You can make particle objects collide rather than pass through polygonal or NURBS surfaces. Either or both objects can be moving at the moment of collision. Particles cannot collide with other particles. You can use the Dynamic Relationships Editor to reassign collisions between particles and rigid bodies or soft bodies. You can also use the Particle Collision Event Editor to make particles split, emit new particles, die, or run a MEL script when they collide with geometry.

• Make particles collide with a surface
• Edit particle collision attributes
• Duplicate collision effects
• Create particle collision events