--- _id: '7418' abstract: - lang: eng text: Multiple importance sampling (MIS) has become an indispensable tool in Monte Carlo rendering, widely accepted as a near-optimal solution for combining different sampling techniques. But an MIS combination, using the common balance or power heuristics, often results in an overly defensive estimator, leading to high variance. We show that by generalizing the MIS framework, variance can be substantially reduced. Specifically, we optimize one of the combined sampling techniques so as to decrease the overall variance of the resulting MIS estimator. We apply the approach to the computation of direct illumination due to an HDR environment map and to the computation of global illumination using a path guiding algorithm. The implementation can be as simple as subtracting a constant value from the tabulated sampling density done entirely in a preprocessing step. This produces a consistent noise reduction in all our tests with no negative influence on run time, no artifacts or bias, and no failure cases. article_number: '151' article_processing_charge: No article_type: original author: - first_name: Ondřej full_name: Karlík, Ondřej last_name: Karlík - first_name: Martin full_name: Šik, Martin last_name: Šik - first_name: Petr full_name: Vévoda, Petr last_name: Vévoda - first_name: Tomas full_name: Skrivan, Tomas id: 486A5A46-F248-11E8-B48F-1D18A9856A87 last_name: Skrivan - first_name: Jaroslav full_name: Křivánek, Jaroslav last_name: Křivánek citation: ama: 'Karlík O, Šik M, Vévoda P, Skrivan T, Křivánek J. MIS compensation: Optimizing sampling techniques in multiple importance sampling. ACM Transactions on Graphics. 2019;38(6). doi:10.1145/3355089.3356565' apa: 'Karlík, O., Šik, M., Vévoda, P., Skrivan, T., & Křivánek, J. (2019). MIS compensation: Optimizing sampling techniques in multiple importance sampling. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/3355089.3356565' chicago: 'Karlík, Ondřej, Martin Šik, Petr Vévoda, Tomas Skrivan, and Jaroslav Křivánek. “MIS Compensation: Optimizing Sampling Techniques in Multiple Importance Sampling.” ACM Transactions on Graphics. ACM, 2019. https://doi.org/10.1145/3355089.3356565.' ieee: 'O. Karlík, M. Šik, P. Vévoda, T. Skrivan, and J. Křivánek, “MIS compensation: Optimizing sampling techniques in multiple importance sampling,” ACM Transactions on Graphics, vol. 38, no. 6. ACM, 2019.' ista: 'Karlík O, Šik M, Vévoda P, Skrivan T, Křivánek J. 2019. MIS compensation: Optimizing sampling techniques in multiple importance sampling. ACM Transactions on Graphics. 38(6), 151.' mla: 'Karlík, Ondřej, et al. “MIS Compensation: Optimizing Sampling Techniques in Multiple Importance Sampling.” ACM Transactions on Graphics, vol. 38, no. 6, 151, ACM, 2019, doi:10.1145/3355089.3356565.' short: O. Karlík, M. Šik, P. Vévoda, T. Skrivan, J. Křivánek, ACM Transactions on Graphics 38 (2019). date_created: 2020-01-30T10:19:43Z date_published: 2019-11-01T00:00:00Z date_updated: 2023-09-06T15:22:23Z day: '01' department: - _id: ChWo doi: 10.1145/3355089.3356565 external_id: isi: - '000498397300001' intvolume: ' 38' isi: 1 issue: '6' language: - iso: eng month: '11' oa_version: None publication: ACM Transactions on Graphics publication_identifier: eissn: - 1557-7368 issn: - 0730-0301 publication_status: published publisher: ACM quality_controlled: '1' scopus_import: '1' status: public title: 'MIS compensation: Optimizing sampling techniques in multiple importance sampling' type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 38 year: '2019' ... --- _id: '6642' abstract: - lang: eng text: We present a thermodynamically based approach to the design of models for viscoelastic fluids with stress diffusion effect. In particular, we show how to add a stress diffusion term to some standard viscoelastic rate-type models (Giesekus, FENE-P, Johnson–Segalman, Phan-Thien–Tanner and Bautista–Manero–Puig) so that the resulting models with the added stress diffusion term are thermodynamically consistent in the sense that they obey the first and the second law of thermodynamics. We point out the potential applications of the provided thermodynamical background in the study of flows of fluids described by the proposed models. article_number: '020002' article_processing_charge: No author: - first_name: Mark full_name: Dostalík, Mark last_name: Dostalík - first_name: Vít full_name: Pruša, Vít last_name: Pruša - first_name: Tomas full_name: Skrivan, Tomas id: 486A5A46-F248-11E8-B48F-1D18A9856A87 last_name: Skrivan citation: ama: 'Dostalík M, Pruša V, Skrivan T. On diffusive variants of some classical viscoelastic rate-type models. In: AIP Conference Proceedings. Vol 2107. AIP Publishing; 2019. doi:10.1063/1.5109493' apa: 'Dostalík, M., Pruša, V., & Skrivan, T. (2019). On diffusive variants of some classical viscoelastic rate-type models. In AIP Conference Proceedings (Vol. 2107). Zlin, Czech Republic: AIP Publishing. https://doi.org/10.1063/1.5109493' chicago: Dostalík, Mark, Vít Pruša, and Tomas Skrivan. “On Diffusive Variants of Some Classical Viscoelastic Rate-Type Models.” In AIP Conference Proceedings, Vol. 2107. AIP Publishing, 2019. https://doi.org/10.1063/1.5109493. ieee: M. Dostalík, V. Pruša, and T. Skrivan, “On diffusive variants of some classical viscoelastic rate-type models,” in AIP Conference Proceedings, Zlin, Czech Republic, 2019, vol. 2107. ista: Dostalík M, Pruša V, Skrivan T. 2019. On diffusive variants of some classical viscoelastic rate-type models. AIP Conference Proceedings. 8th International Conference on Novel Trends in Rheology vol. 2107, 020002. mla: Dostalík, Mark, et al. “On Diffusive Variants of Some Classical Viscoelastic Rate-Type Models.” AIP Conference Proceedings, vol. 2107, 020002, AIP Publishing, 2019, doi:10.1063/1.5109493. short: M. Dostalík, V. Pruša, T. Skrivan, in:, AIP Conference Proceedings, AIP Publishing, 2019. conference: end_date: 2019-07-31 location: Zlin, Czech Republic name: 8th International Conference on Novel Trends in Rheology start_date: 2019-07-30 date_created: 2019-07-15T10:07:09Z date_published: 2019-05-21T00:00:00Z date_updated: 2024-02-28T13:01:28Z day: '21' department: - _id: ChWo doi: 10.1063/1.5109493 external_id: arxiv: - '1902.07983' isi: - '000479303100002' intvolume: ' 2107' isi: 1 language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1902.07983 month: '05' oa: 1 oa_version: Preprint publication: AIP Conference Proceedings publication_status: published publisher: AIP Publishing quality_controlled: '1' scopus_import: '1' status: public title: On diffusive variants of some classical viscoelastic rate-type models type: conference user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 2107 year: '2019' ... --- _id: '135' abstract: - lang: eng text: The Fluid Implicit Particle method (FLIP) reduces numerical dissipation by combining particles with grids. To improve performance, the subsequent narrow band FLIP method (NB‐FLIP) uses a FLIP‐based fluid simulation only near the liquid surface and a traditional grid‐based fluid simulation away from the surface. This spatially‐limited FLIP simulation significantly reduces the number of particles and alleviates a computational bottleneck. In this paper, we extend the NB‐FLIP idea even further, by allowing a simulation to transition between a FLIP‐like fluid simulation and a grid‐based simulation in arbitrary locations, not just near the surface. This approach leads to even more savings in memory and computation, because we can concentrate the particles only in areas where they are needed. More importantly, this new method allows us to seamlessly transition to smooth implicit surface geometry wherever the particle‐based simulation is unnecessary. Consequently, our method leads to a practical algorithm for avoiding the noisy surface artifacts associated with particle‐based liquid simulations, while simultaneously maintaining the benefits of a FLIP simulation in regions of dynamic motion. alternative_title: - Eurographics article_processing_charge: No article_type: original author: - first_name: Takahiro full_name: Sato, Takahiro last_name: Sato - first_name: Christopher J full_name: Wojtan, Christopher J id: 3C61F1D2-F248-11E8-B48F-1D18A9856A87 last_name: Wojtan orcid: 0000-0001-6646-5546 - first_name: Nils full_name: Thuerey, Nils last_name: Thuerey - first_name: Takeo full_name: Igarashi, Takeo last_name: Igarashi - first_name: Ryoichi full_name: Ando, Ryoichi last_name: Ando citation: ama: Sato T, Wojtan C, Thuerey N, Igarashi T, Ando R. Extended narrow band FLIP for liquid simulations. Computer Graphics Forum. 2018;37(2):169-177. doi:10.1111/cgf.13351 apa: Sato, T., Wojtan, C., Thuerey, N., Igarashi, T., & Ando, R. (2018). Extended narrow band FLIP for liquid simulations. Computer Graphics Forum. Wiley. https://doi.org/10.1111/cgf.13351 chicago: Sato, Takahiro, Chris Wojtan, Nils Thuerey, Takeo Igarashi, and Ryoichi Ando. “Extended Narrow Band FLIP for Liquid Simulations.” Computer Graphics Forum. Wiley, 2018. https://doi.org/10.1111/cgf.13351. ieee: T. Sato, C. Wojtan, N. Thuerey, T. Igarashi, and R. Ando, “Extended narrow band FLIP for liquid simulations,” Computer Graphics Forum, vol. 37, no. 2. Wiley, pp. 169–177, 2018. 