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Comparing ray/src/rt/rtrace.c (file contents):
Revision 2.14 by greg, Tue May 4 13:26:52 1993 UTC vs.
Revision 2.15 by greg, Fri Jun 18 10:14:42 1993 UTC

# Line 42 | Line 42 | int  inform = 'a';                     /* input format */
42   int  outform = 'a';                     /* output format */
43   char  *outvals = "v";                   /* output specification */
44  
45 + char  *tralist[128];                    /* list of modifers to trace (or no) */
46 + int  traincl = -1;                      /* include == 1, exclude == 0 */
47 + #define  MAXTSET        511             /* maximum number in trace set */
48 + OBJECT  traset[MAXTSET+1]={0};          /* trace include/exclude set */
49 +
50   int  hresolu = 0;                       /* horizontal (scan) size */
51   int  vresolu = 0;                       /* vertical resolution */
52  
# Line 319 | Line 324 | FILE  *fp;
324   }
325  
326  
327 + tranotify(obj)                  /* record new modifier */
328 + OBJECT  obj;
329 + {
330 +        static int  hitlimit = 0;
331 +        register OBJREC  *o = objptr(obj);
332 +        register char  **tralp;
333 +
334 +        if (hitlimit || !ismodifier(o->otype))
335 +                return;
336 +        for (tralp = tralist; *tralp != NULL; tralp++)
337 +                if (!strcmp(o->oname, *tralp)) {
338 +                        if (traset[0] >= MAXTSET) {
339 +                                error(WARNING, "too many modifiers in trace list");
340 +                                hitlimit++;
341 +                                return;         /* should this be fatal? */
342 +                        }
343 +                        insertelem(traset, obj);
344 +                        return;
345 +                }
346 + }
347 +
348 +
349   static
350   ourtrace(r)                             /* print ray values */
351   RAY  *r;
# Line 326 | Line 353 | RAY  *r;
353          register int  (**tp)();
354  
355          if (every_out[0] == NULL)
356 +                return;
357 +        if (traincl == 1 && r->ro == NULL)
358 +                return;
359 +        if (traincl != -1 && traincl != inset(traset, r->ro->omod))
360                  return;
361          tabin(r);
362          for (tp = every_out; *tp != NULL; tp++)

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