--- ray/src/rt/otspecial.h	2024/12/09 00:44:29	2.11
+++ ray/src/rt/otspecial.h	2025/05/29 16:42:28	2.12
@@ -1,4 +1,4 @@
-/* RCSid $Id: otspecial.h,v 2.11 2024/12/09 00:44:29 greg Exp $ */
+/* RCSid $Id: otspecial.h,v 2.12 2025/05/29 16:42:28 greg Exp $ */
 /*
  * Special type flags for objects used in rendering.
  * Depends on definitions in otypes.h
@@ -13,13 +13,21 @@ extern "C" {
 #define  T_TRANSP	T_SP1
 #define  istransp(m)	(ofun[(m)->otype].flags & T_TRANSP || \
 			  (((m)->otype==MAT_WGMDF) & ((m)->oargs.nsargs > 5) \
-				&& strcmp((m)->oargs.sarg[5], "0")))
+				&& strcmp((m)->oargs.sarg[5], "0")) || \
+			  (((m)->otype==MAT_BRTDF) & ((m)->oargs.nsargs > 5) \
+				&& strcmp((m)->oargs.sarg[3], "0") | \
+				   strcmp((m)->oargs.sarg[4], "0") | \
+				   strcmp((m)->oargs.sarg[5], "0")))
 
-		/* test for completely opaque materials */
+		/* test for opaque (SHADOW) materials */
 #define  T_OPAQUE       T_SP2
 #define  isopaque(m)    (ofun[(m)->otype].flags & T_OPAQUE || \
 			  (((m)->otype==MAT_WGMDF) & ((m)->oargs.nsargs > 5) \
-				&& !strcmp((m)->oargs.sarg[5], "0")))
+				&& !strcmp((m)->oargs.sarg[5], "0")) || \
+			  (((m)->otype==MAT_BRTDF) & ((m)->oargs.nsargs > 5) \
+				&& !strcmp((m)->oargs.sarg[3], "0") & \
+				   !strcmp((m)->oargs.sarg[4], "0") & \
+				   !strcmp((m)->oargs.sarg[5], "0")))
 
 		/* test if we have a BSDF proxy surface */
 #define isBSDFproxy(m)	(((m)->otype==MAT_BSDF) & ((m)->oargs.nsargs > 0) \