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We depart from earlier work on soap bubbles and foams by noting that their dynamics are naturally described by a Lagrangian vortex sheet model in which circulation is the primary variable. This leads us to derive a novel circulation-preserving surface-only discretization of foam dynamics driven by surface tension on a non-manifold triangle mesh. We represent the surface using a mesh-based multimaterial surface tracker which supports complex bubble topology changes, and evolve the surface according to the ambient air flow induced by a scalar circulation field stored on the mesh. Surface tension forces give rise to a simple update rule for circulation, even at non-manifold Plateau borders, based on a discrete measure of signed scalar mean curvature. We further incorporate vertex constraints to enable the interaction of soap films with wires. The result is a method that is at once simple, robust, and efficient, yet able to capture an array of soap films behaviors including foam rearrangement, catenoid collapse, blowing bubbles, and double bubbles being pulled apart.","lang":"eng"}],"type":"conference","pubrep_id":"608","oa_version":"Submitted Version","file":[{"checksum":"57b07d78d2d612a8052744b37d4a71fa","date_created":"2018-12-12T10:11:14Z","date_updated":"2020-07-14T12:45:07Z","file_id":"4867","relation":"main_file","creator":"system","file_size":8973215,"content_type":"application/pdf","access_level":"open_access","file_name":"IST-2016-608-v1+1_doublebubbles.pdf"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","_id":"1634","intvolume":" 34","ddc":["000"],"status":"public","title":"Double bubbles sans toil and trouble: discrete circulation-preserving vortex sheets for soap films and foams","has_accepted_license":"1","day":"27","scopus_import":1,"date_published":"2015-07-27T00:00:00Z","citation":{"ista":"Da F, Batty C, Wojtan C, Grinspun E. 2015. 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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."}],"alternative_title":["ACM Transactions on Graphics"],"type":"conference","oa_version":"Submitted Version","file":[{"date_created":"2018-12-12T10:11:52Z","date_updated":"2020-07-14T12:45:07Z","checksum":"7a9afdfaba9209157ce19376e15bc90b","relation":"main_file","file_id":"4909","file_size":21831121,"content_type":"application/pdf","creator":"system","file_name":"IST-2016-610-v1+1_vecpotential.pdf","access_level":"open_access"}],"pubrep_id":"610","intvolume":" 34","status":"public","title":"A stream function solver for liquid simulations","ddc":["000"],"_id":"1632","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","has_accepted_license":"1","day":"27","scopus_import":1,"date_published":"2015-07-27T00:00:00Z","citation":{"chicago":"Ando, Ryoichi, Nils Thuerey, and Chris Wojtan. “A Stream Function Solver for Liquid Simulations,” Vol. 34. ACM, 2015. https://doi.org/10.1145/2766935.","short":"R. Ando, N. Thuerey, C. Wojtan, in:, ACM, 2015.","mla":"Ando, Ryoichi, et al. A Stream Function Solver for Liquid Simulations. Vol. 34, no. 4, 53, ACM, 2015, doi:10.1145/2766935.","ieee":"R. Ando, N. Thuerey, and C. Wojtan, “A stream function solver for liquid simulations,” presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Los Angeles, CA, USA, 2015, vol. 34, no. 4.","apa":"Ando, R., Thuerey, N., & Wojtan, C. (2015). A stream function solver for liquid simulations (Vol. 34). Presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Los Angeles, CA, USA: ACM. https://doi.org/10.1145/2766935","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.","ama":"Ando R, Thuerey N, Wojtan C. 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This work was also supported by the ERC projects ERC-2014-StG-637014 realFlow and ERC-2014- StG-638176 BigSplash.","month":"07","language":[{"iso":"eng"}],"doi":"10.1145/2766935","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"},"quality_controlled":"1","oa":1},{"scopus_import":1,"day":"27","has_accepted_license":"1","citation":{"mla":"Guerrero, Paul, et al. Learning Shape Placements by Example. Vol. 34, no. 4, 108, ACM, 2015, doi:10.1145/2766933.","short":"P. Guerrero, S. Jeschke, M. Wimmer, P. Wonka, in:, ACM, 2015.","chicago":"Guerrero, Paul, Stefan Jeschke, Michael Wimmer, and Peter Wonka. “Learning Shape Placements by Example,” Vol. 34. ACM, 2015. https://doi.org/10.1145/2766933.","ama":"Guerrero P, Jeschke S, Wimmer M, Wonka P. Learning shape placements by example. In: Vol 34. 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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.","lang":"eng"}],"issue":"4","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","_id":"1630","title":"Learning shape placements by example","ddc":["000"],"status":"public","intvolume":" 34","pubrep_id":"576","oa_version":"Submitted Version","file":[{"file_id":"4647","relation":"main_file","date_created":"2018-12-12T10:07:49Z","date_updated":"2020-07-14T12:45:07Z","checksum":"8b05a51e372c9b0b5af9a00098a9538b","file_name":"IST-2016-576-v1+1_guerrero-2015-lsp-paper.pdf","access_level":"open_access","creator":"system","file_size":11902290,"content_type":"application/pdf"}],"month":"07","oa":1,"quality_controlled":"1","project":[{"name":"Deep Pictures: Creating Visual and Haptic Vector Images","call_identifier":"FWF","_id":"25357BD2-B435-11E9-9278-68D0E5697425","grant_number":"P 24352-N23"}],"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"},"doi":"10.1145/2766933","language":[{"iso":"eng"}],"article_number":"108","file_date_updated":"2020-07-14T12:45:07Z","publist_id":"5525","year":"2015","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).","publication_status":"published","publisher":"ACM","department":[{"_id":"ChWo"}],"author":[{"full_name":"Guerrero, Paul","first_name":"Paul","last_name":"Guerrero"},{"id":"44D6411A-F248-11E8-B48F-1D18A9856A87","last_name":"Jeschke","first_name":"Stefan","full_name":"Jeschke, Stefan"},{"first_name":"Michael","last_name":"Wimmer","full_name":"Wimmer, Michael"},{"last_name":"Wonka","first_name":"Peter","full_name":"Wonka, Peter"}],"date_updated":"2021-01-12T06:52:07Z","date_created":"2018-12-11T11:53:08Z","volume":34},{"type":"journal_article","issue":"2","abstract":[{"text":"This work presents a method for efficiently simplifying the pressure projection step in a liquid simulation. We first devise a straightforward dimension reduction technique that dramatically reduces the cost of solving the pressure projection. Next, we introduce a novel change of basis that satisfies free-surface boundary conditions exactly, regardless of the accuracy of the pressure solve. When combined, these ideas greatly reduce the computational complexity of the pressure solve without compromising free surface boundary conditions at the highest level of detail. Our techniques are easy to parallelize, and they effectively eliminate the computational bottleneck for large liquid simulations.","lang":"eng"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","_id":"1735","intvolume":" 34","title":"A dimension-reduced pressure solver for liquid simulations","ddc":["000"],"status":"public","pubrep_id":"607","oa_version":"Submitted Version","file":[{"creator":"system","file_size":6312352,"content_type":"application/pdf","access_level":"open_access","file_name":"IST-2016-607-v1+1_coarsegrid.pdf","checksum":"590752bf977855b337a80f78a9bc2404","date_created":"2018-12-12T10:16:30Z","date_updated":"2020-07-14T12:45:15Z","file_id":"5218","relation":"main_file"}],"scopus_import":1,"has_accepted_license":"1","day":"01","citation":{"short":"R. Ando, N. Thürey, C. 