--- ray/src/util/vwrays.c	2019/03/04 22:41:20	3.19
+++ ray/src/util/vwrays.c	2021/12/03 17:22:28	3.22
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: vwrays.c,v 3.19 2019/03/04 22:41:20 greg Exp $";
+static const char	RCSid[] = "$Id: vwrays.c,v 3.22 2021/12/03 17:22:28 greg Exp $";
 #endif
 /*
  * Compute rays corresponding to a given picture or view.
@@ -133,14 +133,10 @@ main(
 			fprintf(stderr, "%s: no view in picture\n", argv[i]);
 			exit(1);
 		}
-		if (i+1 < argc) {
-			zfd = open(argv[i+1], O_RDONLY);
-			if (zfd < 0) {
-				fprintf(stderr,
-					"%s: cannot open depth buffer\n",
-						argv[i+1]);
+		if (!getdim & (i+1 < argc)) {
+			zfd = open_float_depth(argv[i+1], (long)rs.xr*rs.yr);
+			if (zfd < 0)
 				exit(1);
-			}
 		}
 	}
 	if ((err = setview(&vw)) != NULL) {
@@ -151,7 +147,7 @@ main(
 		normaspect(viewaspect(&vw), &pa, &rs.xr, &rs.yr);
 	if (getdim) {
 		printf("-x %d -y %d -ld%c\n", rs.xr, rs.yr,
-				vw.vaft > FTINY ? '+' : '-');
+				(i+1 == argc) & (vw.vaft > FTINY) ? '+' : '-');
 		exit(0);
 	}
 	if (fromstdin)
@@ -190,7 +186,7 @@ pix2rays(
 	RREAL	loc[2];
 	int	pp[2];
 	double	d;
-	int	i;
+	int	i, c;
 
 	while (fscanf(fp, "%lf %lf", &px, &py) == 2) {
 		px += .5; py += .5;
@@ -213,20 +209,25 @@ pix2rays(
 				exit(1);
 			}
 		}
-		jitterloc(loc);
-		d = viewray(rorg, rdir, &vw, loc[0], loc[1]);
-		if (d < -FTINY)
-			rorg[0] = rorg[1] = rorg[2] =
-			rdir[0] = rdir[1] = rdir[2] = 0.;
-		else if (zfd >= 0)
-			for (i = 0; i < 3; i++) {
-				rorg[i] += rdir[i]*zval;
-				rdir[i] = -rdir[i];
+		for (c = repeatcnt; c-- > 0; ) {
+			jitterloc(loc);
+			d = viewray(rorg, rdir, &vw, loc[0], loc[1]);
+			if (d < -FTINY)
+				rorg[0] = rorg[1] = rorg[2] =
+				rdir[0] = rdir[1] = rdir[2] = 0.;
+			else if (zfd >= 0)
+				for (i = 0; i < 3; i++) {
+					rorg[i] += rdir[i]*zval;
+					rdir[i] = -rdir[i];
+				}
+			else if (d > FTINY) {
+				rdir[0] *= d; rdir[1] *= d; rdir[2] *= d;
 			}
-		else if (d > FTINY) {
-			rdir[0] *= d; rdir[1] *= d; rdir[2] *= d;
+			(*putr)(rorg, rdir);
+			if (c) {
+				loc[0] = px/rs.xr; loc[1] = py/rs.yr;
+			}
 		}
-		(*putr)(rorg, rdir);
 		if (unbuffered)
 			fflush(stdout);
 	}
@@ -273,8 +274,8 @@ putrays(void)
 				rdir[0] = rdir[1] = rdir[2] = 0.;
 			else if (zfd >= 0)
 				for (i = 0; i < 3; i++) {
-					rorg[i] += rdir[i]*zbuf[si];
-					rdir[i] = -rdir[i];
+					rdir[i] = -rdir[i]*zbuf[si];
+					rorg[i] -= rdir[i];
 				}
 			else if (d > FTINY) {
 				rdir[0] *= d; rdir[1] *= d; rdir[2] *= d;