Create MPM simulations

The material point method (MPM) is a numerical method used to simulate a wide variety of substances, like snow, sand, gel, rubber, and cloth. All these materials use the same simulate_mpm node, so they can be combined and interact with each other in the same simulation.

MPM can also be used to simulate fluids and fibers, but these are still experimental in Bifrost — feel free to try them if you are adventurous!