--- ray/src/rt/ambient.c	1991/08/20 10:05:18	1.16
+++ ray/src/rt/ambient.c	1991/11/12 17:09:42	2.1
@@ -186,7 +186,7 @@ double  s;
 		for (j = 0; j < 3; j++)
 			d += (r->rop[j] - av->pos[j]) *
 					(av->dir[j] + r->ron[j]);
-		if (d*0.5 < -minarad*ambacc)
+		if (d*0.5 < -minarad*ambacc-.001)
 			continue;
 		/*
 		 *  Jittering final test reduces image artifacts.
@@ -235,7 +235,7 @@ int  al;
 	FVECT	gp, gd;
 						/* compute weight */
 	amb.weight = pow(AVGREFL, (double)al);
-	if (r->rweight < 0.1*amb.weight)	/* heuristic */
+	if (r->rweight < 0.2*amb.weight)	/* heuristic */
 		amb.weight = r->rweight;
 						/* compute ambient */
 	amb.rad = doambient(acol, r, amb.weight, gp, gd);