Instrumented headers against multiple inclusion and for use from C++. Moved includes in headers out of "C" scope.
Replaced most outdated BSD function calls with their posix equivalents, and cleaned up a few other platform dependencies.
Broke standard.h into rtio.h, rterror.h, rtmath.h, and rtmisc.h
Abstracted process and path handling for Windows. Renamed FLOAT to RREAL because of conflict on Windows. Added conditional compiles for some signal handlers.
Various small changes to reduce compile warnings/errors on Windows.
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Changed (char *) casts for memory copies to (void *) and other fixes
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
removed memcpy() declaration
portability improvements
updated revision number for release 2.0
added FLOAT definition for vectors and matrices
changed setident4() into a macro
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