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Jeschke, C. Wojtan, ACM Transactions on Graphics 34 (2015).","chicago":"Jeschke, Stefan, and Chris Wojtan. “Water Wave Animation via Wavefront Parameter Interpolation.” ACM Transactions on Graphics. ACM, 2015. https://doi.org/10.1145/2714572.","ama":"Jeschke S, Wojtan C. Water wave animation via wavefront parameter interpolation. ACM Transactions on Graphics. 2015;34(3). doi:10.1145/2714572","ista":"Jeschke S, Wojtan C. 2015. Water wave animation via wavefront parameter interpolation. ACM Transactions on Graphics. 34(3), 27.","apa":"Jeschke, S., & Wojtan, C. (2015). Water wave animation via wavefront parameter interpolation. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/2714572","ieee":"S. Jeschke and C. Wojtan, “Water wave animation via wavefront parameter interpolation,” ACM Transactions on Graphics, vol. 34, no. 3. ACM, 2015."},"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"}],"issue":"3","type":"journal_article","pubrep_id":"575","file":[{"date_created":"2018-12-12T10:12:15Z","date_updated":"2020-07-14T12:45:17Z","checksum":"67c9f4fa370def68cdf31299e48bc91f","file_id":"4933","relation":"main_file","creator":"system","file_size":23712153,"content_type":"application/pdf","file_name":"IST-2016-575-v1+1_wavefront_preprint.pdf","access_level":"open_access"}],"oa_version":"Submitted Version","_id":"1814","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","ddc":["000"],"title":"Water wave animation via wavefront parameter interpolation","status":"public","intvolume":" 34","month":"04","doi":"10.1145/2714572","language":[{"iso":"eng"}],"oa":1,"quality_controlled":"1","project":[{"_id":"25357BD2-B435-11E9-9278-68D0E5697425","grant_number":"P 24352-N23","name":"Deep Pictures: Creating Visual and Haptic Vector Images","call_identifier":"FWF"},{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020","grant_number":"638176","_id":"2533E772-B435-11E9-9278-68D0E5697425"}],"file_date_updated":"2020-07-14T12:45:17Z","ec_funded":1,"publist_id":"5292","article_number":"27","author":[{"full_name":"Jeschke, Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87","last_name":"Jeschke","first_name":"Stefan"},{"full_name":"Wojtan, Christopher J","last_name":"Wojtan","first_name":"Christopher J","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87"}],"date_created":"2018-12-11T11:54:09Z","date_updated":"2023-02-23T10:15:40Z","volume":34,"year":"2015","publication_status":"published","publisher":"ACM","department":[{"_id":"ChWo"}]},{"article_number":"151","file_date_updated":"2020-07-14T12:45:07Z","publist_id":"5522","ec_funded":1,"publication_status":"published","department":[{"_id":"ChWo"}],"publisher":"ACM","year":"2015","date_updated":"2023-09-07T12:02:56Z","date_created":"2018-12-11T11:53:09Z","volume":34,"author":[{"id":"357A6A66-F248-11E8-B48F-1D18A9856A87","first_name":"David","last_name":"Hahn","full_name":"Hahn, David"},{"id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546","first_name":"Christopher J","last_name":"Wojtan","full_name":"Wojtan, Christopher J"}],"related_material":{"record":[{"id":"839","relation":"dissertation_contains","status":"public"}]},"month":"07","quality_controlled":"1","project":[{"name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales","call_identifier":"H2020","grant_number":"638176","_id":"2533E772-B435-11E9-9278-68D0E5697425"}],"oa":1,"language":[{"iso":"eng"}],"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"},"doi":"10.1145/2766896","type":"conference","abstract":[{"text":"We present a method for simulating brittle fracture under the assumptions of quasi-static linear elastic fracture mechanics (LEFM). Using the boundary element method (BEM) and Lagrangian crack-fronts, we produce highly detailed fracture surfaces. The computational cost of the BEM is alleviated by using a low-resolution mesh and interpolating the resulting stress intensity factors when propagating the high-resolution crack-front.\r\n\r\nOur system produces physics-based fracture surfaces with high spatial and temporal resolution, taking spatial variation of material toughness and/or strength into account. It also allows for crack initiation to be handled separately from crack propagation, which is not only more reasonable from a physics perspective, but can also be used to control the simulation.\r\n\r\nSeparating the resolution of the crack-front from the resolution of the computational mesh increases the efficiency and therefore the amount of visual detail on the resulting fracture surfaces. The BEM also allows us to re-use previously computed blocks of the system matrix.","lang":"eng"}],"issue":"4","ddc":["000"],"title":"High-resolution brittle fracture simulation with boundary elements","status":"public","intvolume":" 34","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","_id":"1633","oa_version":"Submitted Version","file":[{"relation":"main_file","file_id":"5131","checksum":"955aee971983f6b6152bcc1c9b4a7c20","date_updated":"2020-07-14T12:45:07Z","date_created":"2018-12-12T10:15:13Z","access_level":"open_access","file_name":"IST-2016-609-v1+1_FractureBEM.pdf","file_size":20154270,"content_type":"application/pdf","creator":"system"}],"pubrep_id":"609","scopus_import":1,"day":"27","has_accepted_license":"1","citation":{"ista":"Hahn D, Wojtan C. 2015. High-resolution brittle fracture simulation with boundary elements. SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques vol. 34, 151.","apa":"Hahn, D., & Wojtan, C. (2015). High-resolution brittle fracture simulation with boundary elements (Vol. 34). Presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Los Angeles, CA, United States: ACM. https://doi.org/10.1145/2766896","ieee":"D. Hahn and C. Wojtan, “High-resolution brittle fracture simulation with boundary elements,” presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Los Angeles, CA, United States, 2015, vol. 34, no. 4.","ama":"Hahn D, Wojtan C. High-resolution brittle fracture simulation with boundary elements. In: Vol 34. ACM; 2015. doi:10.1145/2766896","chicago":"Hahn, David, and Chris Wojtan. “High-Resolution Brittle Fracture Simulation with Boundary Elements,” Vol. 34. ACM, 2015. https://doi.org/10.1145/2766896.","mla":"Hahn, David, and Chris Wojtan. High-Resolution Brittle Fracture Simulation with Boundary Elements. Vol. 34, no. 4, 151, ACM, 2015, doi:10.1145/2766896.","short":"D. Hahn, C. Wojtan, in:, ACM, 2015."