The snow is dancing... in the same time, the Stanford bunny is being distorted by a vortex flow. This example shows the combination of a particle system (the snow) and an object represented by a particle level set (the deforming bunny).

Real-Time Particle Systems, 2009

Flow volumes can be represented as the inside of a level set function. This work demonstrates that the particle level set method can be adapted to volumetric dye advection via streak volumes, and to the visualization by time surfaces and path volumes.

The Stanford bunny is subject to a local deformation that resembles clay modeling: by moving the sphere-shape emitter onto the bunny, a portion of the volume escapes around the sphere. The particle level set representation avoids the loss of material.