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Comparing ray/src/rt/source.c (file contents):
Revision 2.2 by greg, Thu Jan 9 09:53:00 1992 UTC vs.
Revision 2.3 by greg, Sun Apr 12 10:05:32 1992 UTC

# Line 41 | Line 41 | static int  maxcntr = 0;               /* size of contribution arra
41  
42   marksources()                   /* find and mark source objects */
43   {
44 +        int  foundsource = 0;
45          int  i;
46          register OBJREC  *o, *m;
47          register int  ns;
# Line 93 | Line 94 | marksources()                  /* find and mark source objects */
94                                  source[ns].sflags |= SSKIP;
95                          }
96                  }
97 +                if (!(source[ns].sflags & SSKIP))
98 +                        foundsource++;
99          }
100 <        if (nsources <= 0) {
100 >        if (!foundsource) {
101                  error(WARNING, "no light sources found");
102                  return;
103          }

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