--- ray/src/util/glare.h	1991/03/19 11:11:18	1.6
+++ ray/src/util/glare.h	1991/03/19 17:31:35	1.7
@@ -25,6 +25,8 @@ extern VIEW	leftview, rightview;	/* leftmost and right
 extern int	verbose;		/* verbose reporting */
 extern char	*progname;		/* global argv[0] */
 
+extern double	threshold;		/* threshold value for glare sources */
+
 extern int	sampdens;		/* sample density */
 extern ANGLE	glarang[];		/* glare calculation angles */
 extern int	nglarangs;