--- ray/src/px/warp3d.c	1997/02/05 15:59:07	3.2
+++ ray/src/px/warp3d.c	1998/09/02 18:41:44	3.4
@@ -1,7 +1,7 @@
-/* Copyright (c) 1997 Regents of the University of California */
+/* Copyright (c) 1998 Silicon Graphics, Inc. */
 
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static char SCCSid[] = "$SunId$ SGI";
 #endif
 
 /*
@@ -137,7 +137,7 @@ WARP3D	*wp;
 {
 	W3VEC	cv[8];
 	GNDX	gi;
-	int	rval = 0;
+	int	rval = W3OK;
 	register int	i;
 					/* get corner values */
 	for (i = 0; i < 8; i++) {
@@ -334,7 +334,7 @@ register WARP3D	*wp;
 }
 
 
-long
+unsigned long
 gridhash(gp)			/* hash a grid point index */
 GNDX	gp;
 {
@@ -367,6 +367,9 @@ register WARP3D	*wp;
 	}
 	if (wp->grid.flags & W3EXACT) {
 		wp->grid.gn[0] = wp->grid.gn[1] = wp->grid.gn[2] = 1;
+		wp->grid.gstep[0] = gmax[0] - wp->grid.gmin[0];
+		wp->grid.gstep[1] = gmax[1] - wp->grid.gmin[1];
+		wp->grid.gstep[2] = gmax[2] - wp->grid.gmin[2];
 		return(W3OK);		/* no interpolation, so no grid */
 	}
 				/* create grid */