improve coordinate transforms for arbitrarygeometry #2
Description
I believe this part of the ArbitraryGeometry code should be rewritten.
- For the UV -> XYZ path, we should just probe vertically down. This should speed up uv2xyz calls by quite a bit
- To improve the XYZ -> UV path and not return NaNs as often, we should use a custom
osgUtil::PolytopeIntersectorinstead of the line intersectors in all directions, and implement finding the closest point if the polytope intersects.