This is a first try at getting some ambient occlusion working in the raytracer. This round the occlusion is very simple. Each pixel multiple samples are taken out into the scene in a hemisphere around the normal. The more pixels hit occluders, the more occluded that pixel is. This gives those nice, diffuse shadows when objects are close to each other (look at the orange ball in the area facing towards the blue ball).
This occlusion will need a lot more work. Even with 256 samples the occlusions comes out blotchy. It is also really slow. There's a lot of ways to make this happen faster and come out with a smoother, better result. But, it isn't bad for a first try.
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