--- ray/src/rt/ambient.c	1989/05/30 11:06:29	1.4
+++ ray/src/rt/ambient.c	1989/09/05 09:46:17	1.7
@@ -203,7 +203,8 @@ double  s;
 		 *  Jittering final test reduces image artifacts.
 		 */
 		wt = sqrt(e1) + sqrt(e2);
-		if (wt > ambacc*(0.9 + 0.2*frandom()))
+		wt *= .9 + .2*frandom();
+		if (wt > ambacc)
 			continue;
 		if (wt <= 1e-3)
 			wt = 1e3;
@@ -381,8 +382,8 @@ register RAY  *r;
 		dnew.n = div[0].n + 1;
 		dnew.t = div[0].t; dnew.p = div[0].p;
 		b2 = bright(dnew.v)/dnew.n - bright(ar.rcol);
-		b2 = b2*b2 + div[0].k*div[0].n;
-		dnew.k = b2/dnew.n;
+		b2 = b2*b2 + div[0].k*(div[0].n*div[0].n);
+		dnew.k = b2/(dnew.n*dnew.n);
 						/* reinsert */
 		for (k = 0; k < ne-1 && dnew.k < div[k+1].k; k++)
 			bcopy(&div[k+1], &div[k], sizeof(AMBSAMP));