--- ray/src/rt/o_cone.c	1989/02/02 10:41:31	1.1
+++ ray/src/rt/o_cone.c	1990/12/15 15:03:28	1.3
@@ -1,4 +1,4 @@
-/* Copyright (c) 1986 Regents of the University of California */
+/* Copyright (c) 1990 Regents of the University of California */
 
 #ifndef lint
 static char SCCSid[] = "$SunId$ LBL";
@@ -86,6 +86,7 @@ register RAY  *r;
 			r->rop[i] = r->rorg[i] + r->rdir[i]*r->rot;
 		VCOPY(r->ron, co->ad);
 		r->rod = -rdx[2];
+		r->rox = NULL;
 		return(1);				/* good */
 	}
 					/* roots for cone, cup, cyl., tube */
@@ -129,6 +130,7 @@ register RAY  *r;
 				r->ron[i] = (co->al*r->ron[i] - c*co->ad[i])
 						/co->sl;
 		r->rod = -DOT(r->rdir, r->ron);
+		r->rox = NULL;
 		return(1);			/* good */
 	}
 	return(0);