Robust iso-surface tracking for interactive character skinning

Rodolphe Vaillant 1, 2 Gaël Guennebaud 3, 4 Loïc Barthe 2 Brian Wyvill 1 Marie-Paule Cani 5
3 MANAO - Melting the frontiers between Light, Shape and Matter
LaBRI - Laboratoire Bordelais de Recherche en Informatique, Inria Bordeaux - Sud-Ouest, LP2N - Laboratoire Photonique, Numérique et Nanosciences
5 IMAGINE - Intuitive Modeling and Animation for Interactive Graphics & Narrative Environments
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, INPG - Institut National Polytechnique de Grenoble
Abstract : We present a novel approach to interactive character skinning, which is robust to extreme character movements, handles skin contacts and produces the effect of skin elasticity (sliding). Our approach builds on the idea of implicit skinning in which the character is approximated by a 3D scalar field and mesh-vertices are appropriately re-projected. Instead of being bound by an initial skinning solution used to initialize the shape at each time step, we use the skin mesh to directly track iso-surfaces of the field over time. Technical problems are two-fold: firstly, all contact surfaces generated between skin parts should be captured as iso-surfaces of the implicit field; secondly, the tracking method should capture elastic skin effects when the joints bend, and as the character returns to its rest shape, so the skin must follow. Our solutions include: new composition operators enabling blending effects and local self-contact between implicit surfaces, as well as a tangential relaxation scheme derived from the as-rigid-as possible energy to solve the tracking problem.
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Submitted on : Tuesday, December 9, 2014 - 9:20:03 AM
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Rodolphe Vaillant, Gaël Guennebaud, Loïc Barthe, Brian Wyvill, Marie-Paule Cani. Robust iso-surface tracking for interactive character skinning. ACM Transactions on Graphics, Association for Computing Machinery, 2014, Proceedings of ACM SIGGRAPH ASIA 2014, 33 (6), pp.1 - 11. ⟨10.1145/2661229.2661264⟩. ⟨hal-01091820v2⟩



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