perf: Removed unnecessary randomization in call to getperpendicular()
fix: Improved tracking of reflected vs. transmitted rays for antimatter
feat(rpict,rtrace,rcontrib,rtpict): Hyperspectral rendering (except photon map)
Had to reinstate ambRayInPmap() macro to avoid over-counting bug
Made axis randomization optional in getperpendicular()
Improved behavior of anisotropic reflections
Eliminated a number of minor warnings (all innocuous)
Bug fixes in Ashikhmin-Shirley and code cleanup
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