--- ray/src/rt/dielectric.c	1990/03/27 11:39:58	1.3
+++ ray/src/rt/dielectric.c	1991/08/05 13:52:20	1.6
@@ -66,6 +66,8 @@ register RAY  *r;
 	if (m->oargs.nfargs != (m->otype==MAT_DIELECTRIC ? 5 : 8))
 		objerror(m, USER, "bad arguments");
 
+	r->rt = r->rot;				/* just use ray length */
+
 	raytexture(r, m->omod);			/* get modifiers */
 
 	cos1 = raynormal(dnorm, r);		/* cosine of theta1 */
@@ -127,6 +129,7 @@ register RAY  *r;
 			if (m->otype != MAT_DIELECTRIC
 					|| r->rod > 0.0
 					|| r->crtype & SHADOW
+					|| directinvis
 					|| m->oargs.farg[4] == 0.0
 					|| !disperse(m, r, p.rdir, trans))
 #endif
@@ -135,7 +138,6 @@ register RAY  *r;
 				multcolor(mcolor, r->pcol);	/* modify */
 				scalecolor(p.rcol, trans);
 				addcolor(r->rcol, p.rcol);
-				r->rt = r->rot + p.rt;
 			}
 		}
 	}
@@ -151,8 +153,6 @@ register RAY  *r;
 
 		scalecolor(p.rcol, refl);	/* color contribution */
 		addcolor(r->rcol, p.rcol);
-		if (refl > trans)
-			r->rt = r->rot + p.rt;
 	}
 
 	multcolor(r->rcol, mcolor);		/* multiply by transmittance */