--- ray/src/hd/rhd_x11.c	1998/01/01 13:00:15	3.20
+++ ray/src/hd/rhd_x11.c	1998/01/06 05:26:19	3.23
@@ -174,8 +174,8 @@ char  *id;
 	dev_input();			/* sets size and view angles */
 					/* allocate our leaf pile */
 	if (!qtAllocLeaves(DisplayWidth(ourdisplay,ourscreen) *
-			DisplayHeight(ourdisplay,ourscreen) /
-			(qtMinNodesiz*qtMinNodesiz)))
+			DisplayHeight(ourdisplay,ourscreen) * 3 /
+			(qtMinNodesiz*qtMinNodesiz*2)))
 		error(SYSTEM, "insufficient memory for leaf storage");
 	odev.name = id;
 	odev.ifd = ConnectionNumber(ourdisplay);
@@ -199,6 +199,16 @@ dev_close()			/* close our display */
 }
 
 
+
+dev_clear()			/* clear our quadtree */
+{
+	qtCompost(100);
+	if (ncolors > 0)
+		new_ctab(ncolors);
+	rayqleft = 0;			/* hold off update */
+}
+
+
 int
 dev_view(nv)			/* assign new driver view */
 VIEW	*nv;
@@ -604,6 +614,7 @@ register XKeyPressedEvent  *ekey;
 		if (ncolors > 0)
 			new_ctab(ncolors);
 		inpresflags |= DFL(DC_REDRAW);	/* resend values from server */
+		rayqleft = 0;			/* hold off update */
 		return;
 	case 'K':			/* kill rtrace process(es) */
 		inpresflags |= DFL(DC_KILL);