--- ray/src/rt/virtuals.c	1991/08/06 15:02:36	1.22
+++ ray/src/rt/virtuals.c	1991/10/01 14:29:16	1.27
@@ -287,7 +287,8 @@ register int  sn;	/* target source number */
 	getplaneq(onorm, o);
 				/* set number of rays to sample */
 	if (source[sn].sflags & SDISTANT) {
-		n = 4.*or2/(thescene.cusize*thescene.cusize)*vspretest + .5;
+					/* 32. == heuristic constant */
+		n = 32.*or2/(thescene.cusize*thescene.cusize)*vspretest + .5;
 		infront = DOT(onorm, source[sn].sloc) > 0.;
 	} else {
 		for (i = 0; i < 3; i++)
@@ -318,9 +319,9 @@ register int  sn;	/* target source number */
 #endif
 				return(f);	/* too small a target! */
 			}
+			multisamp(offsdir, 3, urand(sn*931+5827+ssn));
 			for (i = 0; i < 3; i++)
-				offsdir[i] = or*(1. -
-					2.*urand(urind(931*i+5827,ssn)));
+				offsdir[i] = or*(1. - 2.*offsdir[i]);
 			ssn++;
 			for (i = 0; i < 3; i++)
 				sr.rorg[i] = oc[i] + offsdir[i];