--- ray/src/rt/source.c	1995/12/08 18:22:28	2.19
+++ ray/src/rt/source.c	1996/03/21 15:33:09	2.23
@@ -22,6 +22,10 @@ static char SCCSid[] = "$SunId$ LBL";
 
 extern double  ssampdist;		/* scatter sampling distance */
 
+#ifndef MAXSSAMP
+#define MAXSSAMP	16		/* maximum samples per ray */
+#endif
+
 /*
  * Structures used by direct()
  */
@@ -333,8 +337,7 @@ char  *p;			/* data for f */
 				( sr.ro != source[scp->sno].so ||
 				source[scp->sno].sflags & SFOLLOW )) {
 						/* follow entire path */
-			if (!raycont(&sr))
-				objerror(sr.ro, USER, "material not found");
+			raycont(&sr);
 			rayparticipate(&sr);
 			if (trace != NULL)
 				(*trace)(&sr);	/* trace execution */
@@ -374,6 +377,7 @@ char  *p;			/* data for f */
 srcscatter(r)			/* compute source scattering into ray */
 register RAY  *r;
 {
+	int  oldsampndx;
 	int  nsamps;
 	RAY  sr;
 	SRCINDEX  si;
@@ -381,11 +385,17 @@ register RAY  *r;
 	COLOR  cumval, ctmp;
 	int  i, j;
 
-	if (r->slights == NULL || r->slights[0] == 0 || r->gecc >= 1.-FTINY)
+	if (r->slights == NULL || r->slights[0] == 0
+			|| r->gecc >= 1.-FTINY || r->rot >= FHUGE)
 		return;
 	if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1)
 		nsamps = 1;
-	initsrcindex(&si);
+#if MAXSSAMP
+	else if (nsamps > MAXSSAMP)
+		nsamps = MAXSSAMP;
+#endif
+	oldsampndx = samplendx;
+	samplendx = random()&0x7fff;		/* randomize */
 	for (i = r->slights[0]; i > 0; i--) {	/* for each source */
 		setcolor(cumval, 0., 0., 0.);
 		lastt = r->rot;
@@ -396,15 +406,12 @@ register RAY  *r;
 			sr.rorg[1] = r->rorg[1] + r->rdir[1]*t;
 			sr.rorg[2] = r->rorg[2] + r->rdir[2]*t;
 			sr.rmax = 0.;
-						/* sample ray to this source */
-			if (si.sp >= si.np-1 || !srcray(&sr, NULL, &si) ||
-					sr.rsrc != r->slights[i]) {
-				si.sn = r->slights[i]-1;	/* reset */
-				si.np = 0;
-				if (!srcray(&sr, NULL, &si) ||
-						sr.rsrc != r->slights[i])
-					continue;		/* no path */
-			}
+			initsrcindex(&si);	/* sample ray to this source */
+			si.sn = r->slights[i];
+			nopart(&si, &sr);
+			if (!srcray(&sr, NULL, &si) ||
+					sr.rsrc != r->slights[i])
+				continue;		/* no path */
 			copycolor(sr.cext, r->cext);
 			sr.albedo = r->albedo;
 			sr.gecc = r->gecc;
@@ -438,6 +445,7 @@ register RAY  *r;
 		multcolor(cumval, ctmp);
 		addcolor(r->rcol, cumval);	/* sum into ray result */
 	}
+	samplendx = oldsampndx;
 }