Sol-R
Open-source CUDA/OpenCL speed of light ray-tracer
...Most of the code does not rely on any literature about ray-tracing, but more on a naive approach of what rays could be used for. The idea was not to produce a physically based ray-tracer, but a simple engine that could produce cool images interactively. Take it for what it is! Sol-R is a lot of fun to play with if you like coding computer-generated images.