> It looks rather like the noise you get from a lower-end digital camera, which actually rather enhances the realism for me. That's the advantage of ray tracin

> It looks rather like the noise you get from a lower-end digital camera, which actually rather enhances the realism for me. That's the advantage of ray tracing: you're simulating physical reality, so any errors emulate physical reality as well. In the case of noise, it's simply the result of each pixel not having sufficient sampling depth, because the ray tracing algorithm hasn't been run long enough. This is exactly the same as when it happens with a camera: if you opened the shutter for a longer time period, the noise would go away (although you might not be able to hold the camera still).