|indices||List to be populated with virtual particle indices.|
Get list of indices to be used when generating virtual particles.
Virtual particles provide more robust and accurate collision handling against collision spheres and capsules. More virtual particles will generally increase the accuracy of collision handling, and thus a sufficient number of virtual particles can mimic triangle-based collision handling. Virtual particles are specified as barycentric interpolation of real particles: The position of a virtual particle is w0 * P0 + w1 * P1 + w2 * P2, where P1, P2, P3 real particle positions. The barycentric weights w0, w1, w2 are stored in a separate table so they can be shared across multiple virtual particles.