Tools for multi-material simulations

This work was performed by Dr. Nick Hockings from CSIRO and aiming at making the design of scenes easier with partitioned meshes, especially for in multi-material finite-element simulations. SOFA allows the simulation of objects with parts composed of different materials, with different stiffnesses. These require partitioned tetrahedral meshes, such that groups of elements within a single mesh, can be assigned different properties.