},"date_published":"2015-07-27T00:00:00Z"},{"pubrep_id":"577","oa_version":"Submitted Version","file":[{"file_name":"IST-2016-577-v1+1_2014.TOG.Paul.EditingPropagation.final.pdf","access_level":"open_access","content_type":"application/pdf","file_size":9832561,"creator":"system","relation":"main_file","file_id":"4876","date_created":"2018-12-12T10:11:22Z","date_updated":"2020-07-14T12:45:07Z","checksum":"7f91e588a4e888610313b98271e6418e"}],"_id":"1629","user_id":"4435EBFC-F248-11E8-B48F-1D18A9856A87","title":"Edit propagation using geometric relationship functions","status":"public","ddc":["000"],"intvolume":" 33","abstract":[{"lang":"eng","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."}],"issue":"2","type":"journal_article","date_published":"2014-03-01T00:00:00Z","publication":"ACM Transactions on Graphics","citation":{"mla":"Guerrero, Paul, et al. “Edit Propagation Using Geometric Relationship Functions.” ACM Transactions on Graphics, vol. 33, no. 2, 15, ACM, 2014, doi:10.1145/2591010.","short":"P. Guerrero, S. Jeschke, M. Wimmer, P. Wonka, ACM Transactions on Graphics 33 (2014).","chicago":"Guerrero, Paul, Stefan Jeschke, Michael Wimmer, and Peter Wonka. “Edit Propagation Using Geometric Relationship Functions.” ACM Transactions on Graphics. ACM, 2014. https://doi.org/10.1145/2591010.","ama":"Guerrero P, Jeschke S, Wimmer M, Wonka P. Edit propagation using geometric relationship functions. ACM Transactions on Graphics. 2014;33(2). doi:10.1145/2591010","ista":"Guerrero P, Jeschke S, Wimmer M, Wonka P. 2014. Edit propagation using geometric relationship functions. ACM Transactions on Graphics. 33(2), 15.","apa":"Guerrero, P., Jeschke, S., Wimmer, M., & Wonka, P. (2014). Edit propagation using geometric relationship functions. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/2591010","ieee":"P. Guerrero, S. Jeschke, M. Wimmer, and P. Wonka, “Edit propagation using geometric relationship functions,” ACM Transactions on Graphics, vol. 33, no. 2. ACM, 2014."},"day":"01","has_accepted_license":"1","author":[{"first_name":"Paul","last_name":"Guerrero","full_name":"Guerrero, Paul"},{"full_name":"Jeschke, Stefan","last_name":"Jeschke","first_name":"Stefan","id":"44D6411A-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Wimmer","first_name":"Michael","full_name":"Wimmer, Michael"},{"first_name":"Peter","last_name":"Wonka","full_name":"Wonka, Peter"}],"date_updated":"2021-01-12T06:52:06Z","date_created":"2018-12-11T11:53:08Z","volume":33,"year":"2014","publication_status":"published","publisher":"ACM","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:45:07Z","publist_id":"5526","article_number":"15","doi":"10.1145/2591010","language":[{"iso":"eng"}],"oa":1,"quality_controlled":"1","month":"03"},{"month":"11","oa":1,"quality_controlled":"1","doi":"10.1111/cgf.12509","language":[{"iso":"eng"}],"publist_id":"5246","file_date_updated":"2020-07-14T12:45:19Z","year":"2014","publisher":"Wiley","department":[{"_id":"ChWo"}],"publication_status":"published","author":[{"full_name":"Guerrero, Paul","last_name":"Guerrero","first_name":"Paul"},{"full_name":"Auzinger, Thomas","first_name":"Thomas","last_name":"Auzinger","id":"4718F954-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-1546-3265"},{"full_name":"Wimmer, Michael","first_name":"Michael","last_name":"Wimmer"},{"full_name":"Jeschke, Stefan","first_name":"Stefan","last_name":"Jeschke","id":"44D6411A-F248-11E8-B48F-1D18A9856A87"}],"volume":34,"date_created":"2018-12-11T11:54:22Z","date_updated":"2021-01-12T06:53:38Z","scopus_import":1,"has_accepted_license":"1","day":"05","citation":{"ista":"Guerrero P, Auzinger T, Wimmer M, Jeschke S. 2014. Partial shape matching using transformation parameter similarity. Computer Graphics Forum. 34(1), 239–252.","apa":"Guerrero, P., Auzinger, T., Wimmer, M., & Jeschke, S. (2014). Partial shape matching using transformation parameter similarity. Computer Graphics Forum. Wiley. https://doi.org/10.1111/cgf.12509","ieee":"P. Guerrero, T. Auzinger, M. Wimmer, and S. Jeschke, “Partial shape matching using transformation parameter similarity,” Computer Graphics Forum, vol. 34, no. 1. Wiley, pp. 239–252, 2014.","ama":"Guerrero P, Auzinger T, Wimmer M, Jeschke S. Partial shape matching using transformation parameter similarity. Computer Graphics Forum. 2014;34(1):239-252. doi:10.1111/cgf.12509","chicago":"Guerrero, Paul, Thomas Auzinger, Michael Wimmer, and Stefan Jeschke. “Partial Shape Matching Using Transformation Parameter Similarity.” Computer Graphics Forum. Wiley, 2014. https://doi.org/10.1111/cgf.12509.","mla":"Guerrero, Paul, et al. “Partial Shape Matching Using Transformation Parameter Similarity.” Computer Graphics Forum, vol. 34, no. 1, Wiley, 2014, pp. 239–52, doi:10.1111/cgf.12509.","short":"P. Guerrero, T. Auzinger, M. Wimmer, S. Jeschke, Computer Graphics Forum 34 (2014) 239–252."},"publication":"Computer Graphics Forum","page":"239 - 252","date_published":"2014-11-05T00:00:00Z","type":"journal_article","issue":"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"}],"_id":"1854","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","intvolume":" 34","title":"Partial shape matching using transformation parameter similarity","status":"public","ddc":["000"],"pubrep_id":"574","file":[{"file_size":24817484,"content_type":"application/pdf","creator":"system","file_name":"IST-2016-574-v1+1_Guerrero-2014-TPS-paper.pdf","access_level":"open_access","date_updated":"2020-07-14T12:45:19Z","date_created":"2018-12-12T10:15:58Z","checksum":"91946bfc509c77f5fd3151a3ff2b2c8f","relation":"main_file","file_id":"5182"}],"oa_version":"Submitted Version"},{"page":"1280 - 1292","citation":{"chicago":"Arikan, Murat, Reinhold Preiner, Claus Scheiblauer, Stefan Jeschke, and Michael Wimmer. “Large-Scale Point-Cloud Visualization through Localized Textured Surface Reconstruction.” IEEE Transactions on Visualization and Computer Graphics. IEEE, 2014. https://doi.org/10.1109/TVCG.2014.2312011.","short":"M. Arikan, R. Preiner, C. Scheiblauer, S. Jeschke, M. Wimmer, IEEE Transactions on Visualization and Computer Graphics 20 (2014) 1280–1292.","mla":"Arikan, Murat, et al. “Large-Scale Point-Cloud Visualization through Localized Textured Surface Reconstruction.” IEEE Transactions on Visualization and Computer Graphics, vol. 20, no. 9, IEEE, 2014, pp. 1280–92, doi:10.1109/TVCG.2014.2312011.","ieee":"M. Arikan, R. Preiner, C. Scheiblauer, S. Jeschke, and M. Wimmer, “Large-scale point-cloud visualization through localized textured surface reconstruction,” IEEE Transactions on Visualization and Computer Graphics, vol. 20, no. 9. IEEE, pp. 1280–1292, 2014.","apa":"Arikan, M., Preiner, R., Scheiblauer, C., Jeschke, S., & Wimmer, M. (2014). Large-scale point-cloud visualization through localized textured surface reconstruction. IEEE Transactions on Visualization and Computer Graphics. IEEE. https://doi.org/10.1109/TVCG.2014.2312011","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. IEEE Transactions on Visualization and Computer Graphics. 