perf: Adjustment to source spread in lobe speculars that accounts for -dj
fix: Issue with textured surfaces and source scattering
perf: Further minor tweaks
perf: Minor tweaks
feat: Added setting of RdotP, NxP, NyP, and NzP variables
fix: Dangerous typo!
fix: Was over-estimating diffuse reflection with Fresnel effect
perf: Optimized initialization order for early shadow testing
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