Efficient elasticity for character skinning

摘要

A novel algorithmic framework is presented for the simulation of hyperelastic soft tissues that drastically improves each aspect discussed above compared to existing techniques. The approach is robust to large deformation (even inverted configurations) and extremely stable by virtue of careful treatment of linearization. Additionally, a new multigrid approach is presented to efficiently support hundreds of thousands of degrees of freedom (rather than the few thousands typical of existing techniques) in a production environment. Furthermore, these performance and robustness improvements are guaranteed in the presence of both collision and quasistatic/implicit time stepping techniques. The result is a significant advance in the applicability of hyperelastic simulation to skeleton driven character skinning.

主权项

1. A method for deforming computer-generated objects, the method comprising:
receiving, at one or more computer systems, information identifying a first computer-generated object; receiving, at the one or more computer systems, information identifying a hexahedral grid; receiving, at the one or more computer systems, information identifying a set of material properties; receiving, at the one or more computer systems, kinematic information associated with a second computer-generated object; determining, with one or more processors associated with the one or more computer systems, response of a continuum representation of a material at one or more cells of the hexahedral grid embedding the second object according to the set of material properties and the kinematic information associated with the second object based on a stabilized energy discretization over the one or more cells of the hexahedral grid utilizing a one point quadrature at each of the one or more cells, wherein the one point quadrature is stabilized according to an integration rule applied to a portion of an energy density function; generating, with the one or more processors associated with the one or more computer systems, information configured to deform the first object from a first configuration to a second configuration based on the determined response of the continuum representation of the material; and storing the information configured to deform the first object from the first configuration to the second configuration in a storage device associated with the one or more computer systems.