EXPERIMENTAL is not documented, behavior is not tested neither.

I've noticed the `EXPERIMENTAL` environment variable to be used here: https://github.com/NVIDIAGameWorks/kaolin/blob/master/kaolin/csrc/render/spc/raytrace_cuda.cu#L22-L26

However this environment variable is not documented anywhere, also this is not tested since it would require to re-build Kaolin with / without the environment variable. We should probably change that. 