--- ray/src/hd/rhdisp3.c	1998/07/07 11:07:42	3.10
+++ ray/src/hd/rhdisp3.c	2003/04/23 00:52:33	3.13
@@ -1,9 +1,6 @@
-/* Copyright (c) 1998 Silicon Graphics, Inc. */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ SGI";
+static const char	RCSid[] = "$Id: rhdisp3.c,v 3.13 2003/04/23 00:52:33 greg Exp $";
 #endif
-
 /*
  * Holodeck beam support for display process
  */
@@ -30,6 +27,9 @@ int	bi;
 	FVECT	cp[4], ip[4], pf, pb;
 	double	af, ab, sf2, sb2, dfb2, df2, db2, penalty;
 	register int	i;
+					/* special case */
+	if (hr <= 0 | vr <= 0)
+		return(0);
 					/* compute cell corners in image */
 	if (!hdbcoord(gc, hp, bi))
 		error(CONSISTENCY, "bad beam index in npixels");
@@ -281,9 +281,9 @@ VIEW	*vp;
 	if (cl.cl == NULL)
 		goto memerr;
 	cl.n = 0;			/* add cells within pyramid */
-	visit_cells(org, dir, hp, addcell, &cl);
+	visit_cells(org, dir, hp, addcell, (char *)&cl);
 	if (!cl.n) {
-		free((char *)cl.cl);
+		free((void *)cl.cl);
 		return(NULL);
 	}
 	*np = cl.n * orient;
@@ -292,7 +292,7 @@ VIEW	*vp;
 	 * sorted automatically by visit_cells(), so we don't need this.
 	 */
 					/* optimize memory use */
-	cl.cl = (GCOORD *)realloc((char *)cl.cl, cl.n*sizeof(GCOORD));
+	cl.cl = (GCOORD *)realloc((void *)cl.cl, cl.n*sizeof(GCOORD));
 	if (cl.cl == NULL)
 		goto memerr;
 					/* sort the list */