--- ray/src/hd/rhd_qtree.h	1997/11/25 16:52:04	3.5
+++ ray/src/hd/rhd_qtree.h	1997/12/05 09:39:20	3.6
@@ -33,6 +33,7 @@ typedef struct rtree {
 
 extern struct rleaves {
 	float		(*wp)[3];	/* world intersection point array */
+	short		(*wd)[2];	/* world direction array */
 	TMbright	*brt;		/* encoded brightness array */
 	BYTE		(*chr)[3];	/* encoded chrominance array */
 	BYTE		(*rgb)[3];	/* tone-mapped color array */