[{"external_id":{"isi":["000802723900027"]},"status":"public","intvolume":"        41","citation":{"short":"C. Schreck, C. Wojtan, Computer Graphics Forum 41 (2022) 343–353.","chicago":"Schreck, Camille, and Chris Wojtan. “Coupling 3D Liquid Simulation with 2D Wave Propagation for Large Scale Water Surface Animation Using the Equivalent Sources Method.” <i>Computer Graphics Forum</i>. Wiley, 2022. <a href=\"https://doi.org/10.1111/cgf.14478\">https://doi.org/10.1111/cgf.14478</a>.","ieee":"C. Schreck and C. Wojtan, “Coupling 3D liquid simulation with 2D wave propagation for large scale water surface animation using the equivalent sources method,” <i>Computer Graphics Forum</i>, vol. 41, no. 2. Wiley, pp. 343–353, 2022.","apa":"Schreck, C., &#38; Wojtan, C. (2022). Coupling 3D liquid simulation with 2D wave propagation for large scale water surface animation using the equivalent sources method. <i>Computer Graphics Forum</i>. Wiley. <a href=\"https://doi.org/10.1111/cgf.14478\">https://doi.org/10.1111/cgf.14478</a>","mla":"Schreck, Camille, and Chris Wojtan. “Coupling 3D Liquid Simulation with 2D Wave Propagation for Large Scale Water Surface Animation Using the Equivalent Sources Method.” <i>Computer Graphics Forum</i>, vol. 41, no. 2, Wiley, 2022, pp. 343–53, doi:<a href=\"https://doi.org/10.1111/cgf.14478\">10.1111/cgf.14478</a>.","ista":"Schreck C, Wojtan C. 2022. Coupling 3D liquid simulation with 2D wave propagation for large scale water surface animation using the equivalent sources method. Computer Graphics Forum. 41(2), 343–353.","ama":"Schreck C, Wojtan C. Coupling 3D liquid simulation with 2D wave propagation for large scale water surface animation using the equivalent sources method. <i>Computer Graphics Forum</i>. 2022;41(2):343-353. doi:<a href=\"https://doi.org/10.1111/cgf.14478\">10.1111/cgf.14478</a>"},"oa":1,"publication_status":"published","date_published":"2022-05-01T00:00:00Z","main_file_link":[{"open_access":"1","url":"https://hal.archives-ouvertes.fr/hal-03641349/"}],"acknowledged_ssus":[{"_id":"ScienComp"}],"acknowledgement":"We wish to thank the anonymous reviewers and the members of the Visual Computing Group at IST Austria and MFX Team at INRIA for their valuable feedback. This research was supported by the Scientific Service Units (SSU) of IST Austria through resources provided by Scientific Computing. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 638176.","year":"2022","_id":"11432","page":"343-353","abstract":[{"text":"This paper proposes a method for simulating liquids in large bodies of water by coupling together a water surface wave simulator with a 3D Navier-Stokes simulator. The surface wave simulation uses the equivalent sources method (ESM) to efficiently animate large bodies of water with precisely controllable wave propagation behavior. The 3D liquid simulator animates complex non-linear fluid behaviors like splashes and breaking waves using off-the-shelf simulators using FLIP or the level set method with semi-Lagrangian advection.\r\nWe combine the two approaches by using the 3D solver to animate localized non-linear behaviors, and the 2D wave solver to animate larger regions with linear surface physics. We use the surface motion from the 3D solver as boundary conditions for 2D surface wave simulator, and we use the velocity and surface heights from the 2D surface wave simulator as boundary conditions for the 3D fluid simulation. We also introduce a novel technique for removing visual artifacts caused by numerical errors in 3D fluid solvers: we use experimental data to estimate the artificial dispersion caused by the 3D solver and we then carefully tune the wave speeds of the 2D solver to match it, effectively eliminating any differences in wave behavior across the boundary. To the best of our knowledge, this is the first time such a empirically driven error compensation approach has been used to remove coupling errors from a physics simulator.\r\nOur coupled simulation approach leverages the strengths of each simulation technique, animating large environments with seamless transitions between 2D and 3D physics.","lang":"eng"}],"date_updated":"2023-08-02T06:44:05Z","type":"journal_article","month":"05","oa_version":"Submitted Version","volume":41,"date_created":"2022-06-05T22:01:49Z","project":[{"_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176"}],"isi":1,"language":[{"iso":"eng"}],"issue":"2","publication_identifier":{"issn":["0167-7055"],"eissn":["1467-8659"]},"doi":"10.1111/cgf.14478","quality_controlled":"1","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publisher":"Wiley","department":[{"_id":"ChWo"}],"publication":"Computer Graphics Forum","article_processing_charge":"No","ec_funded":1,"scopus_import":"1","article_type":"original","author":[{"full_name":"Schreck, Camille","id":"2B14B676-F248-11E8-B48F-1D18A9856A87","last_name":"Schreck","first_name":"Camille"},{"full_name":"Wojtan, Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546","last_name":"Wojtan","first_name":"Christopher J"}],"day":"01","title":"Coupling 3D liquid simulation with 2D wave propagation for large scale water surface animation using the equivalent sources method"},{"department":[{"_id":"GradSch"},{"_id":"ChWo"}],"user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","publisher":"Institute of Science and Technology Austria","article_processing_charge":"No","ec_funded":1,"file":[{"date_created":"2023-01-25T12:04:41Z","title":"Thesis","access_level":"open_access","date_updated":"2023-02-02T09:29:57Z","file_id":"12371","description":"This is the main PDF file of the thesis. File size: 105 MB","checksum":"083722acbb8115e52e3b0fdec6226769","relation":"main_file","content_type":"application/pdf","file_size":104497530,"creator":"cchlebak","file_name":"thesis_gsperl.pdf"},{"relation":"main_file","content_type":"application/pdf","file_size":23183710,"creator":"cchlebak","file_name":"thesis_gsperl_compressed.pdf","date_created":"2023-02-02T09:33:37Z","title":"Thesis (compressed 23MB)","access_level":"open_access","date_updated":"2023-02-02T09:33:37Z","file_id":"12483","description":"This version of the thesis uses stronger image compression for a smaller file size of 23MB.","checksum":"511f82025e5fcb70bff4731d6896ca07"},{"date_updated":"2023-02-02T09:39:25Z","file_id":"12484","checksum":"ed4cb85225eedff761c25bddfc37a2ed","date_created":"2023-02-02T09:39:25Z","access_level":"open_access","file_name":"thesis-source.zip","relation":"source_file","content_type":"application/x-zip-compressed","file_size":98382247,"creator":"cchlebak"}],"day":"22","author":[{"id":"4DD40360-F248-11E8-B48F-1D18A9856A87","full_name":"Sperl, Georg","first_name":"Georg","last_name":"Sperl"}],"degree_awarded":"PhD","title":"Homogenizing yarn simulations: Large-scale mechanics, small-scale detail, and quantitative fitting","project":[{"grant_number":"638176","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"}],"language":[{"iso":"eng"}],"publication_identifier":{"isbn":["978-3-99078-020-6"],"issn":["2663-337X"]},"doi":"10.15479/at:ista:12103","year":"2022","_id":"12358","oa_version":"Published Version","month":"09","type":"dissertation","date_updated":"2024-02-28T12:57:46Z","abstract":[{"lang":"eng","text":"The complex yarn structure of knitted and woven fabrics gives rise to both a mechanical and\r\nvisual complexity. The small-scale interactions of yarns colliding with and pulling on each\r\nother result in drastically different large-scale stretching and bending behavior, introducing\r\nanisotropy, curling, and more. While simulating cloth as individual yarns can reproduce this\r\ncomplexity and match the quality of real fabric, it may be too computationally expensive for\r\nlarge fabrics. On the other hand, continuum-based approaches do not need to discretize the\r\ncloth at a stitch-level, but it is non-trivial to find a material model that would replicate the\r\nlarge-scale behavior of yarn fabrics, and they discard the intricate visual detail. In this thesis,\r\nwe discuss three methods to try and bridge the gap between small-scale and large-scale yarn\r\nmechanics using numerical homogenization: fitting a continuum model to periodic yarn simulations, adding mechanics-aware yarn detail onto thin-shell simulations, and quantitatively\r\nfitting yarn parameters to physical measurements of real fabric.