2014;20(9):1280-1292. doi:10.1109/TVCG.2014.2312011"},"publication":"IEEE Transactions on Visualization and Computer Graphics","date_published":"2014-09-09T00:00:00Z","scopus_import":1,"has_accepted_license":"1","day":"09","intvolume":" 20","status":"public","ddc":["000"],"title":"Large-scale point-cloud visualization through localized textured surface reconstruction","user_id":"4435EBFC-F248-11E8-B48F-1D18A9856A87","_id":"1906","oa_version":"Submitted Version","file":[{"checksum":"5bf58942d2eb20adf03c7f9ea2e68124","date_created":"2018-12-12T10:17:41Z","date_updated":"2020-07-14T12:45:20Z","file_id":"5297","relation":"main_file","creator":"system","content_type":"application/pdf","file_size":13594598,"access_level":"open_access","file_name":"IST-2016-573-v1+1_arikan-2014-pcvis-draft.pdf"}],"pubrep_id":"573","type":"journal_article","issue":"9","abstract":[{"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.","lang":"eng"}],"project":[{"_id":"25357BD2-B435-11E9-9278-68D0E5697425","grant_number":"P 24352-N23","name":"Deep Pictures: Creating Visual and Haptic Vector Images","call_identifier":"FWF"}],"oa":1,"language":[{"iso":"eng"}],"doi":"10.1109/TVCG.2014.2312011","month":"09","publisher":"IEEE","department":[{"_id":"ChWo"}],"publication_status":"published","year":"2014","acknowledgement":"This research was supported by the Austrian Research Promotion Agency (FFG) project REPLICATE (no. 835948), the EU FP7 project HARVEST4D (no. 323567).","volume":20,"date_created":"2018-12-11T11:54:39Z","date_updated":"2021-01-12T06:53:59Z","author":[{"last_name":"Arikan","first_name":"Murat","full_name":"Arikan, Murat"},{"first_name":"Reinhold","last_name":"Preiner","full_name":"Preiner, Reinhold"},{"full_name":"Scheiblauer, Claus","last_name":"Scheiblauer","first_name":"Claus"},{"full_name":"Jeschke, Stefan","first_name":"Stefan","last_name":"Jeschke","id":"44D6411A-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Wimmer","first_name":"Michael","full_name":"Wimmer, Michael"}],"publist_id":"5189","file_date_updated":"2020-07-14T12:45:20Z"},{"month":"07","doi":"10.1145/2601097.2601126","conference":{"name":"SIGGRAPH: International Conference and Exhibition on Computer Graphics and Interactive Techniques","end_date":"2014-08-14","location":"Vancouver, Canada","start_date":"2014-08-10"},"language":[{"iso":"eng"}],"oa":1,"project":[{"_id":"25636330-B435-11E9-9278-68D0E5697425","grant_number":"11-NSF-1070","name":"ROOTS Genome-wide Analysis of Root Traits"}],"quality_controlled":"1","publist_id":"4988","file_date_updated":"2020-07-14T12:45:27Z","article_number":"137","author":[{"full_name":"Raveendran, Karthik","first_name":"Karthik","last_name":"Raveendran"},{"full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","last_name":"Wojtan","first_name":"Christopher J"},{"full_name":"Thuerey, Nils","last_name":"Thuerey","first_name":"Nils"},{"full_name":"Türk, Greg","last_name":"Türk","first_name":"Greg"}],"volume":33,"date_created":"2018-12-11T11:55:28Z","date_updated":"2022-08-25T14:02:46Z","year":"2014","department":[{"_id":"ChWo"}],"publisher":"ACM","publication_status":"published","has_accepted_license":"1","article_processing_charge":"No","day":"01","scopus_import":"1","date_published":"2014-07-01T00:00:00Z","citation":{"chicago":"Raveendran, Karthik, Chris Wojtan, Nils Thuerey, and Greg Türk. “Blending Liquids.” In ACM Transactions on Graphics, Vol. 33. ACM, 2014. https://doi.org/10.1145/2601097.2601126.","mla":"Raveendran, Karthik, et al. “Blending Liquids.” ACM Transactions on Graphics, vol. 33, no. 4, 137, ACM, 2014, doi:10.1145/2601097.2601126.","short":"K. Raveendran, C. Wojtan, N. Thuerey, G. Türk, in:, ACM Transactions on Graphics, ACM, 2014.","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.","apa":"Raveendran, K., Wojtan, C., Thuerey, N., & Türk, G. (2014). Blending liquids. In ACM Transactions on Graphics (Vol. 33). Vancouver, Canada: ACM. https://doi.org/10.1145/2601097.2601126","ieee":"K. Raveendran, C. Wojtan, N. Thuerey, and G. Türk, “Blending liquids,” in ACM Transactions on Graphics, Vancouver, Canada, 2014, vol. 33, no. 4.","ama":"Raveendran K, Wojtan C, Thuerey N, Türk G. Blending liquids. In: ACM Transactions on Graphics. Vol 33. ACM; 2014. doi:10.1145/2601097.2601126"},"publication":"ACM Transactions on Graphics","issue":"4","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."}],"type":"conference","pubrep_id":"606","file":[{"relation":"main_file","file_id":"4688","checksum":"1752760a2e71e254537f31c0d10d9c6c","date_created":"2018-12-12T10:08:27Z","date_updated":"2020-07-14T12:45:27Z","access_level":"open_access","file_name":"IST-2016-606-v1+1_BlendingLiquids-Preprint.pdf","content_type":"application/pdf","file_size":8387384,"creator":"system"}],"oa_version":"Submitted Version","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","_id":"2058","intvolume":" 33","status":"public","title":"Blending liquids","ddc":["000"]},{"publist_id":"4436","file_date_updated":"2020-07-14T12:45:41Z","article_number":"103","volume":32,"date_created":"2018-12-11T11:57:50Z","date_updated":"2023-02-23T10:44:14Z","author":[{"full_name":"Ando, Ryoichi","last_name":"Ando","first_name":"Ryoichi"},{"full_name":"Thuerey, Nils","first_name":"Nils","last_name":"Thuerey"},{"full_name":"Wojtan, Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546","first_name":"Christopher J","last_name":"Wojtan"}],"publisher":"ACM","department":[{"_id":"ChWo"}],"publication_status":"published","year":"2013","month":"07","language":[{"iso":"eng"}],"doi":"10.1145/2461912.2461982","quality_controlled":"1","oa":1,"issue":"4","abstract":[{"text":"We introduce a new method for efficiently simulating liquid with extreme amounts of spatial adaptivity. Our method combines several key components to drastically speed up the simulation of large-scale fluid phenomena: We leverage an alternative Eulerian tetrahedral mesh discretization to significantly reduce the complexity of the pressure solve while increasing the robustness with respect to element quality and removing the possibility of locking. Next, we enable subtle free-surface phenomena by deriving novel second-order boundary conditions consistent with our discretization. We couple this discretization with a spatially adaptive Fluid-Implicit Particle (FLIP) method, enabling efficient, robust, minimally-dissipative simulations that can undergo sharp changes in spatial resolution while minimizing artifacts. Along the way, we provide a new method for generating a smooth and detailed surface from a set of particles with variable sizes. Finally, we explore several new sizing functions for determining spatially adaptive simulation resolutions, and we show how to couple them to our simulator. We combine each of these elements to produce a simulation algorithm that is capable of creating animations at high maximum resolutions while avoiding common pitfalls like inaccurate boundary conditions and inefficient computation.","lang":"eng"}],"type":"journal_article","file":[{"relation":"main_file","file_id":"5279","checksum":"aeea6b0ff2b27c695aeb8408c7d2fc50","date_updated":"2020-07-14T12:45:41Z","date_created":"2018-12-12T10:17:25Z","access_level":"open_access","file_name":"IST-2016-605-v1+1_tetflip_fixed.pdf","content_type":"application/pdf","file_size":8601561,"creator":"system"}],"oa_version":"Submitted Version","pubrep_id":"605","intvolume":" 32","ddc":["000"],"title":"Highly adaptive liquid simulations on tetrahedral meshes","status":"public","_id":"2466","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","has_accepted_license":"1","day":"01","scopus_import":1,"date_published":"2013-07-01T00:00:00Z","citation":{"ama":"Ando R, Thuerey N, Wojtan C. Highly adaptive liquid simulations on tetrahedral meshes. ACM Transactions on Graphics. 