Added a part of the preprocessing algorithm to the pathtracer for now while testing.
Added a part of the preprocessing algorithm to the pathtracer for now while testing.

- generate random points on the triangles of the scene
- chose a subset of those with best candidate sampling
- triangulate the disks around the points

Wyk3d/YafaRay,Wyk3d/YafaRay,Wyk3d/YafaRay