--- ray/src/rt/rtrace.c	1993/07/14 10:38:49	2.16
+++ ray/src/rt/rtrace.c	1994/12/21 09:52:00	2.18
@@ -1,4 +1,4 @@
-/* Copyright (c) 1992 Regents of the University of California */
+/* Copyright (c) 1994 Regents of the University of California */
 
 #ifndef lint
 static char SCCSid[] = "$SunId$ LBL";
@@ -61,6 +61,8 @@ double  srcsizerat = .25;		/* maximum ratio source siz
 double  specthresh = .15;		/* specular sampling threshold */
 double  specjitter = 1.;		/* specular sampling jitter */
 
+int  backvis = 1;			/* back face visibility */
+
 int  maxdepth = 6;			/* maximum recursion depth */
 double  minweight = 4e-3;		/* minimum ray weight */
 
@@ -243,6 +245,7 @@ FVECT  org, dir;
 {
 	VCOPY(thisray.rorg, org);
 	VCOPY(thisray.rdir, dir);
+	thisray.rmax = 0.0;
 	rayorigin(&thisray, NULL, PRIMARY, 1.0);
 	if (castonly)
 		localhit(&thisray, &thescene) || sourcehit(&thisray);