2013;32(4). doi:10.1145/2461912.2461982","ista":"Ando R, Thuerey N, Wojtan C. 2013. Highly adaptive liquid simulations on tetrahedral meshes. ACM Transactions on Graphics. 32(4), 103.","apa":"Ando, R., Thuerey, N., & Wojtan, C. (2013). Highly adaptive liquid simulations on tetrahedral meshes. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/2461912.2461982","ieee":"R. Ando, N. Thuerey, and C. Wojtan, “Highly adaptive liquid simulations on tetrahedral meshes,” ACM Transactions on Graphics, vol. 32, no. 4. ACM, 2013.","mla":"Ando, Ryoichi, et al. “Highly Adaptive Liquid Simulations on Tetrahedral Meshes.” ACM Transactions on Graphics, vol. 32, no. 4, 103, ACM, 2013, doi:10.1145/2461912.2461982.","short":"R. Ando, N. Thuerey, C. Wojtan, ACM Transactions on Graphics 32 (2013).","chicago":"Ando, Ryoichi, Nils Thuerey, and Chris Wojtan. “Highly Adaptive Liquid Simulations on Tetrahedral Meshes.” ACM Transactions on Graphics. ACM, 2013. https://doi.org/10.1145/2461912.2461982."},"publication":"ACM Transactions on Graphics"},{"author":[{"full_name":"Bernstein, Gilbert","first_name":"Gilbert","last_name":"Bernstein"},{"full_name":"Wojtan, Christopher J","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546","first_name":"Christopher J","last_name":"Wojtan"}],"date_created":"2018-12-11T11:57:50Z","date_updated":"2023-02-23T10:44:16Z","volume":32,"year":"2013","publication_status":"published","department":[{"_id":"ChWo"}],"publisher":"ACM","file_date_updated":"2020-07-14T12:45:41Z","publist_id":"4435","article_number":"34","doi":"10.1145/2461912.2462027","language":[{"iso":"eng"}],"oa":1,"quality_controlled":"1","month":"07","pubrep_id":"604","file":[{"file_size":3514674,"content_type":"application/pdf","creator":"system","access_level":"open_access","file_name":"IST-2016-604-v1+1_toptop2013.pdf","checksum":"9c8425d62246996ca632c5a01870515b","date_updated":"2020-07-14T12:45:41Z","date_created":"2018-12-12T10:09:43Z","relation":"main_file","file_id":"4768"}],"oa_version":"Submitted Version","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","_id":"2467","title":"Putting holes in holey geometry: Topology change for arbitrary surfaces","ddc":["000"],"status":"public","intvolume":" 32","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"}],"issue":"4","type":"journal_article","date_published":"2013-07-01T00:00:00Z","publication":"ACM Transactions on Graphics","citation":{"chicago":"Bernstein, Gilbert, and Chris Wojtan. “Putting Holes in Holey Geometry: Topology Change for Arbitrary Surfaces.” ACM Transactions on Graphics. ACM, 2013. https://doi.org/10.1145/2461912.2462027.","short":"G. Bernstein, C. Wojtan, ACM Transactions on Graphics 32 (2013).","mla":"Bernstein, Gilbert, and Chris Wojtan. “Putting Holes in Holey Geometry: Topology Change for Arbitrary Surfaces.” ACM Transactions on Graphics, vol. 32, no. 4, 34, ACM, 2013, doi:10.1145/2461912.2462027.","apa":"Bernstein, G., & Wojtan, C. (2013). Putting holes in holey geometry: Topology change for arbitrary surfaces. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/2461912.2462027","ieee":"G. Bernstein and C. Wojtan, “Putting holes in holey geometry: Topology change for arbitrary surfaces,” ACM Transactions on Graphics, vol. 32, no. 4. ACM, 2013.","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. ACM Transactions on Graphics. 2013;32(4). doi:10.1145/2461912.2462027"},"day":"01","has_accepted_license":"1","scopus_import":1},{"oa":1,"quality_controlled":"1","doi":"10.1145/2461912.2461991","language":[{"iso":"eng"}],"month":"07","year":"2013","publisher":"ACM","department":[{"_id":"ChWo"}],"publication_status":"published","author":[{"full_name":"Bojsen-Hansen, Morten","id":"439F0C8C-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-4417-3224","first_name":"Morten","last_name":"Bojsen-Hansen"},{"first_name":"Christopher J","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J"}],"volume":32,"date_updated":"2023-02-23T10:44:18Z","date_created":"2018-12-11T11:57:50Z","article_number":"68","publist_id":"4434","file_date_updated":"2020-07-14T12:45:41Z","citation":{"mla":"Bojsen-Hansen, Morten, and Chris Wojtan. “Liquid Surface Tracking with Error Compensation.” ACM Transactions on Graphics, vol. 32, no. 4, 68, ACM, 2013, doi:10.1145/2461912.2461991.","short":"M. Bojsen-Hansen, C. Wojtan, ACM Transactions on Graphics 32 (2013).","chicago":"Bojsen-Hansen, Morten, and Chris Wojtan. “Liquid Surface Tracking with Error Compensation.” ACM Transactions on Graphics. ACM, 2013. https://doi.org/10.1145/2461912.2461991.","ama":"Bojsen-Hansen M, Wojtan C. Liquid surface tracking with error compensation. ACM Transactions on Graphics. 2013;32(4). doi:10.1145/2461912.2461991","ista":"Bojsen-Hansen M, Wojtan C. 2013. Liquid surface tracking with error compensation. ACM Transactions on Graphics. 32(4), 68.","apa":"Bojsen-Hansen, M., & Wojtan, C. (2013). Liquid surface tracking with error compensation. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/2461912.2461991","ieee":"M. Bojsen-Hansen and C. Wojtan, “Liquid surface tracking with error compensation,” ACM Transactions on Graphics, vol. 32, no. 4. ACM, 2013."},"publication":"ACM Transactions on Graphics","date_published":"2013-07-01T00:00:00Z","scopus_import":1,"has_accepted_license":"1","day":"01","_id":"2468","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","intvolume":" 32","ddc":["000"],"status":"public","title":"Liquid surface tracking with error compensation","pubrep_id":"603","file":[{"relation":"main_file","file_id":"4761","date_created":"2018-12-12T10:09:37Z","date_updated":"2020-07-14T12:45:41Z","checksum":"53d905e0180e23ef3e813b969ffed4e1","file_name":"IST-2016-603-v1+1_liquidError_web.pdf","access_level":"open_access","file_size":5813685,"content_type":"application/pdf","creator":"system"}],"oa_version":"Submitted Version","type":"journal_article","issue":"4","abstract":[{"lang":"eng","text":"Our work concerns the combination of an Eulerian liquid simulation with a high-resolution surface tracker (e.g. the level set method or a Lagrangian triangle mesh). The naive application of a high-resolution surface tracker to a low-resolution velocity field can produce many visually disturbing physical and topological artifacts that limit their use in practice. We address these problems by defining an error function which compares the current state of the surface tracker to the set of physically valid surface states. By reducing this error with a gradient descent technique, we introduce a novel physics-based surface fairing method. Similarly, by treating this error function as a potential energy, we derive a new surface correction force that mimics the vortex sheet equations. We demonstrate our results with both level set and mesh-based surface trackers."