--- ray/src/rt/rv3.c	1990/01/09 11:38:19	1.11
+++ ray/src/rt/rv3.c	1994/12/20 20:18:41	2.6
@@ -1,4 +1,4 @@
-/* Copyright (c) 1987 Regents of the University of California */
+/* Copyright (c) 1994 Regents of the University of California */
 
 #ifndef lint
 static char SCCSid[] = "$SunId$ LBL";
@@ -18,7 +18,21 @@ static char SCCSid[] = "$SunId$ LBL";
 
 #include  "random.h"
 
+#ifndef WFLUSH
+#ifdef SPEED
+#define WFLUSH		(5*SPEED)
+#else
+#define WFLUSH		100		/* flush after this many rays */
+#endif
+#endif
 
+#ifdef  SMLFLT
+#define  sscanvec(s,v)	(sscanf(s,"%f %f %f",v,v+1,v+2)==3)
+#else
+#define  sscanvec(s,v)	(sscanf(s,"%lf %lf %lf",v,v+1,v+2)==3)
+#endif
+
+
 getrect(s, r)				/* get a box */
 char  *s;
 register RECT  *r;
@@ -83,14 +97,17 @@ double  *mp;
 		error(COMMAND, "illegal magnification");
 		return(-1);
 	}
-	if (sscanf(s, "%*lf %lf %lf %lf", &vec[0], &vec[1], &vec[2]) != 3) {
+	if (!sscanvec(sskip(s), vec)) {
 		if (dev->getcur == NULL)
 			return(-1);
 		(*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 ((thisray.rmax = viewray(thisray.rorg, thisray.rdir,
+			&ourview, (x+.5)/hresolu, (y+.5)/vresolu)) < -FTINY) {
+			error(COMMAND, "not on image");
+			return(-1);
+		}
 		if (!direc || ourview.type == VT_PAR) {
 			rayorigin(&thisray, NULL, PRIMARY, 1.0);
 			if (!localhit(&thisray, &thescene)) {
@@ -130,9 +147,10 @@ paint(p, xmin, ymin, xmax, ymax)	/* compute and paint 
 register PNODE  *p;
 int  xmin, ymin, xmax, ymax;
 {
+	extern unsigned long  nrays;
+	static unsigned long  lastflush = 0;
 	static RAY  thisray;
 	double  h, v;
-	register int  i;
 
 	if (xmax - xmin <= 0 || ymax - ymin <= 0) {	/* empty */
 		p->x = xmin;
@@ -141,22 +159,29 @@ 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 ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, &ourview,
+			h/hresolu, v/vresolu)) < -FTINY) {
+		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);
+
+	if (dev->flush != NULL && nrays - lastflush >= WFLUSH) {
+		lastflush = nrays;
+		(*dev->flush)();
+	}
 }
 
 
@@ -164,6 +189,8 @@ newimage()				/* start a new image */
 {
 						/* free old image */
 	freepkids(&ptrunk);
+						/* save reserve memory */
+	fillreserves();
 						/* compute resolution */
 	hresolu = dev->xsiz;
 	vresolu = dev->ysiz;
@@ -346,10 +373,10 @@ register VIEW  *vp;
 	if ((err = setview(vp)) != NULL) {
 		sprintf(errmsg, "view not set - %s", err);
 		error(COMMAND, errmsg);
-	} else if (bcmp(vp, &ourview, sizeof(VIEW))) {
-		copyview(&oldview, &ourview);
-		copyview(&ourview, vp);
-		newimage();		/* newimage() calls with vp=&ourview! */
+	} else if (bcmp((char *)vp, (char *)&ourview, sizeof(VIEW))) {
+		copystruct(&oldview, &ourview);
+		copystruct(&ourview, vp);
+		newimage();
 	}
 }
 
@@ -358,7 +385,6 @@ moveview(angle, elev, mag, vc)			/* move viewpoint */
 double  angle, elev, mag;
 FVECT  vc;
 {
-	extern double  sqrt(), dist2();
 	double  d;
 	FVECT  v1;
 	VIEW  nv;
@@ -389,24 +415,33 @@ 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;
 }