Modernized tone-mapping routines with structure pointer r.t. stack
Ansification and prototypes.
Instrumented headers against multiple inclusion and for use from C++. Moved includes in headers out of "C" scope.
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
fixed redrawing of local objects in OpenGL driver
changed dobj_render() to return the number of objects rendered
changed "unload" command to "clear"
changed dobj_trace() to return name of intersected object improved "show" lighting with front-directed light source changed MINTHRESH and cosmetic fixes
Initial revision
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