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.” Computer Graphics Forum, vol. 37, no. 2, Wiley, 2018, pp. 169–77, doi:10.1111/cgf.13351. short: T. Sato, C. Wojtan, N. Thuerey, T. Igarashi, R. Ando, Computer Graphics Forum 37 (2018) 169–177. date_created: 2018-12-11T11:44:49Z date_published: 2018-05-22T00:00:00Z date_updated: 2023-09-11T14:00:26Z day: '22' ddc: - '006' department: - _id: ChWo doi: 10.1111/cgf.13351 ec_funded: 1 external_id: isi: - '000434085600016' file: - access_level: open_access checksum: 8edb90da8a72395eb5d970580e0925b6 content_type: application/pdf creator: wojtan date_created: 2020-10-08T08:38:23Z date_updated: 2020-10-08T08:38:23Z file_id: '8627' file_name: exnbflip.pdf file_size: 54309947 relation: main_file success: 1 file_date_updated: 2020-10-08T08:38:23Z has_accepted_license: '1' intvolume: ' 37' isi: 1 issue: '2' language: - iso: eng month: '05' oa: 1 oa_version: Submitted Version page: 169 - 177 project: - _id: 2533E772-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '638176' name: Efficient Simulation of Natural Phenomena at Extremely Large Scales publication: Computer Graphics Forum publication_identifier: issn: - 0167-7055 publication_status: published publisher: Wiley quality_controlled: '1' scopus_import: '1' status: public title: Extended narrow band FLIP for liquid simulations type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 37 year: '2018' ... --- _id: '134' abstract: - lang: eng text: "The current state of the art in real-time two-dimensional water wave simulation requires developers to choose between efficient Fourier-based methods, which lack interactions with moving obstacles, and finite-difference or finite element methods, which handle environmental interactions but are significantly more expensive. This paper attempts to bridge this long-standing gap between complexity and performance, by proposing a new wave simulation method that can faithfully simulate wave interactions with moving obstacles in real time while simultaneously preserving minute details and accommodating very large simulation domains.\r\n\r\nPrevious methods for simulating 2D water waves directly compute the change in height of the water surface, a strategy which imposes limitations based on the CFL condition (fast moving waves require small time steps) and Nyquist's limit (small wave details require closely-spaced simulation variables). This paper proposes a novel wavelet transformation that discretizes the liquid motion in terms of amplitude-like functions that vary over space, frequency, and direction, effectively generalizing Fourier-based methods to handle local interactions. Because these new variables change much more slowly over space than the original water height function, our change of variables drastically reduces the limitations of the CFL condition and Nyquist limit, allowing us to simulate highly detailed water waves at very large visual resolutions. Our discretization is amenable to fast summation and easy to parallelize. We also present basic extensions like pre-computed wave paths and two-way solid fluid coupling. Finally, we argue that our discretization provides a convenient set of variables for artistic manipulation, which we illustrate with a novel wave-painting interface." acknowledged_ssus: - _id: ScienComp alternative_title: - SIGGRAPH article_number: '94' article_processing_charge: No author: - first_name: Stefan full_name: Jeschke, Stefan id: 44D6411A-F248-11E8-B48F-1D18A9856A87 last_name: Jeschke - first_name: Tomas full_name: Skrivan, Tomas id: 486A5A46-F248-11E8-B48F-1D18A9856A87 last_name: Skrivan - first_name: Matthias full_name: Mueller Fischer, Matthias last_name: Mueller Fischer - first_name: Nuttapong full_name: Chentanez, Nuttapong last_name: Chentanez - first_name: Miles full_name: Macklin, Miles last_name: Macklin - first_name: Christopher J full_name: Wojtan, Christopher J id: 3C61F1D2-F248-11E8-B48F-1D18A9856A87 last_name: Wojtan orcid: 0000-0001-6646-5546 citation: ama: Jeschke S, Skrivan T, Mueller Fischer M, Chentanez N, Macklin M, Wojtan C. Water surface wavelets. ACM Transactions on Graphics. 2018;37(4). doi:10.1145/3197517.3201336 apa: Jeschke, S., Skrivan, T., Mueller Fischer, M., Chentanez, N., Macklin, M., & Wojtan, C. (2018). Water surface wavelets. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/3197517.3201336 chicago: Jeschke, Stefan, Tomas Skrivan, Matthias Mueller Fischer, Nuttapong Chentanez, Miles Macklin, and Chris Wojtan. “Water Surface Wavelets.” ACM Transactions on Graphics. ACM, 2018. https://doi.org/10.1145/3197517.3201336. ieee: S. Jeschke, T. Skrivan, M. Mueller Fischer, N. Chentanez, M. Macklin, and C. Wojtan, “Water surface wavelets,” ACM Transactions on Graphics, vol. 37, no. 4. ACM, 2018. 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. mla: Jeschke, Stefan, et al. “Water Surface Wavelets.” ACM Transactions on Graphics, vol. 37, no. 4, 94, ACM, 2018, doi:10.1145/3197517.3201336. short: S. Jeschke, T. Skrivan, M. Mueller Fischer, N. Chentanez, M. Macklin, C. Wojtan, ACM Transactions on Graphics 37 (2018). date_created: 2018-12-11T11:44:48Z date_published: 2018-07-30T00:00:00Z date_updated: 2024-02-28T13:58:51Z day: '30' ddc: - '000' department: - _id: ChWo doi: 10.1145/3197517.3201336 ec_funded: 1 external_id: isi: - '000448185000055' file: - access_level: open_access checksum: db75ebabe2ec432bf41389e614d6ef62 content_type: application/pdf creator: dernst date_created: 2018-12-18T09:59:23Z date_updated: 2020-07-14T12:44:45Z file_id: '5744' file_name: 2018_ACM_Jeschke.pdf file_size: 22185016 relation: main_file file_date_updated: 2020-07-14T12:44:45Z has_accepted_license: '1' intvolume: ' 37' isi: 1 issue: '4' language: - iso: eng month: '07' oa: 1 oa_version: Published Version project: - _id: 2533E772-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '638176' name: Efficient Simulation of Natural Phenomena at Extremely Large Scales - _id: 2564DBCA-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '665385' name: International IST Doctoral Program publication: ACM Transactions on Graphics publication_status: published publisher: ACM publist_id: '7789' quality_controlled: '1' related_material: link: - description: News on IST Homepage relation: press_release url: https://ist.ac.at/en/news/new-water-simulation-captures-small-details-even-in-large-scenes/ scopus_import: '1' status: public title: Water surface wavelets tmp: image: /images/cc_by_nc_sa.png legal_code_url: https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode name: Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) short: CC BY-NC-SA (4.0) type: journal_article user_id: 2EBD1598-F248-11E8-B48F-1D18A9856A87 volume: 37 year: '2018' ... --- _id: '470' abstract: - lang: eng text: This paper presents a method for simulating water surface waves as a displacement field on a 2D domain. Our method relies on Lagrangian particles that carry packets of water wave energy; each packet carries information about an entire group of wave trains, as opposed to only a single wave crest. Our approach is unconditionally stable and can simulate high resolution geometric details. This approach also presents a straightforward interface for artistic control, because it is essentially a particle system with intuitive parameters like wavelength and amplitude. Our implementation parallelizes well and runs in real time for moderately challenging scenarios. acknowledged_ssus: - _id: ScienComp article_number: '103' article_processing_charge: Yes (in subscription journal) article_type: original author: - first_name: Stefan full_name: Jeschke, Stefan id: 44D6411A-F248-11E8-B48F-1D18A9856A87 last_name: Jeschke - first_name: Christopher J full_name: Wojtan, Christopher J id: 3C61F1D2-F248-11E8-B48F-1D18A9856A87 last_name: Wojtan orcid: 0000-0001-6646-5546 citation: ama: Jeschke S, Wojtan C. Water wave packets. ACM Transactions on Graphics. 2017;36(4). doi:10.1145/3072959.3073678 apa: Jeschke, S., & Wojtan, C. (2017). Water wave packets. ACM Transactions on Graphics. ACM. https://doi.org/10.1145/3072959.3073678 chicago: Jeschke, Stefan, and Chris Wojtan. “Water Wave Packets.” ACM Transactions on Graphics. ACM, 2017. https://doi.org/10.1145/3072959.3073678. ieee: S. Jeschke and C. Wojtan, “Water wave packets,” ACM Transactions on Graphics, vol. 36, no. 4. ACM, 2017. ista: Jeschke S, Wojtan C. 2017. Water wave packets. ACM Transactions on Graphics. 36(4), 103. mla: Jeschke, Stefan, and Chris Wojtan. “Water Wave Packets.” ACM Transactions on Graphics, vol. 36, no. 4, 103, ACM, 2017, doi:10.1145/3072959.3073678. short: S. Jeschke, C. Wojtan, ACM Transactions on Graphics 36 (2017). date_created: 2018-12-11T11:46:39Z date_published: 2017-07-01T00:00:00Z date_updated: 2023-02-23T12:20:26Z day: '01' ddc: - '006' department: - _id: ChWo doi: 10.1145/3072959.3073678 ec_funded: 1 file: - access_level: open_access checksum: 82a3b2bfeee4ddef16ecc21675d1a48a content_type: application/pdf creator: wojtan date_created: 2020-01-24T09:32:35Z date_updated: 2020-07-14T12:46:34Z file_id: '7359' file_name: wavepackets_final.pdf file_size: 13131683 relation: main_file file_date_updated: 2020-07-14T12:46:34Z has_accepted_license: '1' intvolume: ' 36' issue: '4' language: - iso: eng month: '07' oa: 1 oa_version: Published Version project: - _id: 2533E772-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '638176' name: Efficient Simulation of Natural Phenomena at Extremely Large Scales publication: ACM Transactions on Graphics publication_identifier: issn: - '07300301' publication_status: published publisher: ACM publist_id: '7350' quality_controlled: '1' scopus_import: 1 status: public title: Water wave packets type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 36 year: '2017' ... --- _id: '670' abstract: - lang: eng text: We propose an efficient method to model paper tearing in the context of interactive modeling. The method uses geometrical information to automatically detect potential starting points of tears. We further introduce a new hybrid geometrical and physical-based method to compute the trajectory of tears while procedurally synthesizing high resolution details of the tearing path using a texture based approach. The results obtained are compared with real paper and with previous studies on the expected geometric paths of paper that tears. article_processing_charge: No article_type: original author: - first_name: Camille full_name: Schreck, Camille id: 2B14B676-F248-11E8-B48F-1D18A9856A87 last_name: Schreck - first_name: Damien full_name: Rohmer, Damien last_name: Rohmer - first_name: Stefanie full_name: Hahmann, Stefanie last_name: Hahmann citation: ama: Schreck C, Rohmer D, Hahmann S. Interactive paper tearing. Computer Graphics Forum. 