Comments
I thought it'd be cool to render a sphere pyramid thing, so I did that! Diffuse interreflection didn't add too much to the scene so turned that off, also high wasn't noticeable - this is rendered at D=5.
Raytraced Scene

I thought it'd be cool to render a sphere pyramid thing, so I did that! Diffuse interreflection didn't add too much to the scene so turned that off, also high wasn't noticeable - this is rendered at D=5.