The video accompanying SIGGRAPH ASIA 2014 research paper by Rodolphe Vaillant(1,2), Gaël Guennebaud(3), Loïc Barthe(1), Brian Wyvill(2), Marie-Paule Cani(4): “Robust Iso-Surface Tracking for Interactive Charater Skinning”
Paper abstract:
We present a novel approach for interactive character skinning, which takes advantage of the best features of the recent implicit skinning method, and make it robust to extreme character movements, such as those involving contacts between different parts of the skin and sharp bending angles at joints. While keeping the basic idea of implicit skinning, namely approximate the character at each animation step by a 3D scalar field in which mesh-vertices are appropriately re-projected, we depart from the processing pipeline used so far. 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. Achieving this requires solving two challenging problems: 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, but also insure that the skin comes back to its rest shape when the character comes back to rest. Our solutions to these problems include: new composition operators enabling the combination of blending effects with local self-contact between implicit surfaces, and a tangential relaxation scheme derived from the as-rigid-as possible energy to solve the tracking problem.The result is a very robust interactive system that can handle contacts in a way that is visually plausible, exhibits the global effect of skin elasticity (sliding), and is suitable for use in a production pipeline.
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