--- ray/src/gen/mkillum.h	1991/07/25 10:59:03	1.4
+++ ray/src/gen/mkillum.h	1991/08/23 12:30:31	1.5
@@ -26,6 +26,7 @@ struct illum_args {
 	char	altmat[MAXSTR];		/* alternate material name */
 	int	sampdens;		/* point sample density */
 	int	nsamps;			/* # of samples in each direction */
+	float	minbrt;			/* minimum average brightness */
 	float	col[3];			/* computed average color */
 };				/* illum options */