\r\nTo start, we present a method for animating yarn-level cloth effects using a thin-shell solver.\r\nWe first use a large number of periodic yarn-level simulations to build a model of the potential\r\nenergy density of the cloth, and then use it to compute forces in a thin-shell simulator. The\r\nresulting simulations faithfully reproduce expected effects like the stiffening of woven fabrics\r\nand the highly deformable nature and anisotropy of knitted fabrics at a fraction of the cost of\r\nfull yarn-level simulation.\r\nWhile our thin-shell simulations are able to capture large-scale yarn mechanics, they lack\r\nthe rich visual detail of yarn-level simulations. Therefore, we propose a method to animate\r\nyarn-level cloth geometry on top of an underlying deforming mesh in a mechanics-aware\r\nfashion in real time. Using triangle strains to interpolate precomputed yarn geometry, we are\r\nable to reproduce effects such as knit loops tightening under stretching at negligible cost.\r\nFinally, we introduce a methodology for inverse-modeling of yarn-level mechanics of cloth,\r\nbased on the mechanical response of fabrics in the real world. We compile a database from\r\nphysical tests of several knitted fabrics used in the textile industry spanning diverse physical\r\nproperties like stiffness, nonlinearity, and anisotropy. We then develop a system for approximating these mechanical responses with yarn-level cloth simulation, using homogenized\r\nshell models to speed up computation and adding some small-but-necessary extensions to\r\nyarn-level models used in computer graphics.\r\n"}],"page":"138","file_date_updated":"2023-02-02T09:39:25Z","date_created":"2023-01-24T10:49:46Z","status":"public","alternative_title":["ISTA Thesis"],"citation":{"short":"G. Sperl, Homogenizing Yarn Simulations: Large-Scale Mechanics, Small-Scale Detail, and Quantitative Fitting, Institute of Science and Technology Austria, 2022.","ieee":"G. Sperl, “Homogenizing yarn simulations: Large-scale mechanics, small-scale detail, and quantitative fitting,” Institute of Science and Technology Austria, 2022.","chicago":"Sperl, Georg. “Homogenizing Yarn Simulations: Large-Scale Mechanics, Small-Scale Detail, and Quantitative Fitting.” Institute of Science and Technology Austria, 2022. <a href=\"https://doi.org/10.15479/at:ista:12103\">https://doi.org/10.15479/at:ista:12103</a>.","ista":"Sperl G. 2022. Homogenizing yarn simulations: Large-scale mechanics, small-scale detail, and quantitative fitting. Institute of Science and Technology Austria.","mla":"Sperl, Georg. <i>Homogenizing Yarn Simulations: Large-Scale Mechanics, Small-Scale Detail, and Quantitative Fitting</i>. Institute of Science and Technology Austria, 2022, doi:<a href=\"https://doi.org/10.15479/at:ista:12103\">10.15479/at:ista:12103</a>.","apa":"Sperl, G. (2022). <i>Homogenizing yarn simulations: Large-scale mechanics, small-scale detail, and quantitative fitting</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/at:ista:12103\">https://doi.org/10.15479/at:ista:12103</a>","ama":"Sperl G. Homogenizing yarn simulations: Large-scale mechanics, small-scale detail, and quantitative fitting. 2022. doi:<a href=\"https://doi.org/10.15479/at:ista:12103\">10.15479/at:ista:12103</a>"},"related_material":{"record":[{"status":"public","id":"11736","relation":"part_of_dissertation"},{"id":"9818","status":"public","relation":"part_of_dissertation"},{"relation":"part_of_dissertation","id":"8385","status":"public"}]},"has_accepted_license":"1","publication_status":"published","oa":1,"acknowledged_ssus":[{"_id":"SSU"}],"ddc":["000","620"],"date_published":"2022-09-22T00:00:00Z","supervisor":[{"orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J","first_name":"Christopher J","last_name":"Wojtan"}]},{"intvolume":"        40","related_material":{"record":[{"id":"12358","status":"public","relation":"dissertation_contains"},{"relation":"software","id":"9327","status":"public"}],"link":[{"url":"https://ist.ac.at/en/news/knitting-virtual-yarn/","description":"News on IST Webpage","relation":"press_release"}]},"citation":{"ama":"Sperl G, Narain R, Wojtan C. Mechanics-aware deformation of yarn pattern geometry. <i>ACM Transactions on Graphics</i>. 2021;40(4). doi:<a href=\"https://doi.org/10.1145/3450626.3459816\">10.1145/3450626.3459816</a>","mla":"Sperl, Georg, et al. “Mechanics-Aware Deformation of Yarn Pattern Geometry.” <i>ACM Transactions on Graphics</i>, vol. 40, no. 4, 168, Association for Computing Machinery, 2021, doi:<a href=\"https://doi.org/10.1145/3450626.3459816\">10.1145/3450626.3459816</a>.","ista":"Sperl G, Narain R, Wojtan C. 2021. Mechanics-aware deformation of yarn pattern geometry. ACM Transactions on Graphics. 40(4), 168.","apa":"Sperl, G., Narain, R., &#38; Wojtan, C. (2021). Mechanics-aware deformation of yarn pattern geometry. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3450626.3459816\">https://doi.org/10.1145/3450626.3459816</a>","ieee":"G. Sperl, R. Narain, and C. Wojtan, “Mechanics-aware deformation of yarn pattern geometry,” <i>ACM Transactions on Graphics</i>, vol. 40, no. 4. Association for Computing Machinery, 2021.","chicago":"Sperl, Georg, Rahul Narain, and Chris Wojtan. “Mechanics-Aware Deformation of Yarn Pattern Geometry.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2021. <a href=\"https://doi.org/10.1145/3450626.3459816\">https://doi.org/10.1145/3450626.3459816</a>.","short":"G. Sperl, R. Narain, C. Wojtan, ACM Transactions on Graphics 40 (2021)."},"external_id":{"isi":["000674930900132"]},"status":"public","date_published":"2021-08-01T00:00:00Z","acknowledged_ssus":[{"_id":"ScienComp"}],"main_file_link":[{"url":"https://doi.org/10.1145/3450626.3459816","open_access":"1"}],"oa":1,"publication_status":"published","_id":"9818","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.","year":"2021","volume":40,"date_created":"2021-08-08T22:01:27Z","oa_version":"Published Version","month":"08","type":"journal_article","date_updated":"2023-08-10T14:24:36Z","abstract":[{"text":"Triangle mesh-based simulations are able to produce satisfying animations of knitted and woven cloth; however, they lack the rich geometric detail of yarn-level simulations. Naive texturing approaches do not consider yarn-level physics, while full yarn-level simulations may become prohibitively expensive for large garments. We propose a method to animate yarn-level cloth geometry on top of an underlying deforming mesh in a mechanics-aware fashion. Using triangle strains to interpolate precomputed yarn geometry, we are able to reproduce effects such as knit loops tightening under stretching. In combination with precomputed mesh animation or real-time mesh simulation, our method is able to animate yarn-level cloth in real-time at large scales.","lang":"eng"}],"isi":1,"issue":"4","language":[{"iso":"eng"}],"project":[{"_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176"}],"doi":"10.1145/3450626.3459816","quality_controlled":"1","publication_identifier":{"eissn":["15577368"],"issn":["07300301"]},"publication":"ACM Transactions on Graphics","article_type":"original","ec_funded":1,"scopus_import":"1","article_processing_charge":"Yes (in subscription journal)","publisher":"Association for Computing Machinery","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","department":[{"_id":"GradSch"},{"_id":"ChWo"}],"article_number":"168","title":"Mechanics-aware deformation of yarn pattern geometry","author":[{"full_name":"Sperl, Georg","id":"4DD40360-F248-11E8-B48F-1D18A9856A87","last_name":"Sperl","first_name":"Georg"},{"first_name":"Rahul","last_name":"Narain","full_name":"Narain, Rahul"},{"last_name":"Wojtan","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J"}],"day":"01"},{"intvolume":"        15","citation":{"ista":"Edelsbrunner H, Nikitenko A, Ölsböck K, Synak P. 2020. Radius functions on Poisson–Delaunay mosaics and related complexes experimentally. Topological Data