A particle system using CSG for description and visualization

We present a method to describe and visualize particle-systems using constructive solid geometry (CSG). Deformable objects simulations are easy to realize with coupled-particles. Motions are the results of time-integration of physical dynamics equations. In order to describe the physical objects, we add to the classic CSG-attributes, some that are not graphical. They allow the definition of physical parameters (density, speed, ...). So the scene can be describe with only CSG-trees. When images are generated, the CSG-tree is used by a ray-tracer. We can control a large range of objects with very different behaviours. In order to integrate the two models (particles, CSG) in one system, we propose methods that allow to convert a model from one to another