--- ray/src/rt/ambient.c	2017/01/27 22:00:49	2.104
+++ ray/src/rt/ambient.c	2018/01/09 05:01:15	2.105
@@ -1,4 +1,4 @@
-static const char	RCSid[] = "$Id: ambient.c,v 2.104 2017/01/27 22:00:49 greg Exp $";
+static const char	RCSid[] = "$Id: ambient.c,v 2.105 2018/01/09 05:01:15 greg Exp $";
 /*
  *  ambient.c - routines dealing with ambient (inter-reflected) component.
  *
@@ -12,8 +12,10 @@ static const char	RCSid[] = "$Id: ambient.c,v 2.104 20
 #include  "platform.h"
 #include  "ray.h"
 #include  "otypes.h"
+#include  "otspecial.h"
 #include  "resolu.h"
 #include  "ambient.h"
+#include  "source.h"
 #include  "random.h"
 #include  "pmapamb.h"
 
@@ -415,7 +417,8 @@ plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang)
 	VSUM(rtst.rdir, vdif, anorm, t[1]);	/* further dist. > plane */
 	rtst.rmax = normalize(rtst.rdir);	/* short ray test */
 	while (localhit(&rtst, &thescene)) {	/* check for occluder */
-		if (rtst.ro->omod != OVOID &&
+		OBJREC	*m = findmaterial(rtst.ro);
+		if (m != NULL && !istransp(m->otype) && !isBSDFproxy(m) &&
 				(rtst.clipset == NULL ||
 					!inset(rtst.clipset, rtst.ro->omod)))
 			return(1);		/* plug light leak */