Added epsilon back to normalize() test
Wrote closestapproach() function to find closest point for two rays
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
modest efficiency improvements
changed static variables to register
added first order approximation for sqrt() to normalize()
Removed problematic math function declarations
updated revision number for release 2.0
added FLOAT definition to better control size of structures
improved efficiency of spinvector() slightly
added spinvector()
added fvsum() to compute v0+f*v1
changed length test to absolute zero
removed conditional code from normalize()
Initial revision
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