--- ray/src/rt/source.h	1991/10/21 14:27:34	1.15
+++ ray/src/rt/source.h	1991/11/08 16:34:21	1.16
@@ -113,6 +113,8 @@ extern double  scylform();		/* cosine to axis of cylin
 
 #define  sflatform(sn,dir)	-DOT(source[sn].snorm, dir)
 
+extern OBJREC  *vsmaterial();		/* virtual source material */
+
 extern double  intercircle();		/* intersect two circles */
 extern double  spotdisk();		/* intersecting disk for spot */
 extern double  beamdisk();		/* intersecting disk for beam */