2017;36(2):95-106. doi:10.1111/cgf.13110 apa: Schreck, C., Rohmer, D., & Hahmann, S. (2017). Interactive paper tearing. Computer Graphics Forum. Wiley. https://doi.org/10.1111/cgf.13110 chicago: Schreck, Camille, Damien Rohmer, and Stefanie Hahmann. “Interactive Paper Tearing.” Computer Graphics Forum. Wiley, 2017. https://doi.org/10.1111/cgf.13110. ieee: C. Schreck, D. Rohmer, and S. Hahmann, “Interactive paper tearing,” Computer Graphics Forum, vol. 36, no. 2. Wiley, pp. 95–106, 2017. ista: Schreck C, Rohmer D, Hahmann S. 2017. Interactive paper tearing. Computer Graphics Forum. 36(2), 95–106. mla: Schreck, Camille, et al. “Interactive Paper Tearing.” Computer Graphics Forum, vol. 36, no. 2, Wiley, 2017, pp. 95–106, doi:10.1111/cgf.13110. short: C. Schreck, D. Rohmer, S. Hahmann, Computer Graphics Forum 36 (2017) 95–106. date_created: 2018-12-11T11:47:49Z date_published: 2017-05-01T00:00:00Z date_updated: 2021-01-12T08:08:37Z day: '01' ddc: - '000' department: - _id: ChWo doi: 10.1111/cgf.13110 intvolume: ' 36' issue: '2' language: - iso: eng main_file_link: - open_access: '1' url: https://hal.inria.fr/hal-01647113/file/eg_2017_schreck_paper_tearing.pdf month: '05' oa: 1 oa_version: Published Version page: 95 - 106 project: - _id: 25357BD2-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: P 24352-N23 name: 'Deep Pictures: Creating Visual and Haptic Vector Images' publication: Computer Graphics Forum publication_identifier: issn: - '01677055' publication_status: published publisher: Wiley publist_id: '7056' quality_controlled: '1' scopus_import: 1 status: public title: Interactive paper tearing type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 36 year: '2017' ... --- _id: '1367' abstract: - lang: eng text: One of the major challenges in physically based modelling is making simulations efficient. Adaptive models provide an essential solution to these efficiency goals. These models are able to self-adapt in space and time, attempting to provide the best possible compromise between accuracy and speed. This survey reviews the adaptive solutions proposed so far in computer graphics. Models are classified according to the strategy they use for adaptation, from time-stepping and freezing techniques to geometric adaptivity in the form of structured grids, meshes and particles. Applications range from fluids, through deformable bodies, to articulated solids. acknowledgement: This work was partly supported by the starting grants ADAPT and BigSplash, as well as the advanced grant EXPRESSIVE from the European Research Council (ERC-2012-StG_20111012, ERC-2014-StG_638176 and ERC-2011-ADG_20110209). article_processing_charge: No author: - first_name: Pierre full_name: Manteaux, Pierre last_name: Manteaux - first_name: Christopher J full_name: Wojtan, Christopher J id: 3C61F1D2-F248-11E8-B48F-1D18A9856A87 last_name: Wojtan orcid: 0000-0001-6646-5546 - first_name: Rahul full_name: Narain, Rahul last_name: Narain - first_name: Stéphane full_name: Redon, Stéphane last_name: Redon - first_name: François full_name: Faure, François last_name: Faure - first_name: Marie full_name: Cani, Marie last_name: Cani citation: ama: Manteaux P, Wojtan C, Narain R, Redon S, Faure F, Cani M. Adaptive physically based models in computer graphics. Computer Graphics Forum. 2017;36(6):312-337. doi:10.1111/cgf.12941 apa: Manteaux, P., Wojtan, C., Narain, R., Redon, S., Faure, F., & Cani, M. (2017). Adaptive physically based models in computer graphics. Computer Graphics Forum. Wiley-Blackwell. https://doi.org/10.1111/cgf.12941 chicago: Manteaux, Pierre, Chris Wojtan, Rahul Narain, Stéphane Redon, François Faure, and Marie Cani. “Adaptive Physically Based Models in Computer Graphics.” Computer Graphics Forum. Wiley-Blackwell, 2017. https://doi.org/10.1111/cgf.12941. ieee: P. Manteaux, C. Wojtan, R. Narain, S. Redon, F. Faure, and M. Cani, “Adaptive physically based models in computer graphics,” Computer Graphics Forum, vol. 36, no. 6. Wiley-Blackwell, pp. 312–337, 2017. ista: Manteaux P, Wojtan C, Narain R, Redon S, Faure F, Cani M. 2017. Adaptive physically based models in computer graphics. Computer Graphics Forum. 36(6), 312–337. mla: Manteaux, Pierre, et al. “Adaptive Physically Based Models in Computer Graphics.” Computer Graphics Forum, vol. 36, no. 6, Wiley-Blackwell, 2017, pp. 312–37, doi:10.1111/cgf.12941. short: P. Manteaux, C. Wojtan, R. Narain, S. Redon, F. Faure, M. Cani, Computer Graphics Forum 36 (2017) 312–337. date_created: 2018-12-11T11:51:37Z date_published: 2017-09-01T00:00:00Z date_updated: 2023-09-20T11:05:36Z day: '01' ddc: - '000' department: - _id: ChWo doi: 10.1111/cgf.12941 external_id: isi: - '000408634200019' file: - access_level: open_access checksum: 7676e9a9ead6d58c3000988c97deb2ef content_type: application/pdf creator: system date_created: 2018-12-12T10:16:21Z date_updated: 2020-07-14T12:44:47Z file_id: '5208' file_name: IST-2016-634-v1+1_starAdaptivity-cgf.pdf file_size: 1434439 relation: main_file file_date_updated: 2020-07-14T12:44:47Z has_accepted_license: '1' intvolume: ' 36' isi: 1 issue: '6' language: - iso: eng month: '09' oa: 1 oa_version: Submitted Version page: 312 - 337 publication: Computer Graphics Forum publication_identifier: issn: - '01677055' publication_status: published publisher: Wiley-Blackwell publist_id: '5873' pubrep_id: '634' quality_controlled: '1' scopus_import: '1' status: public title: Adaptive physically based models in computer graphics type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 36 year: '2017' ... --- _id: '1152' abstract: - lang: eng text: We propose a new memetic strategy that can solve the multi-physics, complex inverse problems, formulated as the multi-objective optimization ones, in which objectives are misfits between the measured and simulated states of various governing processes. The multi-deme structure of the strategy allows for both, intensive, relatively cheap exploration with a moderate accuracy and more accurate search many regions of Pareto set in parallel. The special type of selection operator prefers the coherent alternative solutions, eliminating artifacts appearing in the particular processes. The additional accuracy increment is obtained by the parallel convex searches applied to the local scalarizations of the misfit vector. The strategy is dedicated for solving ill-conditioned problems, for which inverting the single physical process can lead to the ambiguous results. The skill of the selection in artifact elimination is shown on the benchmark problem, while the whole strategy was applied for identification of oil deposits, where the misfits are related to various frequencies of the magnetic and electric waves of the magnetotelluric measurements. 2016 Elsevier B.V. article_processing_charge: No author: - first_name: Ewa P full_name: Gajda-Zagorska, Ewa P id: 47794CF0-F248-11E8-B48F-1D18A9856A87 last_name: Gajda-Zagorska - first_name: Robert full_name: Schaefer, Robert last_name: Schaefer - first_name: Maciej full_name: Smołka, Maciej last_name: Smołka - first_name: David full_name: Pardo, David last_name: Pardo - first_name: Julen full_name: Alvarez Aramberri, Julen last_name: Alvarez Aramberri citation: ama: Gajda-Zagorska EP, Schaefer R, Smołka M, Pardo D, Alvarez Aramberri J. A multi objective memetic inverse solver reinforced by local optimization methods. Journal of Computational Science. 2017;18:85-94. doi:10.1016/j.jocs.2016.06.007 apa: Gajda-Zagorska, E. P., Schaefer, R., Smołka, M., Pardo, D., & Alvarez Aramberri, J. (2017). A multi objective memetic inverse solver reinforced by local optimization methods. Journal of Computational Science. Elsevier. https://doi.org/10.1016/j.jocs.2016.06.007 chicago: Gajda-Zagorska, Ewa P, Robert Schaefer, Maciej Smołka, David Pardo, and Julen Alvarez Aramberri. “A Multi Objective Memetic Inverse Solver Reinforced by Local Optimization Methods.” Journal of Computational Science. Elsevier, 2017. https://doi.org/10.1016/j.jocs.2016.06.007. ieee: E. P. Gajda-Zagorska, R. Schaefer, M. Smołka, D. Pardo, and J. Alvarez Aramberri, “A multi objective memetic inverse solver reinforced by local optimization methods,” Journal of Computational Science, vol. 18. Elsevier, pp. 85–94, 2017. ista: Gajda-Zagorska EP, Schaefer R, Smołka M, Pardo D, Alvarez Aramberri J. 2017. A multi objective memetic inverse solver reinforced by local optimization methods. Journal of Computational Science. 