 4, 137, ACM, 2014, doi:<a href=\"https://doi.org/10.1145/2601097.2601126\">10.1145/2601097.2601126</a>.","ieee":"K. Raveendran, C. Wojtan, N. Thuerey, and G. Türk, “Blending liquids,” in <i>ACM Transactions on Graphics</i>, Vancouver, Canada, 2014, vol. 33, no. 4.","chicago":"Raveendran, Karthik, Chris Wojtan, Nils Thuerey, and Greg Türk. “Blending Liquids.” In <i>ACM Transactions on Graphics</i>, Vol. 33. ACM, 2014. <a href=\"https://doi.org/10.1145/2601097.2601126\">https://doi.org/10.1145/2601097.2601126</a>."},"article_number":"137","issue":"4","has_accepted_license":"1","author":[{"first_name":"Karthik","full_name":"Raveendran, Karthik","last_name":"Raveendran"},{"first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J","last_name":"Wojtan","orcid":"0000-0001-6646-5546"},{"first_name":"Nils","last_name":"Thuerey","full_name":"Thuerey, Nils"},{"first_name":"Greg","last_name":"Türk","full_name":"Türk, Greg"}],"conference":{"start_date":"2014-08-10","location":"Vancouver, Canada","end_date":"2014-08-14","name":"SIGGRAPH: International Conference and Exhibition on Computer Graphics and Interactive Techniques"},"department":[{"_id":"ChWo"}],"publication_status":"published","isi":1,"month":"07","volume":33,"scopus_import":"1","ddc":["000"],"intvolume":"        33","language":[{"iso":"eng"}],"oa_version":"Submitted Version","pubrep_id":"606"},{"issue":"4","citation":{"ista":"Ando R, Thuerey N, Wojtan C. 2013. Highly adaptive liquid simulations on tetrahedral meshes. ACM Transactions on Graphics. 32(4), 103.","mla":"Ando, Ryoichi, et al. “Highly Adaptive Liquid Simulations on Tetrahedral Meshes.” <i>ACM Transactions on Graphics</i>, vol. 32, no. 4, 103, ACM, 2013, doi:<a href=\"https://doi.org/10.1145/2461912.2461982\">10.1145/2461912.2461982</a>.","chicago":"Ando, Ryoichi, Nils Thuerey, and Chris Wojtan. “Highly Adaptive Liquid Simulations on Tetrahedral Meshes.” <i>ACM Transactions on Graphics</i>. ACM, 2013. <a href=\"https://doi.org/10.1145/2461912.2461982\">https://doi.org/10.1145/2461912.2461982</a>.","ieee":"R. Ando, N. Thuerey, and C. Wojtan, “Highly adaptive liquid simulations on tetrahedral meshes,” <i>ACM Transactions on Graphics</i>, vol. 32, no. 4. ACM, 2013.","short":"R. Ando, N. Thuerey, C. Wojtan, ACM Transactions on Graphics 32 (2013).","apa":"Ando, R., Thuerey, N., &#38; Wojtan, C. (2013). Highly adaptive liquid simulations on tetrahedral meshes. <i>ACM Transactions on Graphics</i>. ACM. <a href=\"https://doi.org/10.1145/2461912.2461982\">https://doi.org/10.1145/2461912.2461982</a>","ama":"Ando R, Thuerey N, Wojtan C. Highly adaptive liquid simulations on tetrahedral meshes. <i>ACM Transactions on Graphics</i>. 2013;32(4). doi:<a href=\"https://doi.org/10.1145/2461912.2461982\">10.1145/2461912.2461982</a>"},"article_number":"103","has_accepted_license":"1","oa_version":"Submitted Version","language":[{"iso":"eng"}],"pubrep_id":"605","volume":32,"month":"07","department":[{"_id":"ChWo"}],"author":[{"full_name":"Ando, Ryoichi","last_name":"Ando","first_name":"Ryoichi"},{"first_name":"Nils","full_name":"Thuerey, Nils","last_name":"Thuerey"},{"full_name":"Wojtan, Christopher J","last_name":"Wojtan","orcid":"0000-0001-6646-5546","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"publication_status":"published","isi":1,"scopus_import":"1","intvolume":"        32","ddc":["000"],"file":[{"checksum":"aeea6b0ff2b27c695aeb8408c7d2fc50","file_id":"5279","content_type":"application/pdf","date_updated":"2020-07-14T12:45:41Z","file_name":"IST-2016-605-v1+1_tetflip_fixed.pdf","date_created":"2018-12-12T10:17:25Z","relation":"main_file","access_level":"open_access","file_size":8601561,"creator":"system"}],"title":"Highly adaptive liquid simulations on tetrahedral meshes","quality_controlled":"1","abstract":[{"lang":"eng","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."