--- ray/src/rt/dielectric.c	1989/06/07 08:38:31	1.2
+++ ray/src/rt/dielectric.c	1990/10/15 20:39:30	1.5
@@ -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 */