18, 85–94. mla: Gajda-Zagorska, Ewa P., et al. “A Multi Objective Memetic Inverse Solver Reinforced by Local Optimization Methods.” Journal of Computational Science, vol. 18, Elsevier, 2017, pp. 85–94, doi:10.1016/j.jocs.2016.06.007. short: E.P. Gajda-Zagorska, R. Schaefer, M. Smołka, D. Pardo, J. Alvarez Aramberri, Journal of Computational Science 18 (2017) 85–94. date_created: 2018-12-11T11:50:26Z date_published: 2017-01-01T00:00:00Z date_updated: 2023-09-20T11:29:44Z day: '01' ddc: - '000' department: - _id: ChWo doi: 10.1016/j.jocs.2016.06.007 external_id: isi: - '000393528700009' file: - access_level: open_access content_type: application/pdf creator: dernst date_created: 2019-01-18T08:43:16Z date_updated: 2019-01-18T08:43:16Z file_id: '5842' file_name: 2016_jocs_ewa.pdf file_size: 1083911 relation: main_file success: 1 file_date_updated: 2019-01-18T08:43:16Z has_accepted_license: '1' intvolume: ' 18' isi: 1 language: - iso: eng month: '01' oa: 1 oa_version: Submitted Version page: 85 - 94 publication: Journal of Computational Science publication_identifier: issn: - '18777503' publication_status: published publisher: Elsevier publist_id: '6206' quality_controlled: '1' scopus_import: '1' status: public title: A multi objective memetic inverse solver reinforced by local optimization methods type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 18 year: '2017' ... --- _id: '998' abstract: - lang: eng text: 'A major open problem on the road to artificial intelligence is the development of incrementally learning systems that learn about more and more concepts over time from a stream of data. In this work, we introduce a new training strategy, iCaRL, that allows learning in such a class-incremental way: only the training data for a small number of classes has to be present at the same time and new classes can be added progressively. iCaRL learns strong classifiers and a data representation simultaneously. This distinguishes it from earlier works that were fundamentally limited to fixed data representations and therefore incompatible with deep learning architectures. We show by experiments on CIFAR-100 and ImageNet ILSVRC 2012 data that iCaRL can learn many classes incrementally over a long period of time where other strategies quickly fail. ' article_processing_charge: No author: - first_name: Sylvestre Alvise full_name: Rebuffi, Sylvestre Alvise last_name: Rebuffi - first_name: Alexander full_name: Kolesnikov, Alexander id: 2D157DB6-F248-11E8-B48F-1D18A9856A87 last_name: Kolesnikov - first_name: Georg full_name: Sperl, Georg id: 4DD40360-F248-11E8-B48F-1D18A9856A87 last_name: Sperl - first_name: Christoph full_name: Lampert, Christoph id: 40C20FD2-F248-11E8-B48F-1D18A9856A87 last_name: Lampert orcid: 0000-0001-8622-7887 citation: ama: 'Rebuffi SA, Kolesnikov A, Sperl G, Lampert C. iCaRL: Incremental classifier and representation learning. In: Vol 2017. IEEE; 2017:5533-5542. doi:10.1109/CVPR.2017.587' apa: 'Rebuffi, S. A., Kolesnikov, A., Sperl, G., & Lampert, C. (2017). iCaRL: Incremental classifier and representation learning (Vol. 2017, pp. 5533–5542). Presented at the CVPR: Computer Vision and Pattern Recognition, Honolulu, HA, United States: IEEE. https://doi.org/10.1109/CVPR.2017.587' chicago: 'Rebuffi, Sylvestre Alvise, Alexander Kolesnikov, Georg Sperl, and Christoph Lampert. “ICaRL: Incremental Classifier and Representation Learning,” 2017:5533–42. IEEE, 2017. https://doi.org/10.1109/CVPR.2017.587.' ieee: 'S. A. Rebuffi, A. Kolesnikov, G. Sperl, and C. Lampert, “iCaRL: Incremental classifier and representation learning,” presented at the CVPR: Computer Vision and Pattern Recognition, Honolulu, HA, United States, 2017, vol. 2017, pp. 5533–5542.' ista: 'Rebuffi SA, Kolesnikov A, Sperl G, Lampert C. 2017. iCaRL: Incremental classifier and representation learning. CVPR: Computer Vision and Pattern Recognition vol. 2017, 5533–5542.' mla: 'Rebuffi, Sylvestre Alvise, et al. ICaRL: Incremental Classifier and Representation Learning. Vol. 2017, IEEE, 2017, pp. 5533–42, doi:10.1109/CVPR.2017.587.' short: S.A. Rebuffi, A. Kolesnikov, G. Sperl, C. Lampert, in:, IEEE, 2017, pp. 5533–5542. conference: end_date: 2017-07-26 location: Honolulu, HA, United States name: 'CVPR: Computer Vision and Pattern Recognition' start_date: 2017-07-21 date_created: 2018-12-11T11:49:37Z date_published: 2017-04-14T00:00:00Z date_updated: 2023-09-22T09:51:58Z day: '14' department: - _id: ChLa - _id: ChWo doi: 10.1109/CVPR.2017.587 ec_funded: 1 external_id: isi: - '000418371405066' intvolume: ' 2017' isi: 1 language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1611.07725 month: '04' oa: 1 oa_version: Submitted Version page: 5533 - 5542 project: - _id: 2532554C-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '308036' name: Lifelong Learning of Visual Scene Understanding publication_identifier: isbn: - 978-153860457-1 publication_status: published publisher: IEEE publist_id: '6400' quality_controlled: '1' scopus_import: '1' status: public title: 'iCaRL: Incremental classifier and representation learning' type: conference user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 2017 year: '2017' ... --- _id: '839' abstract: - lang: eng 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. ' 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" alternative_title: - ISTA Thesis article_processing_charge: No author: - first_name: David full_name: Hahn, David id: 357A6A66-F248-11E8-B48F-1D18A9856A87 last_name: Hahn citation: ama: Hahn D. Brittle fracture simulation with boundary elements for computer graphics. 2017. doi:10.15479/AT:ISTA:th_855 apa: Hahn, D. (2017). Brittle fracture simulation with boundary elements for computer graphics. Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:th_855 chicago: Hahn, David. “Brittle Fracture Simulation with Boundary Elements for Computer Graphics.” Institute of Science and Technology Austria, 2017. https://doi.org/10.15479/AT:ISTA:th_855. ieee: D. Hahn, “Brittle fracture simulation with boundary elements for computer graphics,” Institute of Science and Technology Austria, 2017. ista: Hahn D. 2017. Brittle fracture simulation with boundary elements for computer graphics. Institute of Science and Technology Austria. mla: Hahn, David. Brittle Fracture Simulation with Boundary Elements for Computer Graphics. Institute of Science and Technology Austria, 2017, doi:10.15479/AT:ISTA:th_855. short: D. Hahn, Brittle Fracture Simulation with Boundary Elements for Computer Graphics, Institute of Science and Technology Austria, 2017. date_created: 2018-12-11T11:48:47Z date_published: 2017-08-14T00:00:00Z date_updated: 2024-02-21T13:48:02Z day: '14' ddc: - '004' - '005' - '006' - '531' - '621' degree_awarded: PhD department: - _id: ChWo doi: 10.15479/AT:ISTA:th_855 ec_funded: 1 file: - access_level: open_access checksum: 6c1ae8c90bfaba5e089417fefbc4a272 content_type: application/pdf creator: system date_created: 2018-12-12T10:14:46Z date_updated: 2020-07-14T12:48:13Z file_id: '5100' file_name: IST-2017-855-v1+1_thesis_online_pdfA.pdf file_size: 14596191 relation: main_file - access_level: closed checksum: 421672f68d563b029869c5cf1713f919 content_type: application/zip creator: dernst date_created: 2019-04-05T08:40:30Z date_updated: 2020-07-14T12:48:13Z file_id: '6207' file_name: 2017_thesis_Hahn_source.zip file_size: 15060566 relation: source_file file_date_updated: 2020-07-14T12:48:13Z has_accepted_license: '1' language: - iso: eng month: '08' oa: 1 oa_version: Published Version page: '124' project: - _id: 2533E772-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '638176' name: Efficient Simulation of Natural Phenomena at Extremely Large Scales publication_identifier: issn: - 2663-337X publication_status: published publisher: Institute of Science and Technology Austria publist_id: '6809' pubrep_id: '855' related_material: record: - id: '1362' relation: part_of_dissertation status: public - id: '1633' relation: part_of_dissertation status: public - id: '5568' relation: popular_science status: public status: public supervisor: - first_name: Christopher J full_name: Wojtan, Christopher J id: 3C61F1D2-F248-11E8-B48F-1D18A9856A87 last_name: Wojtan orcid: 0000-0001-6646-5546 title: Brittle fracture simulation with boundary elements for computer graphics tmp: image: /images/cc_by_sa.png legal_code_url: https://creativecommons.org/licenses/by-sa/4.0/legalcode name: Creative Commons Attribution-ShareAlike 4.0 International Public License (CC BY-SA 4.0) short: CC BY-SA (4.0) type: dissertation user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 year: '2017' ... --- _id: '5568' 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) article_processing_charge: No author: - first_name: David full_name: Hahn, David id: 357A6A66-F248-11E8-B48F-1D18A9856A87 last_name: Hahn citation: ama: 'Hahn D. Source codes: Brittle fracture simulation with boundary elements for computer graphics. 2017. doi:10.15479/AT:ISTA:73' apa: 'Hahn, D. (2017). Source codes: Brittle fracture simulation with boundary elements for computer graphics. Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:73' chicago: 'Hahn, David. “Source Codes: Brittle Fracture Simulation with Boundary Elements for Computer Graphics.” Institute of Science and Technology Austria, 2017. https://doi.org/10.15479/AT:ISTA:73.' ieee: 'D. Hahn, “Source codes: Brittle fracture simulation with boundary elements for computer graphics.” Institute of Science and Technology Austria, 2017.' ista: 'Hahn D. 2017. Source codes: Brittle fracture simulation with boundary elements for computer graphics, Institute of Science and Technology Austria, 10.15479/AT:ISTA:73.' mla: 'Hahn, David. Source Codes: Brittle Fracture Simulation with Boundary Elements for Computer Graphics. Institute of Science and Technology Austria, 2017, doi:10.15479/AT:ISTA:73.' short: D. Hahn, (2017). datarep_id: '73' date_created: 2018-12-12T12:31:35Z date_published: 2017-08-16T00:00:00Z date_updated: 2024-02-21T13:48:02Z day: '16' ddc: - '004' department: - _id: ChWo doi: 10.15479/AT:ISTA:73 ec_funded: 1 file: - access_level: open_access checksum: 2323a755842a3399cbc47d76545fc9a0 content_type: application/zip creator: system date_created: 2018-12-12T13:02:57Z date_updated: 2020-07-14T12:47:04Z file_id: '5615' file_name: IST-2017-73-v1+1_FractureRB_v1.1_2017_07_20_final_public.zip file_size: 199353471 relation: main_file file_date_updated: 2020-07-14T12:47:04Z has_accepted_license: '1' keyword: - Boundary elements - brittle fracture - computer graphics - fracture simulation month: '08' oa: 1 oa_version: Published Version project: - _id: 2533E772-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '638176' name: Efficient Simulation of Natural Phenomena at Extremely Large Scales publisher: Institute of Science and Technology Austria related_material: record: - id: '839' relation: research_paper status: public status: public title: 'Source codes: Brittle fracture simulation with boundary elements for computer graphics' tmp: image: /images/cc_by_sa.png legal_code_url: https://creativecommons.org/licenses/by-sa/4.0/legalcode name: Creative Commons Attribution-ShareAlike 4.0 International Public License (CC BY-SA 4.0) short: CC BY-SA (4.0) type: research_data user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2017' ... --- _id: '1136' abstract: - lang: eng text: We propose an interactive sculpting system for seamlessly editing pre-computed animations of liquid, without the need for any resimulation. The input is a sequence of meshes without correspondences representing the liquid surface over time. Our method enables the efficient selection of consistent space-time parts of this animation, such as moving waves or droplets, which we call space-time features. Once selected, a feature can be copied, edited, or duplicated and then pasted back anywhere in space and time in the same or in another liquid animation sequence. Our method circumvents tedious user interactions by automatically computing the spatial and temporal ranges of the selected feature. We also provide space-time shape editing tools for non-uniform scaling, rotation, trajectory changes, and temporal editing to locally speed up or slow down motion. Using our tools, the user can edit and progressively refine any input simulation result, possibly using a library of precomputed space-time features extracted from other animations. In contrast to the trial-and-error loop usually required to edit animation results through the tuning of indirect simulation parameters, our method gives the user full control over the edited space-time behaviors. © 2016 Copyright held by the owner/author(s). acknowledgement: This work was partly supported by the starting grant BigSplash, as well as the advanced grant EXPRESSIVE from the European Research Council (ERC-2014-StG 638176 , and ERC-2011-ADG 20110209). article_number: '2994261' article_processing_charge: No author: - first_name: Pierre full_name: Manteaux, Pierre last_name: Manteaux - first_name: Ulysse full_name: Vimont, Ulysse last_name: Vimont - first_name: Christopher J full_name: Wojtan, Christopher J id: 3C61F1D2-F248-11E8-B48F-1D18A9856A87 last_name: Wojtan orcid: 0000-0001-6646-5546 - first_name: Damien full_name: Rohmer, Damien last_name: Rohmer - first_name: Marie full_name: Cani, Marie last_name: Cani citation: ama: 'Manteaux P, Vimont U, Wojtan C, Rohmer D, Cani M. Space-time sculpting of liquid animation. In: Proceedings of the 9th International Conference on Motion in Games . ACM; 2016. doi:10.1145/2994258.2994261' apa: 'Manteaux, P., Vimont, U., Wojtan, C., Rohmer, D., & Cani, M. (2016). Space-time sculpting of liquid animation. In Proceedings of the 9th International Conference on Motion in Games . San Francisco, CA, USA: ACM. https://doi.org/10.1145/2994258.2994261' chicago: Manteaux, Pierre, Ulysse Vimont, Chris Wojtan, Damien Rohmer, and Marie Cani. “Space-Time Sculpting of Liquid Animation.” In Proceedings of the 9th International Conference on Motion in Games . ACM, 2016. https://doi.org/10.1145/2994258.2994261. ieee: P. Manteaux, U. Vimont, C. Wojtan, D. Rohmer, and M. Cani, “Space-time sculpting of liquid animation,” in Proceedings of the 9th International Conference on Motion in Games , San Francisco, CA, USA, 2016. 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.” Proceedings of the 9th International Conference on Motion in Games , 2994261, ACM, 2016, doi:10.1145/2994258.2994261. short: P. Manteaux, U. Vimont, C. Wojtan, D. Rohmer, M. Cani, in:, Proceedings of the 9th International Conference on Motion in Games , ACM, 2016. conference: end_date: 2016-10-12 location: San Francisco, CA, USA name: 'MIG: Motion in Games' start_date: 2016-10-10 date_created: 2018-12-11T11:50:20Z date_published: 2016-10-10T00:00:00Z date_updated: 2023-02-21T09:49:49Z day: '10' ddc: - '004' department: - _id: ChWo doi: 10.1145/2994258.2994261 ec_funded: 1 has_accepted_license: '1' language: - iso: eng main_file_link: - open_access: '1' url: https://hal.inria.fr/hal-01367181 month: '10' oa: 1 oa_version: Submitted Version project: - _id: 2533E772-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '638176' name: Efficient Simulation of Natural Phenomena at Extremely Large Scales publication: 'Proceedings of the 9th International Conference on Motion in Games ' publication_status: published publisher: ACM publist_id: '6222' quality_controlled: '1' scopus_import: '1' status: public title: Space-time sculpting of liquid animation type: conference user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2016' ... --- _id: '1141' abstract: - lang: eng text: In this paper we introduce the Multiobjective Optimization Hierarchic Genetic Strategy with maturing (MO-mHGS), a meta-algorithm that performs evolutionary optimization in a hierarchy of populations. The maturing mechanism improves growth and reduces redundancy. The performance of MO-mHGS with selected state-of-the-art multiobjective evolutionary algorithms as internal algorithms is analysed on benchmark problems and their modifications for which single fitness evaluation time depends on the solution accuracy. We compare the proposed algorithm with the Island Model Genetic Algorithm as well as with single-deme methods, and discuss the impact of internal algorithms on the MO-mHGS meta-algorithm. © 2016 Elsevier B.V. acknowledgement: The work presented in this paper was partially supported by Polish National Science Centre grant nos. DEC-2012/05/N/ST6/03433 and DEC-2011/03/B/ST6/01393. Radosław Łazarz was supported by Polish National Science Centre grant no. DEC-2013/10/M/ST6/00531. author: - first_name: Radosław full_name: Łazarz, Radosław last_name: Łazarz - first_name: Michał full_name: Idzik, Michał last_name: Idzik - first_name: Konrad full_name: Gądek, Konrad last_name: Gądek - first_name: Ewa P full_name: Gajda-Zagorska, Ewa P id: 47794CF0-F248-11E8-B48F-1D18A9856A87 last_name: Gajda-Zagorska citation: ama: Łazarz R, Idzik M, Gądek K, Gajda-Zagorska EP. Hierarchic genetic strategy with maturing as a generic tool for multiobjective optimization. Journal of Computational Science. 2016;17(1):249-260. doi:10.1016/j.jocs.2016.03.004 apa: Łazarz, R., Idzik, M., Gądek, K., & Gajda-Zagorska, E. P. (2016). Hierarchic genetic strategy with maturing as a generic tool for multiobjective optimization. Journal of Computational Science. Elsevier. https://doi.org/10.1016/j.jocs.2016.03.004 chicago: Łazarz, Radosław, Michał Idzik, Konrad Gądek, and Ewa P Gajda-Zagorska. “Hierarchic Genetic Strategy with Maturing as a Generic Tool for Multiobjective Optimization.” Journal of Computational Science. Elsevier, 2016. https://doi.org/10.1016/j.jocs.2016.03.004. ieee: R. Łazarz, M. Idzik, K. Gądek, and E. P. Gajda-Zagorska, “Hierarchic genetic strategy with maturing as a generic tool for multiobjective optimization,” Journal of Computational Science, vol. 17, no. 1. Elsevier, pp. 249–260, 2016. ista: Łazarz R, Idzik M, Gądek K, Gajda-Zagorska EP. 2016. Hierarchic genetic strategy with maturing as a generic tool for multiobjective optimization. Journal of Computational Science. 