Fix -Wall warnings.
Added Ri*Filter().
Fix double free.
Cleanup confusing Quadric internal function names.
Clean up.
Lights are Shaders.
Scene can have a background shader.
More test Geometry.
make Rt-clean, etc.
More test Geometry.
Distinguish between Geometry and Primitives.
Use Geometry::rnd().
Typo.
begin(), end().
Handle subgeometry xforms in CSG.
Cleanup.
Renamed Color to color.
RtFloat to scalar.
Vector to vector.
Typo.