perf(rvu, rpict, rtrace, rcontrib): Better rendering of spectral primitives in RGB mode
fix(rpict,rtrace,rvu): Fixed issue with ambvalOK()
feat(rpict,rtrace,rcontrib,rtpict): Hyperspectral rendering (except photon map)
fix: minor improvement to ambient value checks
Stripped out code related to old (pre-Hessian) ambient calculation
Created independent ambient file pointer to resolve some race issues
Replaced fread() & fwrite() calls with more efficient replacements
Minor changes should not affect behavior
Officially replaced ambient calculation with new Hessian-based error control
Added "corral" flags to prevent light leaks in new calculation (-DNEWAMB)
Fixed floating-point errors due to use of float where double needed
Partial implementation of Hessian gradient calculation (-DNEWAMB)
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
added check for ambient value validity, ambvalOK(), called by readambval()
added header and magic number to ambient value file
Initial revision
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