}]},{"date_published":"2012-07-29T00:00:00Z","publication":"Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation","citation":{"ama":"Raveendran K, Thuerey N, Wojtan C, Turk G. Controlling liquids using meshes. In: Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation. ACM; 2012:255-264.","ieee":"K. Raveendran, N. Thuerey, C. Wojtan, and G. Turk, “Controlling liquids using meshes,” in Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation, Aire-la-Ville, Switzerland, 2012, pp. 255–264.","apa":"Raveendran, K., Thuerey, N., Wojtan, C., & Turk, G. (2012). Controlling liquids using meshes. In Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation (pp. 255–264). Aire-la-Ville, Switzerland: ACM.","ista":"Raveendran K, Thuerey N, Wojtan C, Turk G. 2012. Controlling liquids using meshes. Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation. SCA: ACM SIGGRAPH/Eurographics Symposium on Computer animation, 255–264.","short":"K. Raveendran, N. Thuerey, C. Wojtan, G. Turk, in:, Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation, ACM, 2012, pp. 255–264.","mla":"Raveendran, Karthik, et al. “Controlling Liquids Using Meshes.” Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation, ACM, 2012, pp. 255–64.","chicago":"Raveendran, Karthik, Nils Thuerey, Chris Wojtan, and Greg Turk. “Controlling Liquids Using Meshes.” In Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation, 255–64. ACM, 2012."},"page":"255 - 264","day":"29","has_accepted_license":"1","scopus_import":1,"pubrep_id":"600","file":[{"date_updated":"2020-07-14T12:46:00Z","date_created":"2018-12-12T10:11:23Z","checksum":"babda64c24cf90a4d05ae86d712bed08","file_id":"4877","relation":"main_file","creator":"system","content_type":"application/pdf","file_size":4939370,"file_name":"IST-2016-600-v1+1_ControllingLiquids_Preprint.pdf","access_level":"open_access"}],"oa_version":"Submitted Version","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","_id":"3119","status":"public","ddc":["000"],"title":"Controlling liquids using meshes","abstract":[{"lang":"eng","text":"We present an approach for artist-directed animation of liquids using multiple levels of control over the simulation, ranging from the overall tracking of desired shapes to highly detailed secondary effects such as dripping streams, separating sheets of fluid, surface waves and ripples. The first portion of our technique is a volume preserving morph that allows the animator to produce a plausible fluid-like motion from a sparse set of control meshes. By rasterizing the resulting control meshes onto the simulation grid, the mesh velocities act as boundary conditions during the projection step of the fluid simulation. We can then blend this motion together with uncontrolled fluid velocities to achieve a more relaxed control over the fluid that captures natural inertial effects. Our method can produce highly detailed liquid surfaces with control over sub-grid details by using a mesh-based surface tracker on top of a coarse grid-based fluid simulation. We can create ripples and waves on the fluid surface attracting the surface mesh to the control mesh with spring-like forces and also by running a wave simulation over the surface mesh. Our video results demonstrate how our control scheme can be used to create animated characters and shapes that are made of water.\r\n"}],"type":"conference","conference":{"name":"SCA: ACM SIGGRAPH/Eurographics Symposium on Computer animation","end_date":"2012-07-31","start_date":"2012-07-29","location":"Aire-la-Ville, Switzerland"},"language":[{"iso":"eng"}],"oa":1,"quality_controlled":"1","month":"07","author":[{"full_name":"Raveendran, Karthik","first_name":"Karthik","last_name":"Raveendran"},{"full_name":"Thuerey, Nils","last_name":"Thuerey","first_name":"Nils"},{"full_name":"Wojtan, Christopher J","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","last_name":"Wojtan","first_name":"Christopher J"},{"first_name":"Greg","last_name":"Turk","full_name":"Turk, Greg"}],"related_material":{"link":[{"relation":"table_of_contents","url":"http://dl.acm.org/citation.cfm?id=2422393"}]},"date_created":"2018-12-11T12:01:30Z","date_updated":"2023-02-23T11:13:07Z","year":"2012","acknowledgement":"This work was partially funded by NSF grants CCF-0811485 and IIS-1130934. We would like to thank Scanline VFX for additional funding. We would like to thank Jie Tan as well as our anonymous reviewers for their useful suggestions and feedback.","publication_status":"published","publisher":"ACM","department":[{"_id":"ChWo"}],"file_date_updated":"2020-07-14T12:46:00Z","publist_id":"3580"},{"publication":"ACM Transactions on Graphics","citation":{"short":"M. Bojsen-Hansen, H. Li, C. Wojtan, ACM Transactions on Graphics 31 (2012).","mla":"Bojsen-Hansen, Morten, et al. “Tracking Surfaces with Evolving Topology.” ACM Transactions on Graphics, vol. 31, no. 4, 53, ACM, 2012, doi:10.1145/2185520.2185549.","chicago":"Bojsen-Hansen, Morten, Hao Li, and Chris Wojtan. “Tracking Surfaces with Evolving Topology.” ACM Transactions on Graphics. ACM, 2012. https://doi.org/10.1145/2185520.2185549.","ama":"Bojsen-Hansen M, Li H, Wojtan C. Tracking surfaces with evolving topology. ACM Transactions on Graphics. 2012;31(4). doi:10.1145/2185520.2185549","apa":"Bojsen-Hansen, M., Li, H., & Wojtan, C. (2012). Tracking surfaces with evolving topology. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/2185520.2185549","ieee":"M. Bojsen-Hansen, H. Li, and C. Wojtan, “Tracking surfaces with evolving topology,” ACM Transactions on Graphics, vol. 31, no. 4. ACM, 2012.","ista":"Bojsen-Hansen M, Li H, Wojtan C. 2012. Tracking surfaces with evolving topology. ACM Transactions on Graphics. 31(4), 53."