What: Approximating global illumination using bouncing raycasts and particles
Why: Oh, you know. For fun…
It’s much more convincing and interesting when you can fly through the scene, so give the Webplayer a go.
Webplayer: http://bit.ly/visiblelight
For better performance, you can download Standalone builds from the bottom of the Webplayer page.
Vertex-lit
At 50k particles
At 88k particles
Another angle