--- ray/src/rt/srcsamp.c	1991/10/28 08:07:44	1.7
+++ ray/src/rt/srcsamp.c	1993/03/08 12:37:39	2.5
@@ -15,6 +15,9 @@ static char SCCSid[] = "$SunId$ LBL";
 #include  "random.h"
 
 
+static int  cyl_partit(), flt_partit();
+
+
 double
 nextssamp(r, si)		/* compute sample for source, rtn. distance */
 register RAY  *r;		/* origin is read, direction is set */
@@ -24,7 +27,7 @@ register SRCINDEX  *si;		/* source index (modified to 
 	FVECT  vpos;
 	double  d;
 	register int  i;
-
+nextsample:
 	while (++si->sp >= si->np) {	/* get next sample */
 		if (++si->sn >= nsources)
 			return(0.0);	/* no more */
@@ -76,22 +79,24 @@ register SRCINDEX  *si;		/* source index (modified to 
 			r->rdir[i] -= r->rorg[i];
 					/* compute distance */
 	if ((d = normalize(r->rdir)) == 0.0)
-		return(nextssamp(r, si));	/* at source! */
+		goto nextsample;		/* at source! */
 
 					/* compute sample size */
 	si->dom  = source[si->sn].ss2;
 	if (source[si->sn].sflags & SFLAT) {
 		si->dom *= sflatform(si->sn, r->rdir);
-		si->dom *= (double)(size[SU]*size[SV])/(MAXSPART*MAXSPART);
+		si->dom *= size[SU]*size[SV]/(MAXSPART*(double)MAXSPART);
 	} else if (source[si->sn].sflags & SCYL) {
 		si->dom *= scylform(si->sn, r->rdir);
-		si->dom *= (double)size[SU]/MAXSPART;
+		si->dom *= size[SU]/(double)MAXSPART;
 	} else {
-		si->dom *= (double)(size[SU]*size[SV]*size[SW]) /
-				(MAXSPART*MAXSPART*MAXSPART) ;
+		si->dom *= size[SU]*size[SV]*(double)size[SW] /
+				(MAXSPART*MAXSPART*(double)MAXSPART) ;
 	}
 	if (source[si->sn].sflags & SDISTANT)
 		return(FHUGE);
+	if (si->dom <= 1e-4)
+		goto nextsample;		/* behind source? */
 	si->dom /= d*d;
 	return(d);		/* sample OK, return distance */
 }