Sauerbraten Fork - New Particle System - Geometry Collision 

github.com/sau...
The new particle system of Sauerbraten Fork now let particles collide with the geometry. Because sauerbraten's geometry is based on an octree the collision calculation is cheap. This scene shows 10000 particles colliding while modifing the geometry.
Used components:
* Point Emitter
* Geometry Collision Modifier
* Global Gravity Modifier
* Billboard Renderer