--- ray/src/rt/dielectric.c	1992/10/02 16:17:04	2.2
+++ ray/src/rt/dielectric.c	1992/11/19 20:30:02	2.3
@@ -128,7 +128,7 @@ register RAY  *r;
 			if (m->otype != MAT_DIELECTRIC
 					|| r->rod > 0.0
 					|| r->crtype & SHADOW
-					|| directinvis
+					|| !directvis
 					|| m->oargs.farg[4] == 0.0
 					|| !disperse(m, r, p.rdir, trans))
 #endif