Analysis. , Abel Symposia, vol. 15, 181–218.","mla":"Edelsbrunner, Herbert, et al. “Radius Functions on Poisson–Delaunay Mosaics and Related Complexes Experimentally.” <i>Topological Data Analysis</i>, vol. 15, Springer Nature, 2020, pp. 181–218, doi:<a href=\"https://doi.org/10.1007/978-3-030-43408-3_8\">10.1007/978-3-030-43408-3_8</a>.","apa":"Edelsbrunner, H., Nikitenko, A., Ölsböck, K., &#38; Synak, P. (2020). Radius functions on Poisson–Delaunay mosaics and related complexes experimentally. In <i>Topological Data Analysis</i> (Vol. 15, pp. 181–218). Springer Nature. <a href=\"https://doi.org/10.1007/978-3-030-43408-3_8\">https://doi.org/10.1007/978-3-030-43408-3_8</a>","ama":"Edelsbrunner H, Nikitenko A, Ölsböck K, Synak P. Radius functions on Poisson–Delaunay mosaics and related complexes experimentally. In: <i>Topological Data Analysis</i>. Vol 15. Springer Nature; 2020:181-218. doi:<a href=\"https://doi.org/10.1007/978-3-030-43408-3_8\">10.1007/978-3-030-43408-3_8</a>","short":"H. Edelsbrunner, A. Nikitenko, K. Ölsböck, P. Synak, in:, Topological Data Analysis, Springer Nature, 2020, pp. 181–218.","ieee":"H. Edelsbrunner, A. Nikitenko, K. Ölsböck, and P. Synak, “Radius functions on Poisson–Delaunay mosaics and related complexes experimentally,” in <i>Topological Data Analysis</i>, 2020, vol. 15, pp. 181–218.","chicago":"Edelsbrunner, Herbert, Anton Nikitenko, Katharina Ölsböck, and Peter Synak. “Radius Functions on Poisson–Delaunay Mosaics and Related Complexes Experimentally.” In <i>Topological Data Analysis</i>, 15:181–218. Springer Nature, 2020. <a href=\"https://doi.org/10.1007/978-3-030-43408-3_8\">https://doi.org/10.1007/978-3-030-43408-3_8</a>."},"alternative_title":["Abel Symposia"],"status":"public","ddc":["510"],"date_published":"2020-06-22T00:00:00Z","publication_status":"published","oa":1,"has_accepted_license":"1","_id":"8135","acknowledgement":"This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreements No 78818 Alpha and No 638176). It is also partially supported by the DFG Collaborative Research Center TRR 109, ‘Discretization in Geometry and Dynamics’, through grant no. I02979-N35 of the Austrian Science Fund (FWF).","year":"2020","volume":15,"file_date_updated":"2020-10-08T08:56:14Z","date_created":"2020-07-19T22:00:59Z","page":"181-218","month":"06","oa_version":"Submitted Version","type":"conference","date_updated":"2021-01-12T08:17:06Z","abstract":[{"lang":"eng","text":"Discrete Morse theory has recently lead to new developments in the theory of random geometric complexes. This article surveys the methods and results obtained with this new approach, and discusses some of its shortcomings. It uses simulations to illustrate the results and to form conjectures, getting numerical estimates for combinatorial, topological, and geometric properties of weighted and unweighted Delaunay mosaics, their dual Voronoi tessellations, and the Alpha and Wrap complexes contained in the mosaics."}],"language":[{"iso":"eng"}],"project":[{"grant_number":"788183","_id":"266A2E9E-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Alpha Shape Theory Extended"},{"grant_number":"638176","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"},{"grant_number":"I02979-N35","call_identifier":"FWF","_id":"2561EBF4-B435-11E9-9278-68D0E5697425","name":"Persistence and stability of geometric complexes"}],"doi":"10.1007/978-3-030-43408-3_8","quality_controlled":"1","publication_identifier":{"issn":["21932808"],"isbn":["9783030434076"],"eissn":["21978549"]},"publication":"Topological Data Analysis","ec_funded":1,"article_processing_charge":"No","scopus_import":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Springer Nature","department":[{"_id":"HeEd"}],"title":"Radius functions on Poisson–Delaunay mosaics and related complexes experimentally","author":[{"last_name":"Edelsbrunner","first_name":"Herbert","full_name":"Edelsbrunner, Herbert","id":"3FB178DA-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-9823-6833"},{"last_name":"Nikitenko","first_name":"Anton","id":"3E4FF1BA-F248-11E8-B48F-1D18A9856A87","full_name":"Nikitenko, Anton"},{"first_name":"Katharina","last_name":"Ölsböck","full_name":"Ölsböck, Katharina","id":"4D4AA390-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Synak","first_name":"Peter","id":"331776E2-F248-11E8-B48F-1D18A9856A87","full_name":"Synak, Peter"}],"file":[{"relation":"main_file","content_type":"application/pdf","file_size":2207071,"creator":"dernst","success":1,"file_name":"2020-B-01-PoissonExperimentalSurvey.pdf","date_created":"2020-10-08T08:56:14Z","access_level":"open_access","date_updated":"2020-10-08T08:56:14Z","file_id":"8628","checksum":"7b5e0de10675d787a2ddb2091370b8d8"}],"day":"22"},{"publication_status":"published","oa":1,"has_accepted_license":"1","ddc":["000"],"date_published":"2020-07-08T00:00:00Z","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1145/3386569.3392405"}],"acknowledged_ssus":[{"_id":"ScienComp"}],"status":"public","external_id":{"isi":["000583700300004"]},"intvolume":"        39","citation":{"apa":"Ishida, S., Synak, P., Narita, F., Hachisuka, T., &#38; Wojtan, C. (2020). A model for soap film dynamics with evolving thickness. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3386569.3392405\">https://doi.org/10.1145/3386569.3392405</a>","mla":"Ishida, Sadashige, et al. “A Model for Soap Film Dynamics with Evolving Thickness.” <i>ACM Transactions on Graphics</i>, vol. 39, no. 4, 31, Association for Computing Machinery, 2020, doi:<a href=\"https://doi.org/10.1145/3386569.3392405\">10.1145/3386569.3392405</a>.","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.","ama":"Ishida S, Synak P, Narita F, Hachisuka T, Wojtan C. A model for soap film dynamics with evolving thickness. <i>ACM Transactions on Graphics</i>. 2020;39(4). doi:<a href=\"https://doi.org/10.1145/3386569.3392405\">10.1145/3386569.3392405</a>","short":"S. Ishida, P. Synak, F. Narita, T. Hachisuka, C. Wojtan, ACM Transactions on Graphics 39 (2020).","chicago":"Ishida, Sadashige, Peter Synak, Fumiya Narita, Toshiya Hachisuka, and Chris Wojtan. “A Model for Soap Film Dynamics with Evolving Thickness.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2020. <a href=\"https://doi.org/10.1145/3386569.3392405\">https://doi.org/10.1145/3386569.3392405</a>.","ieee":"S. Ishida, P. Synak, F. Narita, T. Hachisuka, and C. Wojtan, “A model for soap film dynamics with evolving thickness,” <i>ACM Transactions on Graphics</i>, vol. 39, no. 4. Association for Computing Machinery, 2020."},"abstract":[{"lang":"eng","text":"Previous research on animations of soap bubbles, films, and foams largely focuses on the motion and geometric shape of the bubble surface. These works neglect the evolution of the bubble’s thickness, which is normally responsible for visual phenomena like surface vortices, Newton’s interference patterns, capillary waves, and deformation-dependent rupturing of films in a foam. In this paper, we model these natural phenomena by introducing the film thickness as a reduced degree of freedom in the Navier-Stokes equations and deriving their equations of motion. We discretize the equations on a nonmanifold triangle mesh surface and couple it to an existing bubble solver. In doing so, we also introduce an incompressible fluid solver for 2.5D films and a novel advection algorithm for convecting fields across non-manifold surface junctions. Our simulations enhance state-of-the-art bubble solvers with additional effects caused by convection, rippling, draining, and evaporation of the thin film."