--- ray/src/px/pcomb.c	1996/09/03 11:30:37	2.18
+++ ray/src/px/pcomb.c	1996/09/19 12:10:46	2.20
@@ -319,6 +319,7 @@ init()					/* perform final setup */
 	double	l_colin(), l_expos(), l_pixaspect(), l_ray(), l_psize();
 	register int	i;
 						/* define constants */
+	varset("PI", ':', PI);
 	varset(vnfiles, ':', (double)nfiles);
 	varset(vxmax, ':', (double)xmax);
 	varset(vymax, ':', (double)ymax);
@@ -533,6 +534,7 @@ register char	*nam;
 	if (ltick[fn] < eclock) {		/* need to compute? */
 		lorg[fn][0] = lorg[fn][1] = lorg[fn][2] = 0.0;
 		ldir[fn][0] = ldir[fn][1] = ldir[fn][2] = 0.0;
+		ldist[fn] = -1.0;
 		if (input[fn].vw.type == 0)
 			errno = EDOM;
 		else {