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Comparing ray/src/rt/source.c (file contents):
Revision 2.68 by greg, Mon Jun 11 15:10:49 2018 UTC vs.
Revision 2.69 by greg, Wed Nov 7 18:22:29 2018 UTC

# Line 52 | Line 52 | findmaterial(OBJREC *o)
52                          aobj = lastmod(objndx(o), o->oargs.sarg[0]);
53                          if (aobj < 0)
54                                  objerror(o, USER, "bad reference");
55 <                        ao = objptr(aobj);
56 <                        if (ismaterial(ao->otype))
55 >                                /* recursive check on alias branch */
56 >                        if ((ao = findmaterial(objptr(aobj))) != NULL)
57                                  return(ao);
58 –                        if (ao->otype == MOD_ALIAS) {
59 –                                o = ao;
60 –                                continue;
61 –                        }
58                  }
59                  if (o->omod == OVOID)
60                          return(NULL);

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