Blender Git Loki

Bugfix #4647

The raytracer wasn't calling node shaders yet, so results showed only
shading for the base material.
This now works, but there's a conflict in the internal Blender shader that
makes recursive raytracing with nodes unpredictable. Basicaly the conflict
is that when a ray wants to shade a point, it should be able to check the
material for mirror properties, but this is undefined for node trees...

Probably we need to separate raytrace entirely from material shading. Is
a good topic for NodeShader 2.0, when we really split up materials in
shading components.

I'll add a note in the release log about this. Best results you get now
when you don't include mirror/ray-transp insde a node tree, in that case
a regular material mirror can render that material perfectly.