Thanks to the latest material point method (MPM) technology created by UCLA Animators, Alexey Stomakhin, Craig Schroeder, Lawrence Chai, Joseph Teran and Andrew Sell, Disney has been able to simulate an incredible realistic snowy environment in its latest animation comedy, Frozen. The following video was presented at the computer graphics conference Siggpath and explains the mathematics (utilizing a user controllable elasto-plastic constitutive model integrated with a hybrid Eulerian/Lagrangian Material Point Method) involved behind the snow simulation and dynamics used in the film. Watch the below video for various realistic simulations of the "snow" in action.
Read more about the film here.
UCLA Today article.