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Anisotropic Elasticity for Inversion-Safety and Element Rehabilitation Theodore Kim, Fernando de Goes, Hayley Iben July 2019 We present an analysis of anisotropic hyperelasticity, specifically transverse isotropy, that obtains closed-form expressions for the eigendecompositions of many common energies. We then use these to build fast and concise Newton implementations. We leverage our analysis in two separate applications. First, we show that existing anisotropic energies are not inversion-safe, ... more Paper (PDF) Video Additional materials: [Anisotropy2019_supplement.pdf], [matlab.zip] |
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Holding the Shape in Hair Simulation Hayley Iben, Jacob Brooks, Christopher Bolwyn July 2019 Hair simulation models are based on physics, but require additional controls to achieve certain looks or art directions. A common simulation control is to use hard or soft constraints on the kinematic points provided by the articulation of the scalp or explicit rigging of the hair [Kaur et al. 2018; ... more Paper (PDF) Video |
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Artistic Simulation of Curly Hair Hayley Iben, Mark Meyer, Lena Petrovic, Olivier Soares, John Anderson, Andrew Witkin July 2013 Artistic simulation of hair presents many challenges - ranging from incorporating artistic control to dealing with extreme motions of characters. Additionally, in a production environment, the simulation needs to be fast and results need to be usable "out of the box" (without extensive parameter modifications) in order to produce ... more Paper (PDF) Additional materials: [tazVideo-SCA.mov] Available in the Proceedings of the Symposium on Computer Animation 2013. Available as Pixar Technical Memo #12-03b Other versions: |