--- ray/src/rt/rv2.c	1989/02/03 07:58:07	1.2
+++ ray/src/rt/rv2.c	1989/06/07 08:38:35	1.6
@@ -75,6 +75,7 @@ char  *s;
 	FILE  *fp;
 	char  buf[128];
 	char  *fname, *getpath();
+	int  change = 0;
 	VIEW  nv;
 
 	if (sscanf(s, "%s", buf) == 1) {	/* write parameters to a file */
@@ -94,37 +95,46 @@ char  *s;
 	(*dev->comout)(buf);
 	(*dev->comin)(buf);
 	if (buf[0] == CTRL(C)) return;
-	if (buf[0])
+	if (buf[0] && buf[0] != ourview.type) {
 		nv.type = buf[0];
-	else
+		change++;
+	} else
 		nv.type = ourview.type;
 	sprintf(buf, "view point (%.6g %.6g %.6g): ",
 			ourview.vp[0], ourview.vp[1], ourview.vp[2]);
 	(*dev->comout)(buf);
 	(*dev->comin)(buf);
 	if (buf[0] == CTRL(C)) return;
-	if (sscanf(buf, "%lf %lf %lf", &nv.vp[0], &nv.vp[1], &nv.vp[2]) != 3)
+	if (sscanf(buf, "%lf %lf %lf", &nv.vp[0], &nv.vp[1], &nv.vp[2]) == 3)
+		change++;
+	else
 		VCOPY(nv.vp, ourview.vp);
 	sprintf(buf, "view direction (%.6g %.6g %.6g): ",
 			ourview.vdir[0], ourview.vdir[1], ourview.vdir[2]);
 	(*dev->comout)(buf);
 	(*dev->comin)(buf);
 	if (buf[0] == CTRL(C)) return;
-	if (sscanf(buf,"%lf %lf %lf",&nv.vdir[0],&nv.vdir[1],&nv.vdir[2]) != 3)
+	if (sscanf(buf,"%lf %lf %lf",&nv.vdir[0],&nv.vdir[1],&nv.vdir[2]) == 3)
+		change++;
+	else
 		VCOPY(nv.vdir, ourview.vdir);
 	sprintf(buf, "view up (%.6g %.6g %.6g): ",
 			ourview.vup[0], ourview.vup[1], ourview.vup[2]);
 	(*dev->comout)(buf);
 	(*dev->comin)(buf);
 	if (buf[0] == CTRL(C)) return;
-	if (sscanf(buf,"%lf %lf %lf",&nv.vup[0],&nv.vup[1],&nv.vup[2]) != 3)
+	if (sscanf(buf,"%lf %lf %lf",&nv.vup[0],&nv.vup[1],&nv.vup[2]) == 3)
+		change++;
+	else
 		VCOPY(nv.vup, ourview.vup);
 	sprintf(buf, "view horiz and vert size (%.6g %.6g): ",
 			ourview.horiz, ourview.vert);
 	(*dev->comout)(buf);
 	(*dev->comin)(buf);
 	if (buf[0] == CTRL(C)) return;
-	if (sscanf(buf, "%lf %lf", &nv.horiz, &nv.vert) != 2) {
+	if (sscanf(buf, "%lf %lf", &nv.horiz, &nv.vert) == 2)
+		change++;
+	else {
 		nv.horiz = ourview.horiz; nv.vert = ourview.vert;
 	}
 	sprintf(buf, "x and y resolution (%d %d): ",
@@ -132,10 +142,13 @@ char  *s;
 	(*dev->comout)(buf);
 	(*dev->comin)(buf);
 	if (buf[0] == CTRL(C)) return;
-	if (sscanf(buf, "%d %d", &nv.hresolu, &nv.vresolu) != 2) {
+	if (sscanf(buf, "%d %d", &nv.hresolu, &nv.vresolu) == 2)
+		change++;
+	else {
 		nv.hresolu = ourview.hresolu; nv.vresolu = ourview.vresolu;
 	}
-	newview(&nv);
+	if (change)
+		newview(&nv);
 }
 
 
@@ -252,27 +265,25 @@ char  *s;
 
 	if (getinterest(s, 0, vc, &mag) < 0)
 		return;
-	moveview(0.0, mag, vc);
+	moveview(0.0, 0.0, mag, vc);
 }
 
 
 getrotate(s)				/* rotate camera */
 char  *s;
 {
-	extern double  normalize();
+	extern double  normalize(), tan(), atan();
 	VIEW  nv;
 	FVECT  v1;
-	double  angle, elev;
+	double  angle, elev, zfact;
 	
