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Comparing ray/src/util/radcompare.c (file contents):
Revision 2.26 by greg, Mon Jul 27 16:49:56 2020 UTC vs.
Revision 2.28 by greg, Mon Sep 27 19:00:04 2021 UTC

# Line 197 | Line 197 | real_check(double r1, double r2)
197  
198          if (rel_min > 0) {      /* doing relative differences? */
199                  double  av2 = .25*(r1*r1 + 2.*fabs(r1*r2) + r2*r2);
200 <                if (av2 > rel_min*rel_min)
201 <                        diff2 /= av2;
200 >                if (av2 < rel_min*rel_min)
201 >                        av2 = rel_min*rel_min;
202 >                diff2 /= av2;
203          }
204          if (max_lim >= 0 && diff2 > max_lim*max_lim) {
205                  if (report != REP_QUIET)
# Line 372 | Line 373 | setheadvar(char *val, void *p)
373                  tep->key = strcpy(malloc(kln+1), key);
374          if (tep->data) {        /* check for special cases */
375                  if (!strcmp(key, "EXPOSURE")) {
376 <                        sprintf(newval, "%f", atof(tep->data)*atof(val));
376 >                        sprintf(newval, "%.6e", atof(tep->data)*atof(val));
377                          vln = strlen(val = newval);
378                  }
379                  free(tep->data);

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