Follow the link in this post to download. There's some new features + performance increase. Rename cudart.dll to cudart32_31_9.dll to make it work.
The next image demonstrates some of the exceptional strenghts of using path tracing:
- indirect lighting with color bleeding: notice that every surface facing down (yellow arrows) picks up a slightly greenish glow from the floor plane, due to indirect light bouncing off (this picture uses path trace depth 6)
- soft shadows
- indirect shadows
- contact shadows (ambient occlusion)
- superb anti-aliasing
- depth of field
- natural looking light with gradual changes
all of these contribute to the photorealistic look and it's all interactive (on high end cpu+gpu)!