With all the excitement with what Nvidia is doing, I thought I'd share this app I wrote a couple years ago.

This is a real time ray tracer for iPhones. Complete with global illumination, multiple material effects, and ability to customize and reposition the scene, all running real time at 30 FPS.

iTunes Download Link: https://itunes.apple.com/us/app/real-time-path-tracer/id1090...

Source is here: https://github.com/drewying/PathTracer-iOS