17(1), 249–260. mla: Łazarz, Radosław, et al. “Hierarchic Genetic Strategy with Maturing as a Generic Tool for Multiobjective Optimization.” Journal of Computational Science, vol. 17, no. 1, Elsevier, 2016, pp. 249–60, doi:10.1016/j.jocs.2016.03.004. short: R. Łazarz, M. Idzik, K. Gądek, E.P. Gajda-Zagorska, Journal of Computational Science 17 (2016) 249–260. date_created: 2018-12-11T11:50:22Z date_published: 2016-11-01T00:00:00Z date_updated: 2021-01-12T06:48:35Z day: '01' department: - _id: ChWo doi: 10.1016/j.jocs.2016.03.004 intvolume: ' 17' issue: '1' language: - iso: eng month: '11' oa_version: None page: 249 - 260 publication: Journal of Computational Science publication_status: published publisher: Elsevier publist_id: '6217' quality_controlled: '1' scopus_import: 1 status: public title: Hierarchic genetic strategy with maturing as a generic tool for multiobjective optimization type: journal_article user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87 volume: 17 year: '2016' ... --- _id: '1363' abstract: - lang: eng text: When aiming to seamlessly integrate a fluid simulation into a larger scenario (like an open ocean), careful attention must be paid to boundary conditions. In particular, one must implement special "non-reflecting" boundary conditions, which dissipate out-going waves as they exit the simulation. Unfortunately, the state of the art in non-reflecting boundary conditions (perfectly-matched layers, or PMLs) only permits trivially simple inflow/outflow conditions, so there is no reliable way to integrate a fluid simulation into a more complicated environment like a stormy ocean or a turbulent river. This paper introduces the first method for combining nonreflecting boundary conditions based on PMLs with inflow/outflow boundary conditions that vary arbitrarily throughout space and time. Our algorithm is a generalization of stateof- the-art mean-flow boundary conditions in the computational fluid dynamics literature, and it allows for seamless integration of a fluid simulation into much more complicated environments. Our method also opens the door for previously-unseen postprocess effects like retroactively changing the location of solid obstacles, and locally increasing the visual detail of a pre-existing simulation. acknowledged_ssus: - _id: ScienComp acknowledgement: 'We thank the IST Austria Visual Computing group for helpful feedback throughout the project. ' alternative_title: - ACM Transactions on Graphics article_number: '96' author: - first_name: Morten full_name: Bojsen-Hansen, Morten id: 439F0C8C-F248-11E8-B48F-1D18A9856A87 last_name: Bojsen-Hansen orcid: 0000-0002-4417-3224 - first_name: Christopher J full_name: Wojtan, Christopher J id: 3C61F1D2-F248-11E8-B48F-1D18A9856A87 last_name: Wojtan orcid: 0000-0001-6646-5546 citation: ama: 'Bojsen-Hansen M, Wojtan C. Generalized non-reflecting boundaries for fluid re-simulation. In: Vol 35. ACM; 2016. doi:10.1145/2897824.2925963' apa: 'Bojsen-Hansen, M., & Wojtan, C. (2016). Generalized non-reflecting boundaries for fluid re-simulation (Vol. 35). Presented at the ACM SIGGRAPH, Anaheim, CA, USA: ACM. https://doi.org/10.1145/2897824.2925963' chicago: Bojsen-Hansen, Morten, and Chris Wojtan. “Generalized Non-Reflecting Boundaries for Fluid Re-Simulation,” Vol. 35. ACM, 2016. https://doi.org/10.1145/2897824.2925963. 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. ista: Bojsen-Hansen M, Wojtan C. 2016. Generalized non-reflecting boundaries for fluid re-simulation. ACM SIGGRAPH, ACM Transactions on Graphics, vol. 35, 96. mla: Bojsen-Hansen, Morten, and Chris Wojtan. Generalized Non-Reflecting Boundaries for Fluid Re-Simulation. Vol. 35, no. 4, 96, ACM, 2016, doi:10.1145/2897824.2925963. short: M. Bojsen-Hansen, C. Wojtan, in:, ACM, 2016. conference: end_date: 2016-07-28 location: Anaheim, CA, USA name: ACM SIGGRAPH start_date: 2016-07-24 date_created: 2018-12-11T11:51:35Z date_published: 2016-07-11T00:00:00Z date_updated: 2023-02-21T10:36:12Z day: '11' ddc: - '000' department: - _id: ChWo doi: 10.1145/2897824.2925963 ec_funded: 1 file: - access_level: open_access checksum: 140b5532f0a2a006a0149cab7c73c17c content_type: application/pdf creator: system date_created: 2018-12-12T10:13:00Z date_updated: 2020-07-14T12:44:47Z file_id: '4981' file_name: IST-2016-631-v1+2_a96-bojsen-hansen.pdf file_size: 12422760 relation: main_file file_date_updated: 2020-07-14T12:44:47Z has_accepted_license: '1' intvolume: ' 35' issue: '4' language: - iso: eng month: '07' oa: 1 oa_version: Published Version project: - _id: 2533E772-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '638176' name: Efficient Simulation of Natural Phenomena at Extremely Large Scales publication_status: published publisher: ACM publist_id: '5879' pubrep_id: '631' quality_controlled: '1' status: public title: Generalized non-reflecting boundaries for fluid re-simulation tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: conference user_id: 4435EBFC-F248-11E8-B48F-1D18A9856A87 volume: 35 year: '2016' ... --- _id: '1361' abstract: - lang: eng text: We propose a novel surface-only technique for simulating incompressible, inviscid and uniform-density liquids with surface tension in three dimensions. The liquid surface is captured by a triangle mesh on which a Lagrangian velocity field is stored. Because advection of the velocity field may violate the incompressibility condition, we devise an orthogonal projection technique to remove the divergence while requiring the evaluation of only two boundary integrals. The forces of surface tension, gravity, and solid contact are all treated by a boundary element solve, allowing us to perform detailed simulations of a wide range of liquid phenomena, including waterbells, droplet and jet collisions, fluid chains, and crown splashes. alternative_title: - ACM Transactions on Graphics article_number: a78 author: - first_name: Fang full_name: Da, Fang last_name: Da - first_name: David full_name: Hahn, David id: 357A6A66-F248-11E8-B48F-1D18A9856A87 last_name: Hahn - first_name: Christopher full_name: Batty, Christopher last_name: Batty - first_name: Christopher J full_name: Wojtan, Christopher J id: 3C61F1D2-F248-11E8-B48F-1D18A9856A87 last_name: Wojtan orcid: 0000-0001-6646-5546 - first_name: Eitan full_name: Grinspun, Eitan last_name: Grinspun citation: ama: 'Da F, Hahn D, Batty C, Wojtan C, Grinspun E. Surface only liquids. In: Vol 35. ACM; 2016. doi:10.1145/2897824.2925899' apa: 'Da, F., Hahn, D., Batty, C., Wojtan, C., & Grinspun, E. (2016). Surface only liquids (Vol. 35). Presented at the ACM SIGGRAPH, Anaheim, CA, USA: ACM. https://doi.org/10.1145/2897824.2925899' chicago: Da, Fang, David Hahn, Christopher Batty, Chris Wojtan, and Eitan Grinspun. “Surface Only Liquids,” Vol. 35. ACM, 2016. https://doi.org/10.1145/2897824.2925899. ieee: F. Da, D. Hahn, C. Batty, C. Wojtan, and E. Grinspun, “Surface only liquids,” presented at the ACM SIGGRAPH, Anaheim, CA, USA, 2016, vol. 35, no. 4. ista: Da F, Hahn D, Batty C, Wojtan C, Grinspun E. 2016. Surface only liquids. ACM SIGGRAPH, ACM Transactions on Graphics, vol. 35, a78. mla: Da, Fang, et al. Surface Only Liquids. Vol. 35, no. 4, a78, ACM, 2016, doi:10.1145/2897824.2925899. short: F. Da, D. Hahn, C. Batty, C. Wojtan, E. Grinspun, in:, ACM, 2016. conference: end_date: 2016-07-28 location: Anaheim, CA, USA name: ACM SIGGRAPH start_date: 2016-07-24 date_created: 2018-12-11T11:51:35Z date_published: 2016-07-11T00:00:00Z date_updated: 2023-02-21T10:36:07Z day: '11' ddc: - '000' department: - _id: ChWo doi: 10.1145/2897824.2925899 ec_funded: 1 file: - access_level: open_access checksum: 6d662893bd447d4f575b4961a2247811 content_type: application/pdf creator: system date_created: 2018-12-12T10:08:01Z date_updated: 2020-07-14T12:44:46Z file_id: '4660' file_name: IST-2016-637-v1+1_2016_Da_SOL.pdf file_size: 10561865 relation: main_file file_date_updated: 2020-07-14T12:44:46Z has_accepted_license: '1' intvolume: ' 35' issue: '4' language: - iso: eng month: '07' oa: 1 oa_version: Published Version project: - _id: 2533E772-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '638176' name: Efficient Simulation of Natural Phenomena at Extremely Large Scales publication_status: published publisher: ACM publist_id: '5881' pubrep_id: '637' quality_controlled: '1' scopus_import: 1 status: public title: Surface only liquids type: conference user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87 volume: 35 year: '2016' ... --- _id: '1412' abstract: - lang: eng 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. acknowledgement: 'This research was supported by NSERC (RGPIN-04360-2014) and IST Austria. ' author: - first_name: Ryan full_name: Goldade, Ryan last_name: Goldade - first_name: Christopher full_name: Batty, Christopher last_name: Batty - first_name: Christopher J full_name: Wojtan, Christopher J id: 3C61F1D2-F248-11E8-B48F-1D18A9856A87 last_name: Wojtan orcid: 0000-0001-6646-5546 citation: ama: Goldade R, Batty C, Wojtan C. A practical method for high-resolution embedded liquid surfaces. Computer Graphics Forum. 2016;35(2):233-242. doi:10.1111/cgf.12826 apa: Goldade, R., Batty, C., & Wojtan, C. (2016). A practical method for high-resolution embedded liquid surfaces. Computer Graphics Forum. Wiley-Blackwell. https://doi.org/10.1111/cgf.12826 chicago: Goldade, Ryan, Christopher Batty, and Chris Wojtan. “A Practical Method for High-Resolution Embedded Liquid Surfaces.” Computer Graphics Forum. Wiley-Blackwell, 2016. https://doi.org/10.1111/cgf.12826. ieee: R. Goldade, C. Batty, and C. Wojtan, “A practical method for high-resolution embedded liquid surfaces,” Computer Graphics Forum, vol. 35, no. 2. Wiley-Blackwell, pp. 233–242, 2016. 