Interactive Particles in 3D with TouchDesigner

Making 3D particle systems is pretty easy, and making interactive particle systems in 2D is pretty straightforward, but how can we make 3d particle systems that are still interactive?

In this tutorial, I explore a simple method for 3d particle interaction using render picking on a single piece of geometry that I then use to interact with a large particle system.

Topics covered in this tutorial
* Particle Instancing
* Render Picking
* Interactive Touch and Mouse input
* Generating simple UV maps with the GLSL TOP