--- ray/src/hd/rhcopy.c	2008/11/10 19:08:19	3.24
+++ ray/src/hd/rhcopy.c	2017/05/03 21:15:06	3.29
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: rhcopy.c,v 3.24 2008/11/10 19:08:19 greg Exp $";
+static const char	RCSid[] = "$Id: rhcopy.c,v 3.29 2017/05/03 21:15:06 greg Exp $";
 #endif
 /*
  * Copy data into a holodeck file
@@ -134,7 +134,7 @@ openholo(		/* open existing holodeck file for i/o */
 	FILE	*fp;
 	int	fd;
 	int	hflags = 0;
-	long	nextloc;
+	off_t	nextloc;
 	int	n;
 					/* open holodeck file */
 	if ((fp = fopen(fname, append ? "r+" : "r")) == NULL) {
@@ -152,7 +152,7 @@ openholo(		/* open existing holodeck file for i/o */
 	nextloc = ftell(fp);			/* get stdio position */
 	fclose(fp);				/* done with stdio */
 	for (n = 0; nextloc > 0L; n++) {	/* initialize each section */
-		lseek(fd, (off_t)nextloc, SEEK_SET);
+		lseek(fd, nextloc, SEEK_SET);
 		read(fd, (char *)&nextloc, sizeof(nextloc));
 		hdinit(fd, NULL)->priv = hflags&H_OBST ? &obstr :
 				hflags&H_OBSF ? &unobstr : (char *)NULL;
@@ -176,7 +176,7 @@ addray(		/* add a ray to our output holodeck */
 	int	sn, bi, n;
 	register HOLO	*hp;
 	GCOORD	gc[2];
-	BYTE	rr[2][2];
+	uby8	rr[2][2];
 	BEAM	*bp;
 	double	d0, d1;
 	unsigned	dc;
@@ -359,7 +359,7 @@ addpicz(		/* add a picture + depth-buffer */
 		error(USER, errmsg);
 	}
 	if (phd.altprims) {
-		sprintf(errmsg, "ignoring primary values in picture \"%s\"",
+		sprintf(errmsg, "ignoring color primaries in picture \"%s\"",
 				pcf);
 		error(WARNING, errmsg);
 	}
@@ -398,6 +398,8 @@ addpicz(		/* add a picture + depth-buffer */
 			error(USER, errmsg);
 		}
 		for (i = scanlen(&prs); i--; ) {	/* do each pixel */
+			if (zscn[i] <= 0.0)
+				continue;		/* illegal depth */
 			pix2loc(vl, &prs, i, j);
 			aftd = viewray(ro, rd, &phd.vw, vl[0], vl[1]);
 			if (aftd < -FTINY)