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Comparing ray/src/rt/source.c (file contents):
Revision 1.29 by greg, Fri Dec 28 20:37:08 1990 UTC vs.
Revision 1.30 by greg, Mon Feb 11 08:43:48 1991 UTC

#	Line 109 | Line 109 | register OBJREC  *so;
109		register int  i;
110
111		src->sflags = 0;
112	+	src->aimsuccess = 2*AIMREQT-1;          /* bitch on second failure */
113		src->nhits = 1; src->ntests = 2;        /* start probability = 1/2 */
114		src->so = so;
115
#	Line 337 | Line 338 | char  *p;                      /* data for f */
338		if (cntord[sn].brt <= 0.0)
339		continue;
340		/* compute intersection */
341	<	if (!( source[sn].sflags & SDISTANT ?
341	>	if (source[sn].sflags & SDISTANT ?
342		sourcehit(&sr) :
343		(*ofun[source[sn].so->otype].funp)
344	<	(source[sn].so, &sr) )) {
344	>	(source[sn].so, &sr)) {
345	>	if (source[sn].aimsuccess >= 0)
346	>	source[sn].aimsuccess++;
347	>	} else {
348	>	cntord[sn].brt = 0.0;
349	>	if (source[sn].aimsuccess < 0)
350	>	continue;       /* bitched already */
351	>	source[sn].aimsuccess -= AIMREQT;
352	>	if (source[sn].aimsuccess >= 0)
353	>	continue;       /* leniency */
354		sprintf(errmsg,
355		"aiming failure for light source \"%s\"",
356		source[sn].so->oname);
357		error(WARNING, errmsg);
348	–	cntord[sn].brt = 0.0;
358		continue;
359		}
360		/* compute contribution */

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