On: John Carmack's Comment on Hardware Ray Tracing

[ohwp]

I think path tracing is one of the most promising methods for realtime ray tracing.

Brigade is one example: http://igad.nhtv.nl/~bikker/ Here an in-game example: http://www.youtube.com/watch?v=6_DrgiwLABk

And a nice blog with posts about Brigade, Octane and others: http://raytracey.blogspot.nl/