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.” Computer Graphics Forum, vol. 35, no. 2, Wiley-Blackwell, 2016, pp. 233–42, doi:10.1111/cgf.12826. short: R. Goldade, C. Batty, C. Wojtan, Computer Graphics Forum 35 (2016) 233–242. date_created: 2018-12-11T11:51:52Z date_published: 2016-05-27T00:00:00Z date_updated: 2023-02-21T10:38:30Z day: '27' ddc: - '000' department: - _id: ChWo doi: 10.1111/cgf.12826 ec_funded: 1 file: - access_level: open_access checksum: 8e61387ee2e3bd0e776fbe301629bfd9 content_type: application/pdf creator: system date_created: 2018-12-12T10:13:18Z date_updated: 2020-07-14T12:44:53Z file_id: '5000' file_name: IST-2016-612-v1+2_Wojtan_APracticalMethod_PostPrint_2016.pdf file_size: 15873858 relation: main_file file_date_updated: 2020-07-14T12:44:53Z has_accepted_license: '1' intvolume: ' 35' issue: '2' language: - iso: eng month: '05' oa: 1 oa_version: Submitted Version page: 233 - 242 project: - _id: 2533E772-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '638176' name: Efficient Simulation of Natural Phenomena at Extremely Large Scales publication: Computer Graphics Forum publication_status: published publisher: Wiley-Blackwell publist_id: '5795' pubrep_id: '612' quality_controlled: '1' scopus_import: 1 status: public title: A practical method for high-resolution embedded liquid surfaces type: journal_article user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87 volume: 35 year: '2016' ... --- _id: '1413' abstract: - lang: eng text: This paper generalizes the well-known Diffusion Curves Images (DCI), which are composed of a set of Bezier curves with colors specified on either side. These colors are diffused as Laplace functions over the image domain, which results in smooth color gradients interrupted by the Bezier curves. Our new formulation allows for more color control away from the boundary, providing a similar expressive power as recent Bilaplace image models without introducing associated issues and computational costs. The new model is based on a special Laplace function blending and a new edge blur formulation. We demonstrate that given some user-defined boundary curves over an input raster image, fitting colors and edge blur from the image to the new model and subsequent editing and animation is equally convenient as with DCIs. Numerous examples and comparisons to DCIs are presented. author: - first_name: Stefan full_name: Jeschke, Stefan id: 44D6411A-F248-11E8-B48F-1D18A9856A87 last_name: Jeschke citation: ama: 'Jeschke S. Generalized diffusion curves: An improved vector representation for smooth-shaded images. Computer Graphics Forum. 2016;35(2):71-79. doi:10.1111/cgf.12812' apa: 'Jeschke, S. (2016). Generalized diffusion curves: An improved vector representation for smooth-shaded images. Computer Graphics Forum. Wiley-Blackwell. https://doi.org/10.1111/cgf.12812' chicago: 'Jeschke, Stefan. “Generalized Diffusion Curves: An Improved Vector Representation for Smooth-Shaded Images.” Computer Graphics Forum. Wiley-Blackwell, 2016. https://doi.org/10.1111/cgf.12812.' ieee: 'S. Jeschke, “Generalized diffusion curves: An improved vector representation for smooth-shaded images,” Computer Graphics Forum, vol. 35, no. 2. Wiley-Blackwell, pp. 71–79, 2016.' ista: 'Jeschke S. 2016. Generalized diffusion curves: An improved vector representation for smooth-shaded images. Computer Graphics Forum. 35(2), 71–79.' mla: 'Jeschke, Stefan. “Generalized Diffusion Curves: An Improved Vector Representation for Smooth-Shaded Images.” Computer Graphics Forum, vol. 35, no. 2, Wiley-Blackwell, 2016, pp. 71–79, doi:10.1111/cgf.12812.' short: S. Jeschke, Computer Graphics Forum 35 (2016) 71–79. date_created: 2018-12-11T11:51:53Z date_published: 2016-05-01T00:00:00Z date_updated: 2021-01-12T06:50:34Z day: '01' department: - _id: ChWo doi: 10.1111/cgf.12812 intvolume: ' 35' issue: '2' language: - iso: eng month: '05' oa_version: None page: 71 - 79 project: - _id: 25357BD2-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: P 24352-N23 name: 'Deep Pictures: Creating Visual and Haptic Vector Images' publication: Computer Graphics Forum publication_status: published publisher: Wiley-Blackwell publist_id: '5794' quality_controlled: '1' scopus_import: 1 status: public title: 'Generalized diffusion curves: An improved vector representation for smooth-shaded images' type: journal_article user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87 volume: 35 year: '2016' ... --- _id: '1415' abstract: - lang: eng text: The Fluid Implicit Particle method (FLIP) for liquid simulations uses particles to reduce numerical dissipation and provide important visual cues for events like complex splashes and small-scale features near the liquid surface. Unfortunately, FLIP simulations can be computationally expensive, because they require a dense sampling of particles to fill the entire liquid volume. Furthermore, the vast majority of these FLIP particles contribute nothing to the fluid's visual appearance, especially for larger volumes of liquid. We present a method that only uses FLIP particles within a narrow band of the liquid surface, while efficiently representing the remaining inner volume on a regular grid. We show that a naïve realization of this idea introduces unstable and uncontrollable energy fluctuations, and we propose a novel coupling scheme between FLIP particles and regular grid which overcomes this problem. Our method drastically reduces the particle count and simulation times while yielding results that are nearly indistinguishable from regular FLIP simulations. Our approach is easy to integrate into any existing FLIP implementation. author: - first_name: Florian full_name: Ferstl, Florian last_name: Ferstl - first_name: Ryoichi full_name: Ando, Ryoichi last_name: Ando - first_name: Christopher J full_name: Wojtan, Christopher J id: 3C61F1D2-F248-11E8-B48F-1D18A9856A87 last_name: Wojtan orcid: 0000-0001-6646-5546 - first_name: Rüdiger full_name: Westermann, Rüdiger last_name: Westermann - first_name: Nils full_name: Thuerey, Nils last_name: Thuerey citation: ama: Ferstl F, Ando R, Wojtan C, Westermann R, Thuerey N. Narrow band FLIP for liquid simulations. Computer Graphics Forum. 2016;35(2):225-232. doi:10.1111/cgf.12825 apa: Ferstl, F., Ando, R., Wojtan, C., Westermann, R., & Thuerey, N. (2016). Narrow band FLIP for liquid simulations. Computer Graphics Forum. Wiley-Blackwell. https://doi.org/10.1111/cgf.12825 chicago: Ferstl, Florian, Ryoichi Ando, Chris Wojtan, Rüdiger Westermann, and Nils Thuerey. “Narrow Band FLIP for Liquid Simulations.” Computer Graphics Forum. Wiley-Blackwell, 2016. https://doi.org/10.1111/cgf.12825. ieee: F. Ferstl, R. Ando, C. Wojtan, R. Westermann, and N. Thuerey, “Narrow band FLIP for liquid simulations,” Computer Graphics Forum, vol. 35, no. 2. Wiley-Blackwell, pp. 225–232, 2016. ista: Ferstl F, Ando R, Wojtan C, Westermann R, Thuerey N. 2016. Narrow band FLIP for liquid simulations. Computer Graphics Forum. 35(2), 225–232. mla: Ferstl, Florian, et al. “Narrow Band FLIP for Liquid Simulations.” Computer Graphics Forum, vol. 35, no. 2, Wiley-Blackwell, 2016, pp. 225–32, doi:10.1111/cgf.12825. short: F. Ferstl, R. Ando, C. Wojtan, R. Westermann, N. Thuerey, Computer Graphics Forum 35 (2016) 225–232. date_created: 2018-12-11T11:51:53Z date_published: 2016-05-01T00:00:00Z date_updated: 2023-02-21T10:38:38Z day: '01' ddc: - '000' department: - _id: ChWo doi: 10.1111/cgf.12825 file: - access_level: open_access checksum: 984afbe510ed48019025dff1dcc7baad content_type: application/pdf creator: system date_created: 2018-12-12T10:12:22Z date_updated: 2020-07-14T12:44:53Z file_id: '4940' file_name: IST-2016-611-v1+3_CW_nbflip_postprint_2016.pdf file_size: 5938324 relation: main_file file_date_updated: 2020-07-14T12:44:53Z has_accepted_license: '1' intvolume: ' 35' issue: '2' language: - iso: eng month: '05' oa: 1 oa_version: Submitted Version page: 225 - 232 publication: Computer Graphics Forum publication_status: published publisher: Wiley-Blackwell publist_id: '5793' pubrep_id: '611' quality_controlled: '1' scopus_import: 1 status: public title: Narrow band FLIP for liquid simulations type: journal_article user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87 volume: 35 year: '2016' ... --- _id: '1362' abstract: - lang: eng text: We present a boundary element based method for fast simulation of brittle fracture. By introducing simplifying assumptions that allow us to quickly estimate stress intensities and opening displacements during crack propagation, we build a fracture algorithm where the cost of each time step scales linearly with the length of the crackfront. The transition from a full boundary element method to our faster variant is possible at the beginning of any time step. This allows us to build a hybrid method, which uses the expensive but more accurate BEM while the number of degrees of freedom is low, and uses the fast method once that number exceeds a given threshold as the crack geometry becomes more complicated. Furthermore, we integrate this fracture simulation with a standard rigid-body solver. Our rigid-body coupling solves a Neumann boundary value problem by carefully separating translational, rotational and deformational components of the collision forces and then applying a Tikhonov regularizer to the resulting linear system. We show that our method produces physically reasonable results in standard test cases and is capable of dealing with complex scenes faster than previous finite- or boundary element approaches. alternative_title: - ACM Transactions on Graphics article_number: '104' author: - first_name: David full_name: Hahn, David id: 357A6A66-F248-11E8-B48F-1D18A9856A87 last_name: Hahn - first_name: Christopher J full_name: Wojtan, Christopher J id: 3C61F1D2-F248-11E8-B48F-1D18A9856A87 last_name: Wojtan orcid: 0000-0001-6646-5546 citation: ama: 'Hahn D, Wojtan C. Fast approximations for boundary element based brittle