--- ray/src/rt/source.h	1991/07/16 15:56:44	1.12
+++ ray/src/rt/source.h	1991/07/18 14:43:06	1.13
@@ -96,6 +96,7 @@ extern double  shadthresh;		/* relative shadow thresho
 extern double  shadcert;		/* shadow testing certainty */
 extern int  directrelay;		/* maximum number of source relays */
 extern int  vspretest;			/* virtual source pretest density */
+extern int  directinvis;		/* sources invisible? */
 
 #define  getplaneq(c,o)		(*sfun[(o)->otype].of->getpleq)(c,o)
 #define  getmaxdisk(c,o)	(*sfun[(o)->otype].of->getdisk)(c,o)