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Comparing ray/src/rt/raytrace.c (file contents):
Revision 2.76 by greg, Fri Feb 22 17:12:58 2019 UTC vs.
Revision 2.77 by greg, Fri Feb 22 19:42:27 2019 UTC

# Line 116 | Line 116 | rayorigin(             /* start new ray from old one */
116                  if (photonMapping && rt != TRANS)
117                          return(-1);
118          }
119 <        if (maxdepth <= 0 && rc != NULL) {      /* Russian roulette */
119 >        if ((maxdepth <= 0) & (rc != NULL)) {   /* Russian roulette */
120                  if (minweight <= 0.0)
121                          error(USER, "zero ray weight in Russian roulette");
122 <                if (maxdepth < 0 && r->rlvl > -maxdepth)
122 >                if ((maxdepth < 0) & (r->rlvl > -maxdepth))
123                          return(-1);             /* upper reflection limit */
124                  if (r->rweight >= minweight)
125                          return(0);
# Line 130 | Line 130 | rayorigin(             /* start new ray from old one */
130                  r->rweight = minweight;
131                  return(0);
132          }
133 <        return(r->rweight >= minweight && r->rlvl <= abs(maxdepth) ? 0 : -1);
133 >        return((r->rweight >= minweight) & (r->rlvl <= abs(maxdepth)) ? 0 : -1);
134   }
135  
136  
# Line 403 | Line 403 | raycontrib(            /* compute (cumulative) ray contribution
403          int  flags
404   )
405   {
406 +        static int      warnedPM = 0;
407 +
408          rc[0] = rc[1] = rc[2] = 1.;
409  
410          while (r != NULL && r->crtype&flags) {
411                  int     i = 3;
412                  while (i--)
413                          rc[i] *= colval(r->rcoef,i);
414 +                                        /* check for participating medium */
415 +                if (!warnedPM && (bright(r->cext) > FTINY) |
416 +                                (bright(r->albedo) > FTINY)) {
417 +                        error(WARNING,
418 +        "ray contribution calculation does not support participating media");
419 +                        warnedPM++;
420 +                }
421                  r = r->parent;
422          }
423   }

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