fracture simulation. In: Vol 35. ACM; 2016. doi:10.1145/2897824.2925902' apa: 'Hahn, D., & Wojtan, C. (2016). Fast approximations for boundary element based brittle fracture simulation (Vol. 35). Presented at the ACM SIGGRAPH, Anaheim, CA, USA: ACM. https://doi.org/10.1145/2897824.2925902' chicago: Hahn, David, and Chris Wojtan. “Fast Approximations for Boundary Element Based Brittle Fracture Simulation,” Vol. 35. ACM, 2016. https://doi.org/10.1145/2897824.2925902. ieee: D. Hahn and C. Wojtan, “Fast approximations for boundary element based brittle fracture simulation,” presented at the ACM SIGGRAPH, Anaheim, CA, USA, 2016, vol. 35, no. 4. ista: Hahn D, Wojtan C. 2016. Fast approximations for boundary element based brittle fracture simulation. ACM SIGGRAPH, ACM Transactions on Graphics, vol. 35, 104. mla: Hahn, David, and Chris Wojtan. Fast Approximations for Boundary Element Based Brittle Fracture Simulation. Vol. 35, no. 4, 104, ACM, 2016, doi:10.1145/2897824.2925902. short: D. Hahn, C. Wojtan, in:, ACM, 2016. conference: end_date: 2016-07-28 location: Anaheim, CA, USA name: ACM SIGGRAPH start_date: 2016-07-24 date_created: 2018-12-11T11:51:35Z date_published: 2016-07-01T00:00:00Z date_updated: 2023-09-07T12:02:56Z day: '01' ddc: - '000' department: - _id: ChWo doi: 10.1145/2897824.2925902 ec_funded: 1 file: - access_level: open_access checksum: 943712d9c9dc8bb5048d4adc561d7d38 content_type: application/pdf creator: system date_created: 2018-12-12T10:15:04Z date_updated: 2020-07-14T12:44:46Z file_id: '5121' file_name: IST-2016-632-v1+2_a104-hahn.pdf file_size: 12453704 relation: main_file file_date_updated: 2020-07-14T12:44:46Z has_accepted_license: '1' intvolume: ' 35' issue: '4' language: - iso: eng month: '07' oa: 1 oa_version: Published Version project: - _id: 2533E772-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '638176' name: Efficient Simulation of Natural Phenomena at Extremely Large Scales publication_status: published publisher: ACM publist_id: '5880' pubrep_id: '632' quality_controlled: '1' related_material: record: - id: '839' relation: dissertation_contains status: public status: public title: Fast approximations for boundary element based brittle fracture simulation tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: conference user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87 volume: 35 year: '2016' ... --- _id: '1122' abstract: - lang: eng text: "Computer graphics is an extremely exciting field for two reasons. On the one hand,\r\nthere is a healthy injection of pragmatism coming from the visual effects industry\r\nthat want robust algorithms that work so they can produce results at an increasingly\r\nfrantic pace. On the other hand, they must always try to push the envelope and\r\nachieve the impossible to wow their audiences in the next blockbuster, which means\r\nthat the industry has not succumb to conservatism, and there is plenty of room to\r\ntry out new and crazy ideas if there is a chance that it will pan into something\r\nuseful.\r\nWater simulation has been in visual effects for decades, however it still remains\r\nextremely challenging because of its high computational cost and difficult artdirectability.\r\nThe work in this thesis tries to address some of these difficulties.\r\nSpecifically, we make the following three novel contributions to the state-of-the-art\r\nin water simulation for visual effects.\r\nFirst, we develop the first algorithm that can convert any sequence of closed\r\nsurfaces in time into a moving triangle mesh. State-of-the-art methods at the time\r\ncould only handle surfaces with fixed connectivity, but we are the first to be able to\r\nhandle surfaces that merge and split apart. This is important for water simulation\r\npractitioners, because it allows them to convert splashy water surfaces extracted\r\nfrom particles or simulated using grid-based level sets into triangle meshes that can\r\nbe either textured and enhanced with extra surface dynamics as a post-process.\r\nWe also apply our algorithm to other phenomena that merge and split apart, such\r\nas morphs and noisy reconstructions of human performances.\r\nSecond, we formulate a surface-based energy that measures the deviation of a\r\nwater surface froma physically valid state. Such discrepancies arise when there is a\r\nmismatch in the degrees of freedom between the water surface and the underlying\r\nphysics solver. This commonly happens when practitioners use a moving triangle\r\nmesh with a grid-based physics solver, or when high-resolution grid-based surfaces\r\nare combined with low-resolution physics. Following the direction of steepest\r\ndescent on our surface-based energy, we can either smooth these artifacts or turn\r\nthem into high-resolution waves by interpreting the energy as a physical potential.\r\nThird, we extend state-of-the-art techniques in non-reflecting boundaries to handle spatially and time-varying background flows. This allows a novel new\r\nworkflow where practitioners can re-simulate part of an existing simulation, such\r\nas removing a solid obstacle, adding a new splash or locally changing the resolution.\r\nSuch changes can easily lead to new waves in the re-simulated region that would\r\nreflect off of the new simulation boundary, effectively ruining the illusion of a\r\nseamless simulation boundary between the existing and new simulations. Our\r\nnon-reflecting boundaries makes sure that such waves are absorbed." acknowledgement: "First and foremost I would like to thank Chris. I have been incredibly lucky to have\r\nyou as my advisor. Your integrity and aspiration to do the right thing in all walks of\r\nlife is something I admire and aspire to. I also really appreciate the fact that when\r\nworking with you it felt like we were equals. I think we had a very synergetic work\r\nrelationship: I learned immensely from you, but I dare say that you learned a few\r\nthings from me as well. ;)\r\nNext, I would like to thank my amazing committee. Hao, it was a fantastic\r\nexperience working with you. You showed me how to persevere and keep morale\r\nhigh when things were looking the most bleak before the deadline. You are an\r\nincredible motivator and super fun to be around! Vladimir, thanks for the shared\r\nlunches and the poker games. Sorry for not bringing them back when I got busy.\r\nAlso, sorry for embarrassing you by asking about your guitar playing that one\r\ntime. You really are quite awesome! Nils, one of the friendliest and most humble\r\npeople you will meet and a top notch researcher to boot! Thank you for joining\r\nmy committee late!\r\nI would also like to acknowledge the Visual Computing group at IST Austria\r\nfrom whom I have learned so much. The excellent discussions we had in reading\r\ngroups and research meetings really helped me become a better researcher!\r\nNext, I would like to thank all the amazing people that I met during my PhD\r\nstudies, both at IST Austria, in Vienna and elsewhere. " alternative_title: - ISTA Thesis article_processing_charge: No author: - first_name: Morten full_name: Bojsen-Hansen, Morten id: 439F0C8C-F248-11E8-B48F-1D18A9856A87 last_name: Bojsen-Hansen orcid: 0000-0002-4417-3224 citation: ama: Bojsen-Hansen M. Tracking, correcting and absorbing water surface waves. 2016. doi:10.15479/AT:ISTA:th_640 apa: Bojsen-Hansen, M. (2016). Tracking, correcting and absorbing water surface waves. Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:th_640 chicago: Bojsen-Hansen, Morten. “Tracking, Correcting and Absorbing Water Surface Waves.” Institute of Science and Technology Austria, 2016. https://doi.org/10.15479/AT:ISTA:th_640. ieee: M. Bojsen-Hansen, “Tracking, correcting and absorbing water surface waves,” Institute of Science and Technology Austria, 2016. ista: Bojsen-Hansen M. 2016. Tracking, correcting and absorbing water surface waves. Institute of Science and Technology Austria. mla: Bojsen-Hansen, Morten. Tracking, Correcting and Absorbing Water Surface Waves. Institute of Science and Technology Austria, 2016, doi:10.15479/AT:ISTA:th_640. short: M. Bojsen-Hansen, Tracking, Correcting and Absorbing Water Surface Waves, Institute of Science and Technology Austria, 2016. date_created: 2018-12-11T11:50:16Z date_published: 2016-07-15T00:00:00Z date_updated: 2024-02-21T13:50:48Z day: '15' ddc: - '004' - '005' - '006' - '532' - '621' degree_awarded: PhD department: - _id: ChWo doi: 10.15479/AT:ISTA:th_640 file: - access_level: open_access content_type: application/pdf creator: system date_created: 2018-12-12T10:13:02Z date_updated: 2018-12-12T10:13:02Z file_id: '4982' file_name: IST-2016-640-v1+1_2016_Bojsen-Hansen_TCaAWSW.pdf file_size: 13869345 relation: main_file file_date_updated: 2018-12-12T10:13:02Z has_accepted_license: '1' language: - iso: eng month: '07' oa: 1 oa_version: Published Version page: '114' publication_identifier: issn: - 2663-337X publication_status: published publisher: Institute of Science and Technology Austria publist_id: '6238' related_material: record: - id: '5558' relation: other status: public status: public supervisor: - first_name: Christopher J full_name: Wojtan, Christopher J id: 3C61F1D2-F248-11E8-B48F-1D18A9856A87 last_name: Wojtan orcid: 0000-0001-6646-5546 title: Tracking, correcting and absorbing water surface waves tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: dissertation user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 year: '2016' ...