}],"date_updated":"2024-02-28T12:57:31Z","type":"journal_article","oa_version":"Submitted Version","month":"07","volume":39,"date_created":"2020-09-13T22:01:18Z","file_date_updated":"2020-11-23T09:03:19Z","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.","year":"2020","_id":"8384","publication_identifier":{"issn":["07300301"],"eissn":["15577368"]},"doi":"10.1145/3386569.3392405","quality_controlled":"1","project":[{"grant_number":"638176","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"}],"isi":1,"language":[{"iso":"eng"}],"issue":"4","author":[{"full_name":"Ishida, Sadashige","id":"6F7C4B96-A8E9-11E9-A7CA-09ECE5697425","first_name":"Sadashige","last_name":"Ishida"},{"last_name":"Synak","first_name":"Peter","full_name":"Synak, Peter","id":"331776E2-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Narita, Fumiya","last_name":"Narita","first_name":"Fumiya"},{"last_name":"Hachisuka","first_name":"Toshiya","full_name":"Hachisuka, Toshiya"},{"orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J","last_name":"Wojtan","first_name":"Christopher J"}],"day":"08","file":[{"creator":"dernst","content_type":"application/pdf","relation":"main_file","file_size":14935529,"success":1,"file_name":"2020_soapfilm_submitted.pdf","access_level":"open_access","date_created":"2020-11-23T09:03:19Z","checksum":"813831ca91319d794d9748c276b24578","date_updated":"2020-11-23T09:03:19Z","file_id":"8795"}],"title":"A model for soap film dynamics with evolving thickness","article_number":"31","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Association for Computing Machinery","department":[{"_id":"ChWo"}],"publication":"ACM Transactions on Graphics","ec_funded":1,"article_processing_charge":"No","scopus_import":"1","article_type":"original"},{"doi":"10.1145/3386569.3392412","quality_controlled":"1","publication_identifier":{"eissn":["15577368"],"issn":["07300301"]},"isi":1,"issue":"4","language":[{"iso":"eng"}],"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":"48","title":"Homogenized yarn-level cloth","author":[{"first_name":"Georg","last_name":"Sperl","id":"4DD40360-F248-11E8-B48F-1D18A9856A87","full_name":"Sperl, Georg"},{"first_name":"Rahul","last_name":"Narain","full_name":"Narain, Rahul"},{"last_name":"Wojtan","first_name":"Christopher J","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J"}],"file":[{"file_size":38922662,"relation":"main_file","content_type":"application/pdf","creator":"dernst","file_name":"2020_hylc_submitted.pdf","success":1,"date_created":"2020-11-23T09:01:22Z","access_level":"open_access","file_id":"8794","date_updated":"2020-11-23T09:01:22Z","checksum":"cf4c1d361c3196c4bd424520a5588205"}],"day":"08","publication":"ACM Transactions on Graphics","article_type":"original","article_processing_charge":"No","ec_funded":1,"scopus_import":"1","publisher":"Association for Computing Machinery","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","department":[{"_id":"ChWo"}],"ddc":["000"],"date_published":"2020-07-08T00:00:00Z","acknowledged_ssus":[{"_id":"ScienComp"}],"main_file_link":[{"url":"https://doi.org/10.1145/3386569.3392412","open_access":"1"}],"publication_status":"published","oa":1,"has_accepted_license":"1","intvolume":"        39","related_material":{"record":[{"status":"public","id":"12358","relation":"dissertation_contains"}]},"citation":{"ama":"Sperl G, Narain R, Wojtan C. Homogenized yarn-level cloth. <i>ACM Transactions on Graphics</i>. 2020;39(4). doi:<a href=\"https://doi.org/10.1145/3386569.3392412\">10.1145/3386569.3392412</a>","mla":"Sperl, Georg, et al. “Homogenized Yarn-Level Cloth.” <i>ACM Transactions on Graphics</i>, vol. 39, no. 4, 48, Association for Computing Machinery, 2020, doi:<a href=\"https://doi.org/10.1145/3386569.3392412\">10.1145/3386569.3392412</a>.","ista":"Sperl G, Narain R, Wojtan C. 2020. Homogenized yarn-level cloth. ACM Transactions on Graphics. 39(4), 48.","apa":"Sperl, G., Narain, R., &#38; Wojtan, C. (2020). Homogenized yarn-level cloth. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3386569.3392412\">https://doi.org/10.1145/3386569.3392412</a>","ieee":"G. Sperl, R. Narain, and C. Wojtan, “Homogenized yarn-level cloth,” <i>ACM Transactions on Graphics</i>, vol. 39, no. 4. Association for Computing Machinery, 2020.","chicago":"Sperl, Georg, Rahul Narain, and Chris Wojtan. “Homogenized Yarn-Level Cloth.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2020. <a href=\"https://doi.org/10.1145/3386569.3392412\">https://doi.org/10.1145/3386569.3392412</a>.","short":"G. Sperl, R. Narain, C. Wojtan, ACM Transactions on Graphics 39 (2020)."},"status":"public","external_id":{"isi":["000583700300021"]},"volume":39,"date_created":"2020-09-13T22:01:18Z","file_date_updated":"2020-11-23T09:01:22Z","type":"journal_article","month":"07","oa_version":"Submitted Version","date_updated":"2024-02-28T12:57:47Z","abstract":[{"lang":"eng","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."}],"_id":"8385","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.","year":"2020"},{"_id":"8535","year":"2020","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.","date_created":"2020-09-20T22:01:37Z","file_date_updated":"2020-09-21T07:51:44Z","volume":39,"month":"07","oa_version":"Published Version","type":"journal_article","date_updated":"2023-08-22T09:28:27Z","abstract":[{"lang":"eng","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."}],"citation":{"ieee":"T. Skrivan, A. Soderstrom, J. Johansson, C. Sprenger, K. Museth, and C. Wojtan, “Wave curves: Simulating Lagrangian water waves on dynamically deforming surfaces,” <i>ACM Transactions on Graphics</i>, vol. 39, no. 4. Association for Computing Machinery, 2020.","chicago":"Skrivan, Tomas, Andreas Soderstrom, John Johansson, Christoph Sprenger, Ken Museth, and Chris Wojtan. “Wave Curves: Simulating Lagrangian Water Waves on Dynamically Deforming Surfaces.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2020. <a href=\"https://doi.org/10.1145/3386569.3392466\">https://doi.org/10.1145/3386569.3392466</a>.","short":"T. Skrivan, A. Soderstrom, J. Johansson, C. Sprenger, K. Museth, C. Wojtan, ACM Transactions on Graphics 39 (2020).","ama":"Skrivan T, Soderstrom A, Johansson J, Sprenger C, Museth K, Wojtan C. Wave curves: Simulating Lagrangian water waves on dynamically deforming surfaces. <i>ACM Transactions on Graphics</i>. 2020;39(4). doi:<a href=\"https://doi.org/10.1145/3386569.3392466\">10.1145/3386569.3392466</a>","mla":"Skrivan, Tomas, et al. “Wave Curves: Simulating Lagrangian Water Waves on Dynamically Deforming Surfaces.” <i>ACM Transactions on Graphics</i>, vol. 39, no. 4, 65, Association for Computing Machinery, 2020, doi:<a href=\"https://doi.org/10.1145/3386569.3392466\">10.1145/3386569.3392466</a>.","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.","apa":"Skrivan, T., Soderstrom, A., Johansson, J., Sprenger, C., Museth, K., &#38; Wojtan, C. (2020). Wave curves: Simulating Lagrangian water waves on dynamically deforming surfaces. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3386569.3392466\">https://doi.org/10.1145/3386569.3392466</a>"},"intvolume":"        39","external_id":{"isi":["000583700300038"]},"status":"public","acknowledged_ssus":[{"_id":"ScienComp"}],"ddc":["000"],"date_published":"2020-07-08T00:00:00Z","has_accepted_license":"1","publication_status":"published","oa":1,"article_type":"original","article_processing_charge":"No","ec_funded":1,"scopus_import":"1","publication":"ACM Transactions on Graphics","department":[{"_id":"ChWo"}],"publisher":"Association for Computing Machinery","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","article_number":"65","title":"Wave curves: Simulating Lagrangian water waves on dynamically deforming surfaces","file":[{"access_level":"open_access","date_created":"2020-09-21T07:51:44Z","checksum":"c3a680893f01cc4a9e961ff0a4cfa12f","date_updated":"2020-09-21T07:51:44Z","file_id":"8541","creator":"dernst","content_type":"application/pdf","relation":"main_file","file_size":20223953,"success":1,"file_name":"2020_ACM_Skrivan.pdf"}],"day":"08","author":[{"last_name":"Skrivan","first_name":"Tomas","full_name":"Skrivan, Tomas","id":"486A5A46-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Soderstrom, Andreas","first_name":"Andreas","last_name":"Soderstrom"},{"last_name":"Johansson","first_name":"John","full_name":"Johansson, John"},{"full_name":"Sprenger, Christoph","last_name":"Sprenger","first_name":"Christoph"},{"full_name":"Museth, Ken","last_name":"Museth","first_name":"Ken"},{"last_name":"Wojtan","first_name":"Christopher J","full_name":"Wojtan, Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546"}],"issue":"4","language":[{"iso":"eng"}],"isi":1,"project":[{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","grant_number":"638176"},{"grant_number":"665385","call_identifier":"H2020","_id":"2564DBCA-B435-11E9-9278-68D0E5697425","name":"International IST Doctoral Program"}],"quality_controlled":"1","doi":"10.1145/3386569.3392466","publication_identifier":{"eissn":["15577368"],"issn":["07300301"]}},{"external_id":{"isi":["000548709600008"]},"status":"public","citation":{"apa":"Schreck, C., &#38; Wojtan, C. (2020). A practical method for animating anisotropic elastoplastic materials. <i>Computer Graphics Forum</i>. Wiley. <a href=\"https://doi.org/10.1111/cgf.13914\">https://doi.org/10.1111/cgf.13914</a>","mla":"Schreck, Camille, and Chris Wojtan. “A Practical Method for Animating Anisotropic Elastoplastic Materials.” <i>Computer Graphics Forum</i>, vol. 39, no. 2, Wiley, 2020, pp. 89–99, doi:<a href=\"https://doi.org/10.1111/cgf.13914\">10.1111/cgf.13914</a>.","ista":"Schreck C, Wojtan C. 2020. A practical method for animating anisotropic elastoplastic materials. Computer Graphics Forum. 