Included with the Extension for Autodesk 3ds Max 2013 are the following modifiers for use in Particle Flow simulations:
PFlow Collision Shape is a world-space modifier (WSM) that enables standard mesh objects to participate as particle deflectors in the MassFX simulation. Usage is straightforward: Apply the modifier to all objects that should deflect particles, and then add the modified objects as deflectors to a.
Particle Face Creator is an object-space modifier that uses particle positions to hide and reveal mesh geometry. As particles move past the geometry, parts of it melt away and then reappear in a natural-looking sequence. This is a result of the modifier's ability to adjust the geometry in a way that obscures the underlying face topology.
The Particle Skinner modifier allows one or more PFlow particle systems to deform the geometry of the modified object.