}],"publisher":"ACM","oa":1,"doi":"10.1145/2461912.2461982","status":"public","date_updated":"2025-09-29T14:13:52Z","file_date_updated":"2020-07-14T12:45:41Z","publist_id":"4436","year":"2013","_id":"2466","external_id":{"isi":["000321840100072"]},"date_published":"2013-07-01T00:00:00Z","date_created":"2018-12-11T11:57:50Z","publication":"ACM Transactions on Graphics","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","type":"journal_article","day":"01","article_processing_charge":"No"},{"oa_version":"Submitted Version","language":[{"iso":"eng"}],"pubrep_id":"604","month":"07","volume":32,"author":[{"full_name":"Bernstein, Gilbert","last_name":"Bernstein","first_name":"Gilbert"},{"orcid":"0000-0001-6646-5546","last_name":"Wojtan","full_name":"Wojtan, Christopher J","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"department":[{"_id":"ChWo"}],"publication_status":"published","isi":1,"scopus_import":"1","intvolume":"        32","ddc":["000"],"issue":"4","citation":{"ieee":"G. Bernstein and C. Wojtan, “Putting holes in holey geometry: Topology change for arbitrary surfaces,” <i>ACM Transactions on Graphics</i>, vol. 32, no. 4. ACM, 2013.","chicago":"Bernstein, Gilbert, and Chris Wojtan. “Putting Holes in Holey Geometry: Topology Change for Arbitrary Surfaces.” <i>ACM Transactions on Graphics</i>. ACM, 2013. <a href=\"https://doi.org/10.1145/2461912.2462027\">https://doi.org/10.1145/2461912.2462027</a>.","mla":"Bernstein, Gilbert, and Chris Wojtan. “Putting Holes in Holey Geometry: Topology Change for Arbitrary Surfaces.” <i>ACM Transactions on Graphics</i>, vol. 32, no. 4, 34, ACM, 2013, doi:<a href=\"https://doi.org/10.1145/2461912.2462027\">10.1145/2461912.2462027</a>.","ista":"Bernstein G, Wojtan C. 2013. Putting holes in holey geometry: Topology change for arbitrary surfaces. ACM Transactions on Graphics. 32(4), 34.","ama":"Bernstein G, Wojtan C. Putting holes in holey geometry: Topology change for arbitrary surfaces. <i>ACM Transactions on Graphics</i>. 2013;32(4). doi:<a href=\"https://doi.org/10.1145/2461912.2462027\">10.1145/2461912.2462027</a>","apa":"Bernstein, G., &#38; Wojtan, C. (2013). Putting holes in holey geometry: Topology change for arbitrary surfaces. <i>ACM Transactions on Graphics</i>. ACM. <a href=\"https://doi.org/10.1145/2461912.2462027\">https://doi.org/10.1145/2461912.2462027</a>","short":"G. Bernstein, C. Wojtan, ACM Transactions on Graphics 32 (2013)."},"article_number":"34","has_accepted_license":"1","file_date_updated":"2020-07-14T12:45:41Z","publist_id":"4435","year":"2013","_id":"2467","external_id":{"isi":["000321840100003"]},"date_published":"2013-07-01T00:00:00Z","date_created":"2018-12-11T11:57:50Z","publication":"ACM Transactions on Graphics","type":"journal_article","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","day":"01","article_processing_charge":"No","file":[{"date_updated":"2020-07-14T12:45:41Z","checksum":"9c8425d62246996ca632c5a01870515b","content_type":"application/pdf","file_id":"4768","relation":"main_file","date_created":"2018-12-12T10:09:43Z","file_size":3514674,"access_level":"open_access","creator":"system","file_name":"IST-2016-604-v1+1_toptop2013.pdf"}],"quality_controlled":"1","abstract":[{"text":"This paper presents a method for computing topology changes for triangle meshes in an interactive geometric modeling environment. Most triangle meshes in practice do not exhibit desirable geometric properties, so we develop a solution that is independent of standard assumptions and robust to geometric errors. Specifically, we provide the first method for topology change applicable to arbitrary