39(2), 89–99.","ama":"Schreck C, Wojtan C. A practical method for animating anisotropic elastoplastic materials. <i>Computer Graphics Forum</i>. 2020;39(2):89-99. doi:<a href=\"https://doi.org/10.1111/cgf.13914\">10.1111/cgf.13914</a>","short":"C. Schreck, C. Wojtan, Computer Graphics Forum 39 (2020) 89–99.","chicago":"Schreck, Camille, and Chris Wojtan. “A Practical Method for Animating Anisotropic Elastoplastic Materials.” <i>Computer Graphics Forum</i>. Wiley, 2020. <a href=\"https://doi.org/10.1111/cgf.13914\">https://doi.org/10.1111/cgf.13914</a>.","ieee":"C. Schreck and C. Wojtan, “A practical method for animating anisotropic elastoplastic materials,” <i>Computer Graphics Forum</i>, vol. 39, no. 2. Wiley, pp. 89–99, 2020."},"intvolume":"        39","has_accepted_license":"1","publication_status":"published","oa":1,"acknowledged_ssus":[{"_id":"ScienComp"}],"date_published":"2020-05-01T00:00:00Z","ddc":["000"],"year":"2020","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":"8765","date_updated":"2023-09-05T16:00:13Z","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"}],"type":"journal_article","month":"05","oa_version":"Submitted Version","page":"89-99","date_created":"2020-11-17T09:35:10Z","file_date_updated":"2020-11-23T09:05:13Z","volume":39,"project":[{"grant_number":"638176","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"}],"language":[{"iso":"eng"}],"issue":"2","isi":1,"keyword":["Computer Networks and Communications"],"publication_identifier":{"issn":["0167-7055"],"eissn":["1467-8659"]},"quality_controlled":"1","doi":"10.1111/cgf.13914","department":[{"_id":"ChWo"}],"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","publisher":"Wiley","ec_funded":1,"article_processing_charge":"No","scopus_import":"1","article_type":"original","publication":"Computer Graphics Forum","file":[{"content_type":"application/pdf","relation":"main_file","file_size":38969122,"creator":"dernst","success":1,"file_name":"2020_poff_revisited.pdf","date_created":"2020-11-23T09:05:13Z","access_level":"open_access","date_updated":"2020-11-23T09:05:13Z","file_id":"8796","checksum":"7605f605acd84d0942b48bc7a1c2d72e"}],"day":"01","author":[{"last_name":"Schreck","first_name":"Camille","full_name":"Schreck, Camille","id":"2B14B676-F248-11E8-B48F-1D18A9856A87"},{"orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J","last_name":"Wojtan","first_name":"Christopher J"}],"title":"A practical method for animating anisotropic elastoplastic materials"},{"year":"2020","_id":"8766","page":"47-54","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."}],"date_updated":"2024-02-28T13:58:11Z","type":"journal_article","month":"12","oa_version":"None","volume":39,"date_created":"2020-11-17T10:47:48Z","status":"public","external_id":{"isi":["000591780400005"]},"intvolume":"        39","citation":{"ista":"Jeschke S, Hafner C, Chentanez N, Macklin M, Müller-Fischer M, Wojtan C. 2020. Making procedural water waves boundary-aware. Computer Graphics forum. 39(8), 47–54.","mla":"Jeschke, Stefan, et al. “Making Procedural Water Waves Boundary-Aware.” <i>Computer Graphics Forum</i>, vol. 39, no. 8, Wiley, 2020, pp. 47–54, doi:<a href=\"https://doi.org/10.1111/cgf.14100\">10.1111/cgf.14100</a>.","apa":"Jeschke, S., Hafner, C., Chentanez, N., Macklin, M., Müller-Fischer, M., &#38; Wojtan, C. (2020). Making procedural water waves boundary-aware. <i>Computer Graphics Forum</i>. Online Symposium: Wiley. <a href=\"https://doi.org/10.1111/cgf.14100\">https://doi.org/10.1111/cgf.14100</a>","ama":"Jeschke S, Hafner C, Chentanez N, Macklin M, Müller-Fischer M, Wojtan C. Making procedural water waves boundary-aware. <i>Computer Graphics forum</i>. 2020;39(8):47-54. doi:<a href=\"https://doi.org/10.1111/cgf.14100\">10.1111/cgf.14100</a>","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,” <i>Computer Graphics forum</i>, vol. 39, no. 8. Wiley, pp. 47–54, 2020.","chicago":"Jeschke, Stefan, Christian Hafner, Nuttapong Chentanez, Miles Macklin, Matthias Müller-Fischer, and Chris Wojtan. “Making Procedural Water Waves Boundary-Aware.” <i>Computer Graphics Forum</i>. Wiley, 2020. <a href=\"https://doi.org/10.1111/cgf.14100\">https://doi.org/10.1111/cgf.14100</a>."},"publication_status":"published","date_published":"2020-12-01T00:00:00Z","user_id":"2EBD1598-F248-11E8-B48F-1D18A9856A87","publisher":"Wiley","department":[{"_id":"ChWo"},{"_id":"BeBi"}],"publication":"Computer Graphics forum","scopus_import":"1","article_processing_charge":"No","ec_funded":1,"article_type":"original","author":[{"id":"44D6411A-F248-11E8-B48F-1D18A9856A87","full_name":"Jeschke, Stefan","first_name":"Stefan","last_name":"Jeschke"},{"first_name":"Christian","last_name":"Hafner","id":"400429CC-F248-11E8-B48F-1D18A9856A87","full_name":"Hafner, Christian"},{"full_name":"Chentanez, Nuttapong","first_name":"Nuttapong","last_name":"Chentanez"},{"full_name":"Macklin, Miles","first_name":"Miles","last_name":"Macklin"},{"first_name":"Matthias","last_name":"Müller-Fischer","full_name":"Müller-Fischer, Matthias"},{"first_name":"Christopher J","last_name":"Wojtan","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J"}],"day":"01","title":"Making procedural water waves boundary-aware","project":[{"call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176"},{"grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"isi":1,"conference":{"end_date":"2020-10-09","start_date":"2020-10-06","name":"SCA: Symposium on Computer Animation","location":"Online Symposium"},"language":[{"iso":"eng"}],"issue":"8","doi":"10.1111/cgf.14100","quality_controlled":"1"},{"department":[{"_id":"ChWo"}],"publisher":"ACM","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","article_processing_charge":"No","scopus_import":"1","ec_funded":1,"publication":"ACM Transactions on Graphics","file":[{"date_created":"2019-05-14T07:03:55Z","access_level":"open_access","file_id":"6443","date_updated":"2020-07-14T12:47:30Z","checksum":"1b737dfe3e051aba8f3f4ab1dceda673","file_size":44328918,"relation":"main_file","content_type":"application/pdf","creator":"dernst","file_name":"2019_ACM_Schreck.pdf"}],"day":"01","author":[{"first_name":"Camille","last_name":"Schreck","full_name":"Schreck, Camille","id":"2B14B676-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Christian","last_name":"Hafner","full_name":"Hafner, Christian","id":"400429CC-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Christopher J","last_name":"Wojtan","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J"}],"title":"Fundamental solutions for water wave animation","article_number":"130","project":[{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"638176"},{"grant_number":"715767","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling"},{"grant_number":"665385","name":"International IST Doctoral Program","_id":"2564DBCA-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"language":[{"iso":"eng"}],"issue":"4","isi":1,"quality_controlled":"1","doi":"10.1145/3306346.3323002","year":"2019","_id":"6442","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."