--- ray/src/hd/rhd_glx.c	1997/12/26 15:33:12	3.6
+++ ray/src/hd/rhd_glx.c	1997/12/26 21:56:43	3.8
@@ -161,7 +161,6 @@ char  *id;
 					/* map the window */
 	XMapWindow(ourdisplay, gwind);
 	dev_input();			/* sets size and view angles */
-	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 					/* allocate our leaf pile */
 	if (!qtAllocLeaves(2 * DisplayWidth(ourdisplay,ourscreen) *
 			DisplayHeight(ourdisplay,ourscreen) /
@@ -567,12 +566,20 @@ register XKeyPressedEvent  *ekey;
 		inpresflags |= DFL(DC_RESUME);
 		return;
 	case CTRL('R'):			/* redraw screen */
+		if (nxtzmax > FTINY) {
+			curzmax = nxtzmax;
+			nxtzmax = 0.;
+		}
 		glClear(GL_DEPTH_BUFFER_BIT);
 		qtRedraw(0, 0, odev.hres, odev.vres);
 		return;
 	case CTRL('L'):			/* refresh from server */
 		if (inpresflags & DFL(DC_REDRAW))
 			return;
+		if (nxtzmax > FTINY) {
+			curzmax = nxtzmax;
+			nxtzmax = 0.;
+		}
 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 		draw_grids();
 		glFlush();