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Comparing ray/src/rt/source.c (file contents):
Revision 2.8 by greg, Sat Nov 14 13:58:23 1992 UTC vs.
Revision 2.10 by greg, Mon Feb 22 15:54:04 1993 UTC

# Line 383 | Line 383 | char  *p;                      /* data for f */
383   */
384  
385   #define  distglow(m, r)         (m->otype==MAT_GLOW && \
386 +                                m->oargs.farg[3] >= -FTINY && \
387                                  r->rot > m->oargs.farg[3])
388  
389   /* badcomponent *
# Line 418 | Line 419 | char  *p;                      /* data for f */
419  
420   /* srcignore *
421   *
422 < * The -di flag renders light sources invisible, and here is the test.
422 > * The -dv flag is normally on for sources to be visible.
423   */
424  
425 < #define  srcignore(m, r)        (directinvis && !(r->crtype&SHADOW) && \
425 > #define  srcignore(m, r)        (!directvis && !(r->crtype&SHADOW) && \
426                                  !distglow(m, r))
427  
428  

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