}],"date_updated":"2023-08-25T10:18:46Z","type":"journal_article","oa_version":"Submitted Version","month":"07","date_created":"2019-05-14T07:04:06Z","file_date_updated":"2020-07-14T12:47:30Z","volume":38,"status":"public","external_id":{"isi":["000475740600104"]},"citation":{"apa":"Schreck, C., Hafner, C., &#38; Wojtan, C. (2019). Fundamental solutions for water wave animation. <i>ACM Transactions on Graphics</i>. ACM. <a href=\"https://doi.org/10.1145/3306346.3323002\">https://doi.org/10.1145/3306346.3323002</a>","mla":"Schreck, Camille, et al. “Fundamental Solutions for Water Wave Animation.” <i>ACM Transactions on Graphics</i>, vol. 38, no. 4, 130, ACM, 2019, doi:<a href=\"https://doi.org/10.1145/3306346.3323002\">10.1145/3306346.3323002</a>.","ista":"Schreck C, Hafner C, Wojtan C. 2019. Fundamental solutions for water wave animation. ACM Transactions on Graphics. 38(4), 130.","ama":"Schreck C, Hafner C, Wojtan C. Fundamental solutions for water wave animation. <i>ACM Transactions on Graphics</i>. 2019;38(4). doi:<a href=\"https://doi.org/10.1145/3306346.3323002\">10.1145/3306346.3323002</a>","short":"C. Schreck, C. Hafner, C. Wojtan, ACM Transactions on Graphics 38 (2019).","chicago":"Schreck, Camille, Christian Hafner, and Chris Wojtan. “Fundamental Solutions for Water Wave Animation.” <i>ACM Transactions on Graphics</i>. ACM, 2019. <a href=\"https://doi.org/10.1145/3306346.3323002\">https://doi.org/10.1145/3306346.3323002</a>.","ieee":"C. Schreck, C. Hafner, and C. Wojtan, “Fundamental solutions for water wave animation,” <i>ACM Transactions on Graphics</i>, vol. 38, no. 4. ACM, 2019."},"related_material":{"link":[{"relation":"press_release","url":"https://ist.ac.at/en/news/new-method-makes-realistic-water-wave-animations-more-efficient/","description":"News on IST Homepage"}]},"intvolume":"        38","has_accepted_license":"1","publication_status":"published","oa":1,"acknowledged_ssus":[{"_id":"ScienComp"}],"ddc":["000","005"],"date_published":"2019-07-01T00:00:00Z"},{"oa_version":"Published Version","month":"07","type":"journal_article","date_updated":"2024-02-28T13:58:51Z","abstract":[{"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.","lang":"eng"}],"file_date_updated":"2020-07-14T12:44:45Z","date_created":"2018-12-11T11:44:48Z","volume":37,"year":"2018","_id":"134","has_accepted_license":"1","oa":1,"publication_status":"published","acknowledged_ssus":[{"_id":"ScienComp"}],"ddc":["000"],"date_published":"2018-07-30T00:00:00Z","external_id":{"isi":["000448185000055"]},"status":"public","alternative_title":["SIGGRAPH"],"citation":{"short":"S. Jeschke, T. Skrivan, M. Mueller Fischer, N. Chentanez, M. Macklin, C. Wojtan, ACM Transactions on Graphics 37 (2018).","chicago":"Jeschke, Stefan, Tomas Skrivan, Matthias Mueller Fischer, Nuttapong Chentanez, Miles Macklin, and Chris Wojtan. “Water Surface Wavelets.” <i>ACM Transactions on Graphics</i>. ACM, 2018. <a href=\"https://doi.org/10.1145/3197517.3201336\">https://doi.org/10.1145/3197517.3201336</a>.","ieee":"S. Jeschke, T. Skrivan, M. Mueller Fischer, N. Chentanez, M. Macklin, and C. Wojtan, “Water surface wavelets,” <i>ACM Transactions on Graphics</i>, vol. 37, no. 4. ACM, 2018.","apa":"Jeschke, S., Skrivan, T., Mueller Fischer, M., Chentanez, N., Macklin, M., &#38; Wojtan, C. (2018). Water surface wavelets. <i>ACM Transactions on Graphics</i>. ACM. <a href=\"https://doi.org/10.1145/3197517.3201336\">https://doi.org/10.1145/3197517.3201336</a>","mla":"Jeschke, Stefan, et al. “Water Surface Wavelets.” <i>ACM Transactions on Graphics</i>, vol. 37, no. 4, 94, ACM, 2018, doi:<a href=\"https://doi.org/10.1145/3197517.3201336\">10.1145/3197517.3201336</a>.","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.","ama":"Jeschke S, Skrivan T, Mueller Fischer M, Chentanez N, Macklin M, Wojtan C. Water surface wavelets. <i>ACM Transactions on Graphics</i>. 2018;37(4). doi:<a href=\"https://doi.org/10.1145/3197517.3201336\">10.1145/3197517.3201336</a>"},"related_material":{"link":[{"relation":"press_release","url":"https://ist.ac.at/en/news/new-water-simulation-captures-small-details-even-in-large-scenes/","description":"News on IST Homepage"}]},"intvolume":"        37","license":"https://creativecommons.org/licenses/by-nc-sa/4.0/","file":[{"access_level":"open_access","date_created":"2018-12-18T09:59:23Z","checksum":"db75ebabe2ec432bf41389e614d6ef62","file_id":"5744","date_updated":"2020-07-14T12:44:45Z","creator":"dernst","file_size":22185016,"content_type":"application/pdf","relation":"main_file","file_name":"2018_ACM_Jeschke.pdf"}],"day":"30","author":[{"last_name":"Jeschke","first_name":"Stefan","full_name":"Jeschke, Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Tomas","last_name":"Skrivan","id":"486A5A46-F248-11E8-B48F-1D18A9856A87","full_name":"Skrivan, Tomas"},{"first_name":"Matthias","last_name":"Mueller Fischer","full_name":"Mueller Fischer, Matthias"},{"full_name":"Chentanez, Nuttapong","first_name":"Nuttapong","last_name":"Chentanez"},{"first_name":"Miles","last_name":"Macklin","full_name":"Macklin, Miles"},{"last_name":"Wojtan","first_name":"Christopher J","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"publist_id":"7789","article_number":"94","title":"Water surface wavelets","department":[{"_id":"ChWo"}],"publisher":"ACM","user_id":"2EBD1598-F248-11E8-B48F-1D18A9856A87","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode","image":"/images/cc_by_nc_sa.png","name":"Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)","short":"CC BY-NC-SA (4.0)"},"scopus_import":"1","article_processing_charge":"No","ec_funded":1,"publication":"ACM Transactions on Graphics","quality_controlled":"1","doi":"10.1145/3197517.3201336","project":[{"grant_number":"638176","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"},{"call_identifier":"H2020","_id":"2564DBCA-B435-11E9-9278-68D0E5697425","name":"International IST Doctoral Program","grant_number":"665385"}],"issue":"4","language":[{"iso":"eng"}],"isi":1},{"alternative_title":["Eurographics"],"external_id":{"isi":["000434085600016"]},"status":"public","intvolume":"        37","citation":{"ama":"Sato T, Wojtan C, Thuerey N, Igarashi T, Ando R. Extended narrow band FLIP for liquid simulations. <i>Computer Graphics Forum</i>. 2018;37(2):169-177. doi:<a href=\"https://doi.org/10.1111/cgf.13351\">10.1111/cgf.13351</a>","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.","mla":"Sato, Takahiro, et al. “Extended Narrow Band FLIP for Liquid Simulations.” <i>Computer Graphics Forum</i>, vol. 37, no. 2, Wiley, 2018, pp. 169–77, doi:<a href=\"https://doi.org/10.1111/cgf.13351\">10.1111/cgf.13351</a>.","apa":"Sato, T., Wojtan, C., Thuerey, N., Igarashi, T., &#38; Ando, R. (2018). Extended narrow band FLIP for liquid simulations. <i>Computer Graphics Forum</i>. Wiley. <a href=\"https://doi.org/10.1111/cgf.13351\">https://doi.org/10.1111/cgf.13351</a>","ieee":"T. Sato, C. Wojtan, N. Thuerey, T. Igarashi, and R. Ando, “Extended narrow band FLIP for liquid simulations,” <i>Computer Graphics Forum</i>, vol. 37, no. 2. Wiley, pp. 169–177, 2018.","chicago":"Sato, Takahiro, Chris Wojtan, Nils Thuerey, Takeo Igarashi, and Ryoichi Ando. “Extended Narrow Band FLIP for Liquid Simulations.” <i>Computer Graphics Forum</i>. Wiley, 2018. <a href=\"https://doi.org/10.1111/cgf.13351\">https://doi.org/10.1111/cgf.13351</a>.","short":"T. Sato, C. Wojtan, N. Thuerey, T. Igarashi, R. Ando, Computer Graphics Forum 37 (2018) 169–177."