--- ray/src/rt/raytrace.c	1997/03/07 16:58:54	2.28
+++ ray/src/rt/raytrace.c	1998/04/29 09:50:41	2.30
@@ -98,11 +98,10 @@ register RAY  *r;
 	r->newcset = r->clipset;
 	r->robj = OVOID;
 	r->ro = NULL;
-	r->rot = FHUGE;
+	r->rt = r->rot = FHUGE;
 	r->pert[0] = r->pert[1] = r->pert[2] = 0.0;
 	setcolor(r->pcol, 1.0, 1.0, 1.0);
 	setcolor(r->rcol, 0.0, 0.0, 0.0);
-	r->rt = 0.0;
 }
 
 
@@ -270,9 +269,9 @@ double  coef;
 		backmat = rayshade(&br, back);
 					/* check for transparency */
 	if (backmat ^ foremat)
-		if (backmat)
+		if (backmat && coef > FTINY)
 			raytrans(&fr);
-		else
+		else if (foremat && coef < 1.0-FTINY)
 			raytrans(&br);
 					/* mix perturbations */
 	for (i = 0; i < 3; i++)