feat: Added new WGMDfunc programmable material
Minor optimization should not affect behavior
Moved findmaterial() from source.c to initotypes.c
Made proximity test (plugaleak) more robust with transparent surfaces, etc.
Added isopaque() macro to otspecial.h
Created a source occluder cache to accelerate shadow testing.
Broke standard.h into rtio.h, rterror.h, rtmath.h, and rtmisc.h
Instrumented headers against multiple inclusion and for use from C++. Removed NOPROTO sections.
Replaced inline copyright notice with #include "copyright.h"
Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release
updated revision number for release 2.0
Initial revision
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