--- ray/src/rt/rv3.c	1990/02/22 11:46:15	1.13
+++ ray/src/rt/rv3.c	1991/05/21 17:41:19	1.20
@@ -93,8 +93,11 @@ double  *mp;
 		(*dev->comout)("Pick view center\n");
 		if ((*dev->getcur)(&x, &y) == ABORT)
 			return(-1);
-		viewray(thisray.rorg, thisray.rdir, &ourview,
-				(x+.5)/hresolu, (y+.5)/vresolu);
+		if (viewray(thisray.rorg, thisray.rdir, &ourview,
+				(x+.5)/hresolu, (y+.5)/vresolu) < 0) {
+			error(COMMAND, "not on image");
+			return(-1);
+		}
 		if (!direc || ourview.type == VT_PAR) {
 			rayorigin(&thisray, NULL, PRIMARY, 1.0);
 			if (!localhit(&thisray, &thescene)) {
@@ -138,7 +141,6 @@ int  xmin, ymin, xmax, ymax;
 	static long  lastflush = 0;
 	static RAY  thisray;
 	double  h, v;
-	register int  i;
 
 	if (xmax - xmin <= 0 || ymax - ymin <= 0) {	/* empty */
 		p->x = xmin;
@@ -147,19 +149,21 @@ int  xmin, ymin, xmax, ymax;
 		return;
 	}
 						/* jitter ray direction */
-	p->x = h = xmin + (xmax-xmin)*frandom();
-	h /= hresolu;
-	p->y = v = ymin + (ymax-ymin)*frandom();
-	v /= vresolu;
+	h = xmin + (xmax-xmin)*frandom();
+	v = ymin + (ymax-ymin)*frandom();
 	
-	viewray(thisray.rorg, thisray.rdir, &ourview, h, v);
+	if (viewray(thisray.rorg, thisray.rdir, &ourview,
+			h/hresolu, v/vresolu) < 0) {
+		setcolor(thisray.rcol, 0.0, 0.0, 0.0);
+	} else {
+		rayorigin(&thisray, NULL, PRIMARY, 1.0);
+		samplendx++;
+		rayvalue(&thisray);
+	}
 
-	rayorigin(&thisray, NULL, PRIMARY, 1.0);
-	
-	rayvalue(&thisray);
-
+	p->x = h;
+	p->y = v;
 	copycolor(p->v, thisray.rcol);
-
 	scalecolor(p->v, exposure);
 
 	(*dev->paintr)(greyscale?greyof(p->v):p->v, xmin, ymin, xmax, ymax);
@@ -175,6 +179,8 @@ newimage()				/* start a new image */
 {
 						/* free old image */
 	freepkids(&ptrunk);
+						/* save reserve memory */
+	fillreserves();
 						/* compute resolution */
 	hresolu = dev->xsiz;
 	vresolu = dev->ysiz;
@@ -360,7 +366,7 @@ register VIEW  *vp;
 	} else if (bcmp((char *)vp, (char *)&ourview, sizeof(VIEW))) {
 		copystruct(&oldview, &ourview);
 		copystruct(&ourview, vp);
-		newimage();		/* newimage() calls with vp=&ourview! */
+		newimage();
 	}
 }
 
@@ -400,24 +406,33 @@ FVECT  vc;
 }
 
 
-spinvector(vres, vorig, vnorm, theta)	/* rotate vector around normal */
-FVECT  vres, vorig, vnorm;
-double  theta;
+zoomview(vp, zf)			/* zoom in our out */
+register VIEW  *vp;
+double  zf;
 {
-	extern double  sin(), cos();
-	double  sint, cost, dotp;
-	FVECT  vperp;
-	register int  i;
-	
-	if (theta == 0.0) {
-		VCOPY(vres, vorig);
+	switch (vp->type) {
+	case VT_PAR:				/* parallel view */
+	case VT_ANG:				/* angular fisheye */
+		vp->horiz /= zf;
+		vp->vert /= zf;
 		return;
+	case VT_PER:				/* perspective view */
+		vp->horiz = atan(tan(vp->horiz*(PI/180./2.))/zf) /
+				(PI/180./2.);
+		vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) /
+				(PI/180./2.);
+		return;
+	case VT_HEM:				/* hemispherical fisheye */
+		vp->horiz = sin(vp->horiz*(PI/180./2.))/zf;
+		if (vp->horiz >= 1.0-FTINY)
+			vp->horiz = 180.;
+		else
+			vp->horiz = asin(vp->horiz) / (PI/180./2.);
+		vp->vert = sin(vp->vert*(PI/180./2.))/zf;
+		if (vp->vert >= 1.0-FTINY)
+			vp->vert = 180.;
+		else
+			vp->vert = asin(vp->vert) / (PI/180./2.);
+		return;
 	}
-	sint = sin(theta);
-	cost = cos(theta);
-	dotp = DOT(vorig, vnorm);
-	fcross(vperp, vnorm, vorig);
-	for (i = 0; i < 3; i++)
-		vres[i] = vnorm[i]*dotp*(1.-cost) +
-				vorig[i]*cost + vperp[i]*sint;
 }