hi guys, I'm back Well, this will be documented soon and some examples up to come but for now here's the way to use the brand new SPS feature : particle intersections ! You need first to activate this feature explicitly when creating your SPS (not enabled by default because it uses more memory and more RAM) with the optional parameter particleIntersection : var sps = new SolidParticleSystem("sps", scene, {particleIntersection: true}); This is a method ot the class SolidParticle