Efficient Simulation of Secondary Motion in Rig-Space

Abstract

We present an efficient method for augmenting keyframed charac- ter animations with physically-simulated secondary motion. Our method achieves a performance improvement of one to two orders of magnitude over previous work without compromising on qual- ity. This performance is based on a linearized formulation of rig- space dynamics that uses only rig parameters as degrees of free- dom, a physics-based volumetric skinning method that allows our method to predict the motion of internal vertices solely from de- formations of the surface, as well as a deferred Jacobian update scheme that drastically reduces the number of required rig evalua- tions. We demonstrate the performance of our method by compar- ing it to previous work and showcase its potential on a production- quality character rig.