--- ray/src/rt/rview.c	1993/09/07 16:11:12	2.12
+++ ray/src/rt/rview.c	1994/12/21 09:52:07	2.14
@@ -41,6 +41,8 @@ double	srcsizerat = 0.;		/* maximum ratio source size/
 double	specthresh = .3;		/* specular sampling threshold */
 double	specjitter = 1.;		/* specular sampling jitter */
 
+int  backvis = 1;			/* back face visibility */
+
 int  maxdepth = 4;			/* maximum recursion depth */
 double	minweight = 1e-2;		/* minimum ray weight */
 
@@ -226,8 +228,13 @@ again:
 		getexposure(args);
 		break;
 	case 's':				/* set a parameter */
-		if (badcom("set"))
+		if (badcom("set")) {
+#ifdef	SIGTSTP
+			if (!badcom("stop"))
+				goto dostop;
+#endif
 			goto commerr;
+		}
 		setparam(args);
 		break;
 	case 'n':				/* new picture */
@@ -261,16 +268,23 @@ again:
 		break;
 	case 'r':				/* rotate/repaint */
 		if (badcom("rotate")) {
-			if (badcom("repaint"))
-				goto commerr;
+			if (badcom("repaint")) {
+				if (badcom("redraw"))
+					goto commerr;
+				redraw();
+				break;
+			}
 			getrepaint(args);
 			break;
 		}
 		getrotate(args);
 		break;
 	case 'p':				/* pivot view */
-		if (badcom("pivot"))
-			goto commerr;
+		if (badcom("pivot")) {
+			if (badcom("pause"))
+				goto commerr;
+			goto again;
+		}
 		getpivot(args);
 		break;
 	case CTRL('R'):				/* redraw */
@@ -288,7 +302,8 @@ again:
 	case CTRL('C'):				/* interrupt */
 		goto again;
 #ifdef	SIGTSTP
-	case CTRL('Z'):				/* stop */
+	case CTRL('Z'):;			/* stop */
+dostop:
 		devclose();
 		kill(0, SIGTSTP);
 		/* pc stops here */