},"oa":1,"publication_status":"published","has_accepted_license":"1","date_published":"2018-05-22T00:00:00Z","ddc":["006"],"year":"2018","_id":"135","page":"169 - 177","date_updated":"2023-09-11T14:00:26Z","abstract":[{"text":"The Fluid Implicit Particle method (FLIP) reduces numerical dissipation by combining particles with grids. To improve performance, the subsequent narrow band FLIP method (NB‐FLIP) uses a FLIP‐based fluid simulation only near the liquid surface and a traditional grid‐based fluid simulation away from the surface. This spatially‐limited FLIP simulation significantly reduces the number of particles and alleviates a computational bottleneck. In this paper, we extend the NB‐FLIP idea even further, by allowing a simulation to transition between a FLIP‐like fluid simulation and a grid‐based simulation in arbitrary locations, not just near the surface. This approach leads to even more savings in memory and computation, because we can concentrate the particles only in areas where they are needed. More importantly, this new method allows us to seamlessly transition to smooth implicit surface geometry wherever the particle‐based simulation is unnecessary. Consequently, our method leads to a practical algorithm for avoiding the noisy surface artifacts associated with particle‐based liquid simulations, while simultaneously maintaining the benefits of a FLIP simulation in regions of dynamic motion.","lang":"eng"}],"month":"05","oa_version":"Submitted Version","type":"journal_article","volume":37,"date_created":"2018-12-11T11:44:49Z","file_date_updated":"2020-10-08T08:38:23Z","project":[{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"638176"}],"isi":1,"language":[{"iso":"eng"}],"issue":"2","publication_identifier":{"issn":["0167-7055"]},"doi":"10.1111/cgf.13351","quality_controlled":"1","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","publisher":"Wiley","department":[{"_id":"ChWo"}],"publication":"Computer Graphics Forum","scopus_import":"1","ec_funded":1,"article_processing_charge":"No","article_type":"original","author":[{"full_name":"Sato, Takahiro","last_name":"Sato","first_name":"Takahiro"},{"full_name":"Wojtan, Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546","last_name":"Wojtan","first_name":"Christopher J"},{"first_name":"Nils","last_name":"Thuerey","full_name":"Thuerey, Nils"},{"full_name":"Igarashi, Takeo","last_name":"Igarashi","first_name":"Takeo"},{"last_name":"Ando","first_name":"Ryoichi","full_name":"Ando, Ryoichi"}],"day":"22","file":[{"file_size":54309947,"relation":"main_file","content_type":"application/pdf","creator":"wojtan","file_name":"exnbflip.pdf","success":1,"date_created":"2020-10-08T08:38:23Z","access_level":"open_access","file_id":"8627","date_updated":"2020-10-08T08:38:23Z","checksum":"8edb90da8a72395eb5d970580e0925b6"}],"title":"Extended narrow band FLIP for liquid simulations"},{"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"}],"date_updated":"2024-02-21T13:48:02Z","oa_version":"Published Version","month":"08","type":"dissertation","page":"124","date_created":"2018-12-11T11:48:47Z","file_date_updated":"2020-07-14T12:48:13Z","year":"2017","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","_id":"839","has_accepted_license":"1","oa":1,"publication_status":"published","supervisor":[{"last_name":"Wojtan","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J"}],"date_published":"2017-08-14T00:00:00Z","ddc":["004","005","006","531","621"],"status":"public","alternative_title":["ISTA Thesis"],"citation":{"ama":"Hahn D. Brittle fracture simulation with boundary elements for computer graphics. 2017. doi:<a href=\"https://doi.org/10.15479/AT:ISTA:th_855\">10.15479/AT:ISTA:th_855</a>","apa":"Hahn, D. (2017). <i>Brittle fracture simulation with boundary elements for computer graphics</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/AT:ISTA:th_855\">https://doi.org/10.15479/AT:ISTA:th_855</a>","mla":"Hahn, David. <i>Brittle Fracture Simulation with Boundary Elements for Computer Graphics</i>. Institute of Science and Technology Austria, 2017, doi:<a href=\"https://doi.org/10.15479/AT:ISTA:th_855\">10.15479/AT:ISTA:th_855</a>.","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. <a href=\"https://doi.org/10.15479/AT:ISTA:th_855\">https://doi.org/10.15479/AT:ISTA:th_855</a>.","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."},"related_material":{"record":[{"relation":"part_of_dissertation","id":"1362","status":"public"},{"relation":"part_of_dissertation","status":"public","id":"1633"},{"id":"5568","status":"public","relation":"popular_science"}]},"day":"14","license":"https://creativecommons.org/licenses/by-sa/4.0/","file":[{"file_name":"IST-2017-855-v1+1_thesis_online_pdfA.pdf","relation":"main_file","content_type":"application/pdf","file_size":14596191,"creator":"system","date_updated":"2020-07-14T12:48:13Z","file_id":"5100","checksum":"6c1ae8c90bfaba5e089417fefbc4a272","date_created":"2018-12-12T10:14:46Z","access_level":"open_access"},{"access_level":"closed","date_created":"2019-04-05T08:40:30Z","checksum":"421672f68d563b029869c5cf1713f919","date_updated":"2020-07-14T12:48:13Z","file_id":"6207","creator":"dernst","relation":"source_file","content_type":"application/zip","file_size":15060566,"file_name":"2017_thesis_Hahn_source.zip"}],"author":[{"full_name":"Hahn, David","id":"357A6A66-F248-11E8-B48F-1D18A9856A87","last_name":"Hahn","first_name":"David"}],"publist_id":"6809","degree_awarded":"PhD","title":"Brittle fracture simulation with boundary elements for computer graphics","department":[{"_id":"ChWo"}],"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","publisher":"Institute of Science and Technology Austria","ec_funded":1,"article_processing_charge":"No","tmp":{"name":"Creative Commons Attribution-ShareAlike 4.0 International Public License (CC BY-SA 4.0)","short":"CC BY-SA (4.0)","image":"/images/cc_by_sa.png","legal_code_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode"},"pubrep_id":"855","publication_identifier":{"issn":["2663-337X"]},"doi":"10.15479/AT:ISTA:th_855","project":[{"call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176"}],"language":[{"iso":"eng"}]},{"intvolume":"        36","citation":{"short":"S. Jeschke, C. Wojtan, ACM Transactions on Graphics 36 (2017).","chicago":"Jeschke, Stefan, and Chris Wojtan. “Water Wave Packets.” <i>ACM Transactions on Graphics</i>. ACM, 2017. <a href=\"https://doi.org/10.1145/3072959.3073678\">https://doi.org/10.1145/3072959.3073678</a>.","ieee":"S. Jeschke and C. Wojtan, “Water wave packets,” <i>ACM Transactions on Graphics</i>, vol. 36, no. 4. ACM, 2017.","apa":"Jeschke, S., &#38; Wojtan, C. (2017). Water wave packets. <i>ACM Transactions on Graphics</i>. ACM. <a href=\"https://doi.org/10.1145/3072959.3073678\">https://doi.org/10.1145/3072959.3073678</a>","mla":"Jeschke, Stefan, and Chris Wojtan. “Water Wave Packets.” <i>ACM Transactions on Graphics</i>, vol. 36, no. 4, 103, ACM, 2017, doi:<a href=\"https://doi.org/10.1145/3072959.3073678\">10.1145/3072959.3073678</a>.","ista":"Jeschke S, Wojtan C. 2017. Water wave packets. ACM Transactions on Graphics. 36(4), 103.","ama":"Jeschke S, Wojtan C. 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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."}],"month":"07","oa_version":"Published Version","type":"journal_article","language":[{"iso":"eng"}],"issue":"4","project":[{"grant_number":"638176","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"}],"doi":"10.1145/3072959.3073678","quality_controlled":"1","publication_identifier":{"issn":["07300301"]},"publication":"ACM Transactions on Graphics","scopus_import":1,"ec_funded":1,"article_processing_charge":"Yes (in subscription journal)","article_type":"original","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"ACM","department":[{"_id":"ChWo"}],"title":"Water wave packets","article_number":"103","publist_id":"7350","author":[{"full_name":"Jeschke, Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87","last_name":"Jeschke","first_name":"Stefan"},{"last_name":"Wojtan","first_name":"Christopher J","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J"}],"day":"01","file":[{"access_level":"open_access","date_created":"2020-01-24T09:32:35Z","checksum":"82a3b2bfeee4ddef16ecc21675d1a48a","file_id":"7359","date_updated":"2020-07-14T12:46:34Z","creator":"wojtan","file_size":13131683,"content_type":"application/pdf","relation":"main_file","file_name":"wavepackets_final.pdf"}]},{"year":"2017","department":[{"_id":"ChWo"}],"publisher":"Institute of Science and Technology Austria","datarep_id":"73","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_processing_charge":"No","ec_funded":1,"tmp":{"name":"Creative Commons Attribution-ShareAlike 4.0 International Public License (CC BY-SA 4.0)","short":"CC BY-SA (4.0)","image":"/images/cc_by_sa.png","legal_code_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode"},"_id":"5568","date_updated":"2024-02-21T13:48:02Z","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)"}],"day":"16","file":[{"checksum":"2323a755842a3399cbc47d76545fc9a0","date_updated":"2020-07-14T12:47:04Z","file_id":"5615","access_level":"open_access","date_created":"2018-12-12T13:02:57Z","file_name":"IST-2017-73-v1+1_FractureRB_v1.1_2017_07_20_final_public.zip","creator":"system","relation":"main_file","content_type":"application/zip","file_size":199353471}],"oa_version":"Published Version","month":"08","type":"research_data","author":[{"last_name":"Hahn","first_name":"David","id":"357A6A66-F248-11E8-B48F-1D18A9856A87","full_name":"Hahn, David"}],"file_date_updated":"2020-07-14T12:47:04Z","date_created":"2018-12-12T12:31:35Z","title":"Source codes: Brittle fracture simulation with boundary elements for computer graphics","status":"public","project":[{"call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","grant_number":"638176"}],"citation":{"chicago":"Hahn, David. “Source Codes: Brittle Fracture Simulation with Boundary Elements for Computer Graphics.” Institute of Science and Technology Austria, 2017. <a href=\"https://doi.org/10.15479/AT:ISTA:73\">https://doi.org/10.15479/AT:ISTA:73</a>.","ieee":"D. 