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diff --git a/Demo/sgi/gl/zrgb.py b/Demo/sgi/gl/zrgb.py
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+#! /usr/local/python
+
+#   zrgb  (Requires Z buffer.)
+#
+# This program demostrates zbuffering 3 intersecting RGB polygons while
+# in doublebuffer mode where, movement of the mouse with the LEFTMOUSE 
+# button depressed will, rotate the 3 polygons. This is done by compound
+# rotations allowing continuous screen-oriented rotations. 
+#
+#    Press the "Esc" key to exit.  
+
+from gl import *
+from GL import *
+from DEVICE import *
+
+
+idmat=[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1]
+
+def main() :
+	#
+	# old and new mouse position
+	#
+	#
+	mode = 0
+	omx = 0
+	mx = 0
+	omy = 0
+	my = 0
+	#
+	objmat=[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1]
+	#
+	initialize ()
+	#
+	draw_scene (objmat)
+	#
+	while (1) :
+		#
+		dev, val = qread()
+		#
+		if dev == ESCKEY :
+			if val :
+				break	
+			# exit when key is going up, not down
+			# this avoids the scenario where a window 
+			# underneath this program's window
+			# would otherwise "eat up" the up-
+			# event of the Esc key being released
+			return        
+			#
+		elif dev == REDRAW :
+			reshapeviewport()
+			draw_scene(objmat)
+			#
+		elif dev == LEFTMOUSE:
+			omx = mx
+			omy = my
+			if val :
+				mode = 1
+			else :
+				mode = 0
+		elif dev == MOUSEX :
+			omx = mx
+			mx = val
+			#print omx, mx
+			objmat = update_scene(objmat,mx,my,omx,omy,mode)
+			#
+		elif dev == MOUSEY :
+			omy = my
+			my = val
+			#print omy, my
+			objmat = update_scene(objmat,mx,my,omx,omy,mode)
+			#
+
+
+def initialize () :
+	#
+	foreground ()
+	keepaspect(5, 4)
+	w = winopen('Zbuffered RGB')
+	#
+	doublebuffer()
+	RGBmode()
+	gconfig()
+	zbuffer(1)
+	lsetdepth(0x0, 0x7FFFFF)
+	#
+	qdevice(ESCKEY)
+	qdevice(LEFTMOUSE)
+	qdevice(MOUSEX)
+	qdevice(MOUSEY)
+
+def update_scene (mat, mx, my, omx, omy, mode) :
+	#
+	if mode == 1 :
+		mat = orient(mat, mx, my, omx, omy)
+		draw_scene(mat)
+	return mat
+
+def orient (mat, mx, my, omx, omy) :
+	#
+	#
+	pushmatrix()
+	loadmatrix(idmat)
+	#
+	if mx - omx : rot (float (mx - omx), 'y')
+	if omy - my : rot (float (omy - my), 'x')
+	#
+	multmatrix(mat)
+	mat = getmatrix()
+	#
+	popmatrix()
+	#
+	return mat
+
+def draw_scene (mat) :
+	RGBcolor(40, 100, 200)
+	clear()
+	zclear()
+	#
+	perspective(400, 1.25, 30.0, 60.0)
+	translate(0.0, 0.0, -40.0)
+	multmatrix(mat)
+	#
+	# skews original view to show all polygons
+	#
+	rotate(-580, 'y')
+	draw_polys()
+	#
+	swapbuffers()
+
+polygon1 = [(-10.0,-10.0,0.0),(10.0,-10.0,0.0),(-10.0,10.0,0.0)]
+
+polygon2 = [(0.0,-10.0,-10.0),(0.0,-10.0,10.0),(0.0,5.0,-10.0)]
+
+polygon3 = [(-10.0,6.0,4.0),(-10.0,3.0,4.0),(4.0,-9.0,-10.0),(4.0,-6.0,-10.0)]
+
+def draw_polys():
+	bgnpolygon()
+	cpack(0x0)
+	v3f(polygon1[0])
+	cpack(0x007F7F7F)
+	v3f(polygon1[1])
+	cpack(0x00FFFFFF)
+	v3f(polygon1[2])
+	endpolygon()
+	#
+	bgnpolygon()
+	cpack(0x0000FFFF)
+	v3f(polygon2[0])
+	cpack(0x007FFF00)
+	v3f(polygon2[1])
+	cpack(0x00FF0000)
+	v3f(polygon2[2])
+	endpolygon()
+	#
+	bgnpolygon()
+	cpack(0x0000FFFF)
+	v3f(polygon3[0])
+	cpack(0x00FF00FF)
+	v3f(polygon3[1])
+	cpack(0x00FF0000)
+	v3f(polygon3[2])
+	cpack(0x00FF00FF)
+	v3f(polygon3[3])
+	endpolygon()
+
+
+main ()