Minor improvements to direct specular sampling
Fixes for Windows and bug fix in bsdf_m.c
Stratified specular sampling with -ss > 1
Fixed comments and potential bug in BSDF tree traversal
Partial implementation of variable-resolution BSDFs
Fixed interface for determining BSDF solid angles
Final fix to Klems angles -- I hope
Fixed issue with coordinate orientation for front transmission
Corrected notion of "front" and "back" to coincide with surface normals
Fixes to BSDF including blurring of angle boundaries
Minor changes and fixes -- first working version of BSDF material
Minor fixes and adjustments
Major code reorg, moving mgflib to common and introducing BSDF material
Working version of genBSDF with detail geometry support in mkillum
Added #ifdef for inclusion
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