In this tutorial we create a component which can detect when objects are on top of each other (colliding). This works for any 2D input with alpha. You could also render a 3D scene and use it there, it just works on the u v axis though.
Hi there, I've made a new example how to build a particle system using a compute shader in TouchDesigner. This one is based on instancing and uses a heightmap for the particle to collide with. I tried to explain everything as much as possible using little textDATs docked to most components.