non-solid, non-manifold, non-closed, self-intersecting surfaces. We prove that this new method for topology change produces the expected conventional results when applied to solid (closed, manifold, non-self-intersecting) surfaces---that is, we prove a backwards-compatibility property relative to prior work. Beyond solid surfaces, we present empirical evidence that our method remains tolerant to a variety of surface aberrations through the incorporation of a novel error correction scheme. Finally, we demonstrate how topology change applied to non-solid objects enables wholly new and useful behaviors.","lang":"eng"}],"title":"Putting holes in holey geometry: Topology change for arbitrary surfaces","publisher":"ACM","oa":1,"doi":"10.1145/2461912.2462027","date_updated":"2025-09-29T14:13:25Z","status":"public"},{"month":"07","volume":32,"department":[{"_id":"ChWo"}],"author":[{"first_name":"Morten","id":"439F0C8C-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-4417-3224","full_name":"Bojsen-Hansen, Morten","last_name":"Bojsen-Hansen"},{"full_name":"Wojtan, Christopher J","last_name":"Wojtan","orcid":"0000-0001-6646-5546","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"isi":1,"publication_status":"published","scopus_import":"1","intvolume":"        32","ddc":["000"],"oa_version":"Submitted Version","language":[{"iso":"eng"}],"pubrep_id":"603","issue":"4","citation":{"ista":"Bojsen-Hansen M, Wojtan C. 2013. Liquid surface tracking with error compensation. ACM Transactions on Graphics. 32(4), 68.","ieee":"M. Bojsen-Hansen and C. Wojtan, “Liquid surface tracking with error compensation,” <i>ACM Transactions on Graphics</i>, vol. 32, no. 4. ACM, 2013.","chicago":"Bojsen-Hansen, Morten, and Chris Wojtan. “Liquid Surface Tracking with Error Compensation.” <i>ACM Transactions on Graphics</i>. ACM, 2013. <a href=\"https://doi.org/10.1145/2461912.2461991\">https://doi.org/10.1145/2461912.2461991</a>.","mla":"Bojsen-Hansen, Morten, and Chris Wojtan. “Liquid Surface Tracking with Error Compensation.” <i>ACM Transactions on Graphics</i>, vol. 32, no. 4, 68, ACM, 2013, doi:<a href=\"https://doi.org/10.1145/2461912.2461991\">10.1145/2461912.2461991</a>.","short":"M. Bojsen-Hansen, C. Wojtan, ACM Transactions on Graphics 32 (2013).","ama":"Bojsen-Hansen M, Wojtan C. Liquid surface tracking with error compensation. <i>ACM Transactions on Graphics</i>. 2013;32(4). doi:<a href=\"https://doi.org/10.1145/2461912.2461991\">10.1145/2461912.2461991</a>","apa":"Bojsen-Hansen, M., &#38; Wojtan, C. (2013). Liquid surface tracking with error compensation. <i>ACM Transactions on Graphics</i>. ACM. <a href=\"https://doi.org/10.1145/2461912.2461991\">https://doi.org/10.1145/2461912.2461991</a>"},"corr_author":"1","article_number":"68","has_accepted_license":"1","publication":"ACM Transactions on Graphics","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","type":"journal_article","day":"01","article_processing_charge":"No","file_date_updated":"2020-07-14T12:45:41Z","publist_id":"4434","year":"2013","_id":"2468","external_id":{"isi":["000321840100037"]},"date_published":"2013-07-01T00:00:00Z","date_created":"2018-12-11T11:57:50Z","oa":1,"date_updated":"2025-09-29T14:12:53Z","status":"public","doi":"10.1145/2461912.2461991","file":[{"date_created":"2018-12-12T10:09:37Z","relation":"main_file","access_level":"open_access","file_size":5813685,"creator":"system","file_name":"IST-2016-603-v1+1_liquidError_web.pdf","date_updated":"2020-07-14T12:45:41Z","checksum":"53d905e0180e23ef3e813b969ffed4e1","content_type":"application/pdf","file_id":"4761"}],"title":"Liquid surface tracking with error compensation","abstract":[{"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.","lang":"eng"}],"quality_controlled":"1","publisher":"ACM"}]