},"article_type":"original","date_published":"2012-07-01T00:00:00Z","scopus_import":"1","day":"01","article_processing_charge":"No","has_accepted_license":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","_id":"3118","ddc":["000"],"status":"public","title":"Tracking surfaces with evolving topology","intvolume":" 31","pubrep_id":"602","oa_version":"Submitted Version","file":[{"creator":"system","content_type":"application/pdf","file_size":44538518,"access_level":"open_access","file_name":"IST-2016-602-v1+1_topoReg.pdf","checksum":"1e219c5bf4e5552c1290c62eefa5cd60","date_updated":"2020-07-14T12:46:00Z","date_created":"2018-12-12T10:18:37Z","file_id":"5359","relation":"main_file"}],"type":"journal_article","alternative_title":["SIGGRAPH"],"abstract":[{"lang":"eng","text":"We present a method for recovering a temporally coherent, deforming triangle mesh with arbitrarily changing topology from an incoherent sequence of static closed surfaces. We solve this problem using the surface geometry alone, without any prior information like surface templates or velocity fields. Our system combines a proven strategy for triangle mesh improvement, a robust multi-resolution non-rigid registration routine, and a reliable technique for changing surface mesh topology. We also introduce a novel topological constraint enforcement algorithm to ensure that the output and input always have similar topology. We apply our technique to a series of diverse input data from video reconstructions, physics simulations, and artistic morphs. The structured output of our algorithm allows us to efficiently track information like colors and displacement maps, recover velocity information, and solve PDEs on the mesh as a post process."}],"issue":"4","oa":1,"quality_controlled":"1","doi":"10.1145/2185520.2185549","language":[{"iso":"eng"}],"month":"07","acknowledgement":"This work is supported by the SNF fellowship PBEZP2-134464.\r\nWe would like to thank Xiaochen Hu for implementing mesh con- version tools, Duygu Ceylan for helping with the rendering, and Art Tevs for the human performance data comparison. We also thank Nils Thuerey and Christopher Batty for helpful discussions. ","year":"2012","publication_status":"published","department":[{"_id":"ChWo"}],"publisher":"ACM","author":[{"full_name":"Bojsen-Hansen, Morten","orcid":"0000-0002-4417-3224","id":"439F0C8C-F248-11E8-B48F-1D18A9856A87","last_name":"Bojsen-Hansen","first_name":"Morten"},{"full_name":"Li, Hao","first_name":"Hao","last_name":"Li"},{"first_name":"Christopher J","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J"}],"date_updated":"2022-05-24T08:21:11Z","date_created":"2018-12-11T12:01:29Z","volume":31,"article_number":"53","file_date_updated":"2020-07-14T12:46:00Z","publist_id":"3581"},{"issue":"2","abstract":[{"lang":"eng","text":"We introduce the idea of using an explicit triangle mesh to track the air/fluid interface in a smoothed particle hydrodynamics (SPH) simulator. Once an initial surface mesh is created, this mesh is carried forward in time using nearby particle velocities to advect the mesh vertices. The mesh connectivity remains mostly unchanged across time-steps; it is only modified locally for topology change events or for the improvement of triangle quality. In order to ensure that the surface mesh does not diverge from the underlying particle simulation, we periodically project the mesh surface onto an implicit surface defined by the physics simulation. The mesh surface gives us several advantages over previous SPH surface tracking techniques. We demonstrate a new method for surface tension calculations that clearly outperforms the state of the art in SPH surface tension for computer graphics. We also demonstrate a method for tracking detailed surface information (like colors) that is less susceptible to numerical diffusion than competing techniques. Finally, our temporally-coherent surface mesh allows us to simulate high-resolution surface wave dynamics without being limited by the particle resolution of the SPH simulation."}],"type":"conference","alternative_title":["Eurographics"],"pubrep_id":"601","oa_version":"Submitted Version","file":[{"file_name":"IST-2016-601-v1+1_meshSPH.pdf","access_level":"open_access","creator":"system","file_size":5740527,"content_type":"application/pdf","file_id":"5092","relation":"main_file","date_created":"2018-12-12T10:14:39Z","date_updated":"2020-07-14T12:46:00Z","checksum":"acb325dd1e31859bedd30e013f61d0b9"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","_id":"3123","intvolume":" 31","title":"Explicit mesh surfaces for particle based fluids","ddc":["000"],"status":"public","article_processing_charge":"No","has_accepted_license":"1","day":"01","scopus_import":"1","date_published":"2012-05-01T00:00:00Z","citation":{"ama":"Yu J, Wojtan C, Turk G, Yap C. Explicit mesh surfaces for particle based fluids. In: Computer Graphics Forum. Vol 31. Wiley; 2012:815-824. doi:10.1111/j.1467-8659.2012.03062.x","apa":"Yu, J., Wojtan, C., Turk, G., & Yap, C. (2012). Explicit mesh surfaces for particle based fluids. In Computer Graphics Forum (Vol. 31, pp. 815–824). Cagliari, Sardinia, Italy: Wiley. https://doi.org/10.1111/j.1467-8659.2012.03062.x","ieee":"J. Yu, C. Wojtan, G. Turk, and C. Yap, “Explicit mesh surfaces for particle based fluids,” in Computer Graphics Forum, Cagliari, Sardinia, Italy, 2012, vol. 31, no. 2, pp. 815–824.","ista":"Yu J, Wojtan C, Turk G, Yap C. 2012. Explicit mesh surfaces for particle based fluids. Computer Graphics Forum. EUROGRAPHICS: Conference on European Association for Computer Graphics, Eurographics, vol. 31, 815–824.","short":"J. Yu, C. Wojtan, G. Turk, C. Yap, in:, Computer Graphics Forum, Wiley, 2012, pp. 815–824.","mla":"Yu, Jihun, et al. “Explicit Mesh Surfaces for Particle Based Fluids.” Computer Graphics Forum, vol. 31, no. 2, Wiley, 2012, pp. 815–24, doi:10.1111/j.1467-8659.2012.03062.x.","chicago":"Yu, Jihun, Chris Wojtan, Greg Turk, and Chee Yap. “Explicit Mesh Surfaces for Particle Based Fluids.” In Computer Graphics Forum, 31:815–24. Wiley, 2012. https://doi.org/10.1111/j.1467-8659.2012.03062.x."},"publication":"Computer Graphics Forum","page":"815 - 824","publist_id":"3576","file_date_updated":"2020-07-14T12:46:00Z","author":[{"full_name":"Yu, Jihun","last_name":"Yu","first_name":"Jihun"},{"last_name":"Wojtan","first_name":"Christopher J","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J"},{"last_name":"Turk","first_name":"Greg","full_name":"Turk, Greg"},{"last_name":"Yap","first_name":"Chee","full_name":"Yap, Chee"}],"volume":31,"date_updated":"2023-10-16T09:54:40Z","date_created":"2018-12-11T12:01:31Z","year":"2012","acknowledgement":"This work was funded by NSF grant IIS-1017014 and CCF- 0917093.","publisher":"Wiley","department":[{"_id":"ChWo"}],"publication_status":"published","publication_identifier":{"eissn":["1467-8659"],"issn":["0167-7055"]},"month":"05","doi":"10.1111/j.1467-8659.2012.03062.x","conference":{"start_date":"2012-05-13","location":"Cagliari, Sardinia, Italy","end_date":"2012-05-18","name":"EUROGRAPHICS: Conference on European Association for Computer Graphics"},"language":[{"iso":"eng"}],"oa":1,"quality_controlled":"1"},{"day":"05","has_accepted_license":"1","scopus_import":1,"date_published":"2011-08-05T00:00:00Z","citation":{"chicago":"Raveendran, Karthik, Chris Wojtan, and Greg Turk. “Hybrid Smoothed Particle Hydrodynamics.” edited by Stephen Spencer, 33–42. ACM, 2011. https://doi.org/10.1145/2019406.2019411.","mla":"Raveendran, Karthik, et al. Hybrid Smoothed Particle Hydrodynamics. Edited by Stephen Spencer, ACM, 2011, pp. 