--- ray/src/rt/rv2.c	1989/06/08 17:04:40	1.8
+++ ray/src/rt/rv2.c	1989/07/27 22:58:26	1.10
@@ -65,6 +65,8 @@ char  *s;
 	if (pframe.d < 0) pframe.d = 0;
 	if (pframe.r > ourview.hresolu) pframe.r = ourview.hresolu;
 	if (pframe.u > ourview.vresolu) pframe.u = ourview.vresolu;
+	if (pframe.l > pframe.r) pframe.l = pframe.r;
+	if (pframe.d > pframe.u) pframe.d = pframe.u;
 	pdepth = 0;
 }
 
@@ -74,12 +76,12 @@ char  *s;
 {
 	FILE  *fp;
 	char  buf[128];
-	char  *fname, *getpath();
+	char  *fname;
 	int  change = 0;
 	VIEW  nv;
 
 	if (sscanf(s, "%s", buf) == 1) {	/* write parameters to a file */
-		if ((fname = getpath(buf, NULL)) == NULL ||
+		if ((fname = getpath(buf, NULL, 0)) == NULL ||
 				(fp = fopen(fname, "a")) == NULL) {
 			sprintf(errmsg, "cannot open \"%s\"", buf);
 			error(COMMAND, errmsg);
@@ -156,13 +158,13 @@ lastview(s)				/* return to a previous view */
 char  *s;
 {
 	char  buf[128];
-	char  *fname, *getpath();
+	char  *fname;
 	int  success;
 	VIEW  nv;
 
 	if (sscanf(s, "%s", buf) == 1) {	/* get parameters from a file */
 		bcopy(&stdview, &nv, sizeof(VIEW));
-		if ((fname = getpath(buf, NULL)) == NULL ||
+		if ((fname = getpath(buf, NULL, 0)) == NULL ||
 				(success = viewfile(fname, &nv)) == -1) {
 			sprintf(errmsg, "cannot open \"%s\"", buf);
 			error(COMMAND, errmsg);
@@ -392,6 +394,7 @@ register char  *s;
 	extern int  maxdepth;
 	extern double  dstrsrc;
 	extern double  shadthresh;
+	extern double  shadcert;
 	extern COLOR  ambval;
 	extern double  ambacc;
 	extern double  minarad;
@@ -404,7 +407,7 @@ register char  *s;
 	char  buf[128];
 	
 	if (s[0] == '\0') {
-		(*dev->comout)("aa ab ad ar as av dj dt lr lw sp st: ");
+		(*dev->comout)("aa ab ad ar as av dc dj dt lr lw sp st: ");
 		(*dev->comin)(buf);
 		s = buf;
 	}
@@ -450,6 +453,17 @@ register char  *s;
 			}
 			dstrsrc = d0;
 			break;
+		case 'c':			/* certainty */
+			if (sscanf(s+2, "%lf", &d0) != 1) {
+				sprintf(buf, "direct certainty (%.6g): ",
+						shadcert);
+				(*dev->comout)(buf);
+				(*dev->comin)(buf);
+				if (sscanf(buf, "%lf", &d0) != 1)
+					break;
+			}
+			shadcert = d0;
+			break;
 		case 't':			/* threshold */
 			if (sscanf(s+2, "%lf", &d0) != 1) {
 				sprintf(buf, "direct threshold (%.6g): ",
@@ -641,7 +655,7 @@ writepict(s)				/* write the picture to a file */
 char  *s;
 {
 	static char  buf[128];
-	char  *fname, *getpath();
+	char  *fname;
 	FILE  *fp;
 	COLR  *scanline;
 	int  y;
@@ -650,7 +664,7 @@ char  *s;
 		error(COMMAND, "no file");
 		return;
 	}
-	if ((fname = getpath(buf, NULL)) == NULL ||
+	if ((fname = getpath(buf, NULL, 0)) == NULL ||
 			(fp = fopen(fname, "w")) == NULL) {
 		sprintf(errmsg, "cannot open \"%s\"", buf);
 		error(COMMAND, errmsg);