CBox Unbiased Truck

I've modified the scene in the Kajiya path tracer a bit more: it now consists of a Cornell Box out of axis aligned boxes with the (in)famous truck from Unbiased Truck Soccer:

Color bleeding from the red and green wall:

The screenshots were rendered with 8600M GT (6 fps default view). On a GTS 450, the demo runs at 70 fps in default view. It should run at >200 fps on a GTX 580 with 8 samples per pixel. This new path tracer is just incredible fun, I can't stop messing with it.

Executable and source code at http://code.google.com/p/tokap-the-once-known-as-pong/downloads/list

UPDATE: a more challenging lighting set up with an open box only illuminated by the sky:

The truck seen from behind, indirectly lit by skylight bounced off the back and side walls. As expected with standard path tracing, the noise is a lot worse in this scenario. Bidirectional path tracing should converge faster using fewer samples.