--- ray/src/rt/rv3.c	1994/12/22 11:46:19	2.7
+++ ray/src/rt/rv3.c	1995/08/18 10:27:11	2.9
@@ -410,10 +410,14 @@ FVECT  vc;
 		nv.horiz = ourview.horiz;
 		nv.vert = ourview.vert;
 		d = sqrt(dist2(ourview.vp, vc)) / mag;
-		nv.vfore = ourview.vfore + d - d*mag;
-		if (nv.vfore < 0.0) nv.vfore = 0.0;
-		nv.vaft = ourview.vaft + d - d*mag;
-		if (nv.vaft < nv.vfore) nv.vaft = 0.0;
+		if ((nv.vfore = ourview.vfore) > FTINY) {
+			nv.vfore += d - d*mag;
+			if (nv.vfore < 0.0) nv.vfore = 0.0;
+		}
+		if ((nv.vaft = ourview.vaft) > FTINY) {
+			nv.vaft += d - d*mag;
+			if (nv.vaft <= nv.vfore) nv.vaft = 0.0;
+		}
 	}
 	for (i = 0; i < 3; i++)
 		nv.vp[i] = vc[i] - d*nv.vdir[i];
@@ -421,15 +425,28 @@ FVECT  vc;
 }
 
 
-zoomview(vp, zf)			/* zoom in our out */
+zoomview(vp, zf)			/* zoom in or out */
 register VIEW  *vp;
 double  zf;
 {
 	switch (vp->type) {
 	case VT_PAR:				/* parallel view */
+		vp->horiz /= zf;
+		vp->vert /= zf;
+		return;
 	case VT_ANG:				/* angular fisheye */
 		vp->horiz /= zf;
+		if (vp->horiz > 360.)
+			vp->horiz = 360.;
 		vp->vert /= zf;
+		if (vp->vert > 360.)
+			vp->vert = 360.;
+		return;
+	case VT_CYL:				/* cylindrical panorama */
+		vp->horiz /= zf;
+		if (vp->horiz > 360.)
+			vp->horiz = 360.;
+		vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) / (PI/180./2.);
 		return;
 	case VT_PER:				/* perspective view */
 		vp->horiz = atan(tan(vp->horiz*(PI/180./2.))/zf) /