Some of the hardware was built (one of the projectors), some of it is purchased (a second projector due to time constraints, and all of the DACs). The games, graphic engine, DAC comms, etc. are all programmed in a mix of Python and C++. Most projection software available is commercial and expensive, so I've rolled my own stack.

I'm working towards surface distortion mapping, which is increasingly important in the umbrella concern of rectifying multiple projectors onto a single coplanar/colinear surface. I'm going to project a series of grids and have OpenCV automatically align all of the projectors. From there I'll be working with a logical "frame buffer" (really coordinate/transform buffer) that is relayed over the network to a graphics server that will dispatch the drawing jobs and topologically sort objects unless they have preassigned projector-affinity.

As far as I know, nobody else is building a beowulf cluster of laser projectors for interactive display. That's my endgame. Really fluid, bright, fast laser light with incredible geometric output capacity. It won't be limited to 2D if I can get design a decent wireframe or clipping/culling engine.