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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_updated":"2023-02-21T09:49:49Z","oa_version":"Submitted Version","month":"10","type":"conference","citation":{"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.","mla":"Manteaux, Pierre, et al. “Space-Time Sculpting of Liquid Animation.” <i>Proceedings of the 9th International Conference on Motion in Games </i>, 2994261, ACM, 2016, doi:<a href=\"https://doi.org/10.1145/2994258.2994261\">10.1145/2994258.2994261</a>.","apa":"Manteaux, P., Vimont, U., Wojtan, C., Rohmer, D., &#38; Cani, M. (2016). Space-time sculpting of liquid animation. 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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"}],"date_updated":"2023-02-21T10:36:07Z","_id":"1361","year":"2016","ddc":["000"],"date_published":"2016-07-11T00:00:00Z","has_accepted_license":"1","oa":1,"publication_status":"published","citation":{"ama":"Da F, Hahn D, Batty C, Wojtan C, Grinspun E. Surface only liquids. In: Vol 35. 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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. 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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>"},"author":[{"last_name":"Hahn","first_name":"David","id":"357A6A66-F248-11E8-B48F-1D18A9856A87","full_name":"Hahn, David"},{"full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","first_name":"Christopher J","last_name":"Wojtan"}],"license":"https://creativecommons.org/licenses/by/4.0/","file":[{"file_name":"IST-2016-632-v1+2_a104-hahn.pdf","file_size":12453704,"relation":"main_file","content_type":"application/pdf","creator":"system","file_id":"5121","date_updated":"2020-07-14T12:44:46Z","checksum":"943712d9c9dc8bb5048d4adc561d7d38","date_created":"2018-12-12T10:15:04Z","access_level":"open_access"}],"day":"01","title":"Fast approximations for boundary element based brittle fracture simulation","article_number":"104","publist_id":"5880","publisher":"ACM","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","department":[{"_id":"ChWo"}],"ec_funded":1,"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)"},"pubrep_id":"632","doi":"10.1145/2897824.2925902","quality_controlled":"1","project":[{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","grant_number":"638176"}],"conference":{"end_date":"2016-07-28","start_date":"2016-07-24","location":"Anaheim, CA, USA","name":"ACM SIGGRAPH"},"language":[{"iso":"eng"}],"issue":"4"},{"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)"},"ec_funded":1,"user_id":"4435EBFC-F248-11E8-B48F-1D18A9856A87","publisher":"ACM","department":[{"_id":"ChWo"}],"article_number":"96","title":"Generalized non-reflecting boundaries for fluid re-simulation","publist_id":"5879","author":[{"first_name":"Morten","last_name":"Bojsen-Hansen","full_name":"Bojsen-Hansen, Morten","orcid":"0000-0002-4417-3224","id":"439F0C8C-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Wojtan","first_name":"Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J"}],"day":"11","file":[{"file_name":"IST-2016-631-v1+2_a96-bojsen-hansen.pdf","creator":"system","file_size":12422760,"relation":"main_file","content_type":"application/pdf","checksum":"140b5532f0a2a006a0149cab7c73c17c","file_id":"4981","date_updated":"2020-07-14T12:44:47Z","access_level":"open_access","date_created":"2018-12-12T10:13:00Z"}],"conference":{"name":"ACM SIGGRAPH","location":"Anaheim, CA, USA","start_date":"2016-07-24","end_date":"2016-07-28"},"issue":"4","language":[{"iso":"eng"}],"project":[{"grant_number":"638176","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"}],"doi":"10.1145/2897824.2925963","quality_controlled":"1","pubrep_id":"631","_id":"1363","acknowledgement":"We thank the IST Austria Visual Computing group for helpful feedback throughout the project. ","year":"2016","volume":35,"file_date_updated":"2020-07-14T12:44:47Z","date_created":"2018-12-11T11:51:35Z","type":"conference","oa_version":"Published Version","month":"07","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"}],"date_updated":"2023-02-21T10:36:12Z","intvolume":"        35","citation":{"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>","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. <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>.","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>","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>.","short":"M. Bojsen-Hansen, C. Wojtan, in:, ACM, 2016."},"alternative_title":["ACM Transactions on Graphics"],"status":"public","ddc":["000"],"date_published":"2016-07-11T00:00:00Z","acknowledged_ssus":[{"_id":"ScienComp"}],"oa":1,"publication_status":"published","has_accepted_license":"1"},{"acknowledgement":"This research was supported by NSERC (RGPIN-04360-2014) and IST Austria. ","year":"2016","_id":"1412","page":"233 - 242","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"}],"date_updated":"2023-02-21T10:38:30Z","type":"journal_article","oa_version":"Submitted Version","month":"05","volume":35,"file_date_updated":"2020-07-14T12:44:53Z","date_created":"2018-12-11T11:51:52Z","status":"public","intvolume":"        35","citation":{"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>.","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.","short":"R. Goldade, C. Batty, C. Wojtan, Computer Graphics Forum 35 (2016) 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>","ista":"Goldade R, Batty C, Wojtan C. 2016. A practical method for high-resolution embedded liquid surfaces. Computer Graphics Forum. 35(2), 233–242.","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>."},"publication_status":"published","oa":1,"has_accepted_license":"1","ddc":["000"],"date_published":"2016-05-27T00:00:00Z","publisher":"Wiley-Blackwell","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","department":[{"_id":"ChWo"}],"publication":"Computer Graphics Forum","ec_funded":1,"scopus_import":1,"author":[{"first_name":"Ryan","last_name":"Goldade","full_name":"Goldade, Ryan"},{"first_name":"Christopher","last_name":"Batty","full_name":"Batty, Christopher"},{"last_name":"Wojtan","first_name":"Christopher J","full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"file":[{"creator":"system","relation":"main_file","content_type":"application/pdf","file_size":15873858,"file_name":"IST-2016-612-v1+2_Wojtan_APracticalMethod_PostPrint_2016.pdf","access_level":"open_access","date_created":"2018-12-12T10:13:18Z","checksum":"8e61387ee2e3bd0e776fbe301629bfd9","date_updated":"2020-07-14T12:44:53Z","file_id":"5000"}],"day":"27","title":"A practical method for high-resolution embedded liquid surfaces","publist_id":"5795","project":[{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020","_id":"2533E772-B435-11E9-9278-68D0E5697425","grant_number":"638176"}],"language":[{"iso":"eng"}],"issue":"2","pubrep_id":"612","doi":"10.1111/cgf.12826","quality_controlled":"1"}]