33–42, doi:10.1145/2019406.2019411.","short":"K. Raveendran, C. Wojtan, G. Turk, in:, S. Spencer (Ed.), ACM, 2011, pp. 33–42.","ista":"Raveendran K, Wojtan C, Turk G. 2011. Hybrid smoothed particle hydrodynamics. SCA: ACM SIGGRAPH/Eurographics Symposium on Computer animation, 33–42.","apa":"Raveendran, K., Wojtan, C., & Turk, G. (2011). Hybrid smoothed particle hydrodynamics. In S. Spencer (Ed.) (pp. 33–42). Presented at the SCA: ACM SIGGRAPH/Eurographics Symposium on Computer animation, Vancouver, Canada: ACM. https://doi.org/10.1145/2019406.2019411","ieee":"K. Raveendran, C. Wojtan, and G. Turk, “Hybrid smoothed particle hydrodynamics,” presented at the SCA: ACM SIGGRAPH/Eurographics Symposium on Computer animation, Vancouver, Canada, 2011, pp. 33–42.","ama":"Raveendran K, Wojtan C, Turk G. Hybrid smoothed particle hydrodynamics. In: Spencer S, ed. ACM; 2011:33-42. doi:10.1145/2019406.2019411"},"page":"33 - 42","abstract":[{"lang":"eng","text":"We present a new algorithm for enforcing incompressibility for Smoothed Particle Hydrodynamics (SPH) by preserving uniform density across the domain. We propose a hybrid method that uses a Poisson solve on a coarse grid to enforce a divergence free velocity field, followed by a local density correction of the particles. This avoids typical grid artifacts and maintains the Lagrangian nature of SPH by directly transferring pressures onto particles. Our method can be easily integrated with existing SPH techniques such as the incompressible PCISPH method as well as weakly compressible SPH by adding an additional force term. We show that this hybrid method accelerates convergence towards uniform density and permits a significantly larger time step compared to earlier approaches while producing similar results. We demonstrate our approach in a variety of scenarios with significant pressure gradients such as splashing liquids."}],"type":"conference","pubrep_id":"598","file":[{"relation":"main_file","file_id":"4769","date_updated":"2020-07-14T12:46:06Z","date_created":"2018-12-12T10:09:44Z","checksum":"6579d27709946e0eefbfa60a456b4913","file_name":"IST-2016-598-v1+1_HybridSPH_Preprint.pdf","access_level":"open_access","content_type":"application/pdf","file_size":2536216,"creator":"system"}],"oa_version":"Submitted Version","_id":"3298","user_id":"4435EBFC-F248-11E8-B48F-1D18A9856A87","title":"Hybrid smoothed particle hydrodynamics","status":"public","ddc":["000"],"month":"08","conference":{"name":"SCA: ACM SIGGRAPH/Eurographics Symposium on Computer animation","end_date":"2011-08-07","location":"Vancouver, Canada","start_date":"2011-08-05"},"doi":"10.1145/2019406.2019411","language":[{"iso":"eng"}],"oa":1,"quality_controlled":"1","file_date_updated":"2020-07-14T12:46:06Z","publist_id":"3343","author":[{"full_name":"Raveendran, Karthik","last_name":"Raveendran","first_name":"Karthik"},{"first_name":"Christopher J","last_name":"Wojtan","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6646-5546","full_name":"Wojtan, Christopher J"},{"full_name":"Turk, Greg","first_name":"Greg","last_name":"Turk"}],"date_created":"2018-12-11T12:02:32Z","date_updated":"2023-02-23T11:21:05Z","year":"2011","publication_status":"published","editor":[{"full_name":"Spencer, Stephen","first_name":"Stephen","last_name":"Spencer"}],"publisher":"ACM","department":[{"_id":"ChWo"}]},{"quality_controlled":"1","oa":1,"language":[{"iso":"eng"}],"doi":"10.1145/2037636.2037644","conference":{"name":"SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques","end_date":"2011-08-11","start_date":"2011-08-07","location":"Vancouver, BC, Canada"},"month":"08","publisher":"ACM","department":[{"_id":"ChWo"}],"publication_status":"published","year":"2011","date_created":"2018-12-11T12:02:31Z","date_updated":"2023-02-23T11:21:02Z","author":[{"last_name":"Wojtan","first_name":"Christopher J","orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J"},{"first_name":"Matthias","last_name":"Müller Fischer","full_name":"Müller Fischer, Matthias"},{"full_name":"Brochu, Tyson","last_name":"Brochu","first_name":"Tyson"}],"article_number":"8","publist_id":"3344","file_date_updated":"2020-07-14T12:46:06Z","citation":{"ama":"Wojtan C, Müller Fischer M, Brochu T. Liquid simulation with mesh-based surface tracking. In: ACM; 2011. doi:10.1145/2037636.2037644","apa":"Wojtan, C., Müller Fischer, M., & Brochu, T. (2011). Liquid simulation with mesh-based surface tracking. Presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Vancouver, BC, Canada: ACM. https://doi.org/10.1145/2037636.2037644","ieee":"C. Wojtan, M. Müller Fischer, and T. Brochu, “Liquid simulation with mesh-based surface tracking,” presented at the SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, Vancouver, BC, Canada, 2011.","ista":"Wojtan C, Müller Fischer M, Brochu T. 2011. Liquid simulation with mesh-based surface tracking. SIGGRAPH: Special Interest Group on Computer Graphics and Interactive Techniques, 8.","short":"C. Wojtan, M. Müller Fischer, T. Brochu, in:, ACM, 2011.","mla":"Wojtan, Chris, et al. Liquid Simulation with Mesh-Based Surface Tracking. 8, ACM, 2011, doi:10.1145/2037636.2037644.","chicago":"Wojtan, Chris, Matthias Müller Fischer, and Tyson Brochu. “Liquid Simulation with Mesh-Based Surface Tracking.” ACM, 2011. https://doi.org/10.1145/2037636.2037644."},"date_published":"2011-08-07T00:00:00Z","scopus_import":1,"has_accepted_license":"1","day":"07","status":"public","ddc":["000"],"title":"Liquid simulation with mesh-based surface tracking","_id":"3297","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","file":[{"access_level":"open_access","file_name":"IST-2016-599-v1+1_meshyFluidsCourseSIGGRAPH2011.pdf","creator":"system","content_type":"application/pdf","file_size":34672096,"file_id":"5018","relation":"main_file","checksum":"8d508ad7c82f50978acbaa4170ee0a75","date_updated":"2020-07-14T12:46:06Z","date_created":"2018-12-12T10:13:34Z"}],"oa_version":"Published Version","pubrep_id":"599","type":"conference","abstract":[{"lang":"eng","text":"Animating detailed liquid surfaces has always been a challenge for computer graphics researchers and visual effects artists. Over the past few years, researchers in this field have focused on mesh-based surface tracking to synthesize extremely detailed liquid surfaces as efficiently as possible. This course provides a solid understanding of the steps required to create a fluid simulator with a mesh-based liquid surface.\r\n\r\nThe course begins with an overview of several existing liquid-surface-tracking techniques and the pros and cons of each method. Then it explains how to embed a triangle mesh into a finite-difference-based fluid simulator and describes several methods for allowing the liquid surface to merge together or break apart. The final section showcases the benefits and further applications of a mesh-based liquid surface, highlighting state-of-the-art methods for tracking colors and textures, maintaining liquid volume, preserving small surface features, and simulating realistic surface-tension waves."}]}]