-	elev = 0.0;
-	if (sscanf(s, "%lf %lf", &angle, &elev) < 1) {
+	elev = 0.0; zfact = 1.0;
+	if (sscanf(s, "%lf %lf %lf", &angle, &elev, &zfact) < 1) {
 		error(COMMAND, "missing angle");
 		return;
 	}
-	nv.type = ourview.type;
 	VCOPY(nv.vp, ourview.vp);
 	VCOPY(nv.vup, ourview.vup);
-	nv.horiz = ourview.horiz; nv.vert = ourview.vert;
 	nv.hresolu = ourview.hresolu; nv.vresolu = ourview.vresolu;
 	spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
 	if (elev != 0.0) {
@@ -280,6 +291,15 @@ char  *s;
 		normalize(v1);
 		spinvector(nv.vdir, nv.vdir, v1, elev*(PI/180.));
 	}
+	if ((nv.type = ourview.type) == VT_PAR) {
+		nv.horiz = ourview.horiz / zfact;
+		nv.vert = ourview.vert / zfact;
+	} else {
+		nv.horiz = atan(tan(ourview.horiz*(PI/180./2.))/zfact) /
+				(PI/180./2.);
+		nv.vert = atan(tan(ourview.vert*(PI/180./2.))/zfact) /
+				(PI/180./2.);
+	}
 	newview(&nv);
 }
 
@@ -288,15 +308,16 @@ getpivot(s)				/* pivot viewpoint */
 register char  *s;
 {
 	FVECT  vc;
-	double  angle, mag;
+	double  angle, elev, mag;
 
-	if (sscanf(s, "%lf", &angle) != 1) {
+	elev = 0.0;
+	if (sscanf(s, "%lf %lf", &angle, &elev) < 1) {
 		error(COMMAND, "missing angle");
 		return;
 	}
-	if (getinterest(sskip(s), 0, vc, &mag) < 0)
+	if (getinterest(sskip(sskip(s)), 0, vc, &mag) < 0)
 		return;
-	moveview(angle, mag, vc);
+	moveview(angle, elev, mag, vc);
 }
 
 
@@ -348,11 +369,11 @@ char  *s;
 			e *= atof(cp);
 	}
 	if (p != NULL) {		/* relative setting */
-		if (intens(p->v) <= FTINY) {
+		if (bright(p->v) <= FTINY) {
 			error(COMMAND, "cannot normalize to zero");
 			return;
 		}
-		e *= 0.5 / intens(p->v);
+		e *= 0.5 / bright(p->v);
 	}
 	if (e <= FTINY || fabs(1.0 - e) <= FTINY)
 		return;
@@ -370,6 +391,7 @@ register char  *s;
 	extern double  minweight;
 	extern int  maxdepth;
 	extern double  dstrsrc;
+	extern double  shadthresh;
 	extern COLOR  ambval;
 	extern double  ambacc;
 	extern double  minarad;
@@ -382,7 +404,7 @@ register char  *s;
 	char  buf[128];
 	
 	if (s[0] == '\0') {
-		(*dev->comout)("aa ab ad ar as av ds lr lw sd sp: ");
+		(*dev->comout)("aa ab ad ar as av dj dt lr lw sd sp: ");
 		(*dev->comin)(buf);
 		s = buf;
 	}
@@ -415,17 +437,33 @@ register char  *s;
 			goto badparam;
 		}
 		break;
-	case 'd':			/* distribute source */
-		if (s[1] != 's')
+	case 'd':			/* direct */
+		switch (s[1]) {
+		case 'j':			/* jitter */
+			if (sscanf(s+2, "%lf", &d0) != 1) {
+				sprintf(buf, "direct jitter (%.6g): ",
+						dstrsrc);
+				(*dev->comout)(buf);
+				(*dev->comin)(buf);
+				if (sscanf(buf, "%lf", &d0) != 1)
+					break;
+			}
+			dstrsrc = d0;
+			break;
+		case 't':			/* threshold */
+			if (sscanf(s+2, "%lf", &d0) != 1) {
+				sprintf(buf, "direct threshold (%.6g): ",
+						shadthresh);
+				(*dev->comout)(buf);
+				(*dev->comin)(buf);
+				if (sscanf(buf, "%lf", &d0) != 1)
+					break;
+			}
+			shadthresh = d0;
+			break;
+		default:
 			goto badparam;
-		if (sscanf(s+2, "%lf", &d0) != 1) {
-			sprintf(buf, "distribute source (%.6g): ", dstrsrc);
-			(*dev->comout)(buf);
-			(*dev->comin)(buf);
-			if (sscanf(buf, "%lf", &d0) != 1)
-				break;
 		}
-		dstrsrc = d0;
 		break;
 	case 'a':			/* ambient */
 		switch (s[1]) {