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diff --git a/demo/sgi/gl/mixing.py b/demo/sgi/gl/mixing.py
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+#! /ufs/guido/bin/sgi/python
+
+# Use Gouraud shading to mix colors. Requires Z-buffer.
+# It changes the color assignments so fast that you see white.
+# Left button pauses, middle rotates the square. ESC to quit.
+# Experiment with a larger window (too slow) or smaller window (really white).
+
+from GL import *
+from gl import *
+import DEVICE
+from math import *
+
+#
+# tekenvlak : draw a square. with bgnpolygon
+#
+def tekenvlak (vc) :
+ bgnpolygon()
+ #vcarray (vc)
+ for i in vc :
+ c3f (i[1])
+ v3f (i[0])
+ endpolygon()
+
+#
+# tekendoos : draw a box
+#
+def tekendoos (col) :
+ v = [(-5.0,0.0,0.0),(0.0,5.0,0.0),(5.0,0.0,0.0),(0.0,-5.0,0.0)]
+ vc = [(v[0],col[0]),(v[1],col[1]),(v[2],col[2]),(v[3],col[1])]
+ tekenvlak (vc)
+
+#
+# initialize gl
+#
+def initgl () :
+ #
+ # open window
+ #
+ foreground ()
+ keepaspect (1, 1)
+ prefposition (100, 500, 100, 500)
+ w = winopen ('PYTHON RGB')
+ keepaspect (1, 1)
+ winconstraints()
+ #
+ # configure pipeline (2buf, GOURAUD and RGBmode)
+ #
+ doublebuffer ()
+ zbuffer (1)
+ shademodel (GOURAUD)
+ RGBmode ()
+ gconfig ()
+ #
+ # set viewing
+ #
+ perspective (900, 1, 1.0, 10.0)
+ polarview (10.0, 0, 0, 0)
+ #
+ # ask for the REDRAW and ESCKEY events
+ #
+ qdevice(DEVICE.MOUSE2)
+ qdevice(DEVICE.MOUSE3)
+ qdevice(DEVICE.REDRAW)
+ qdevice(DEVICE.ESCKEY)
+
+
+#
+# the color black
+#
+black = 0
+#
+# GoForIT : use 2buf to redraw the object 2n times. index i is used as
+# the (smoothly changing) rotation angle
+#
+def GoForIt(i) :
+ col = [(255.0,0.0,0.0), (0.0,255.0,0.0), (0.0,0.0,255.0)]
+ twist = 0
+ freeze = 1
+ while 1 :
+ if freeze <> 0 :
+ col[0],col[1],col[2] = col[1],col[2],col[0]
+ #
+ # clear z-buffer and clear background to light-blue
+ #
+ zclear()
+ cpack (black)
+ clear()
+ #
+ tekendoos (col)
+ #
+ swapbuffers()
+ #
+ if qtest() <> 0 :
+ dev, val = qread()
+ if dev = DEVICE.ESCKEY :
+ break
+ elif dev = DEVICE.REDRAW :
+ reshapeviewport ()
+ elif dev = DEVICE.MOUSE2 and val <> 0 :
+ twist = twist + 30
+ perspective (900, 1, 1.0, 10.0)
+ polarview (10.0, 0, 0, twist)
+ elif dev = DEVICE.MOUSE3 and val <> 0 :
+ freeze = 1 - freeze
+
+
+# the main program
+#
+def main () :
+ initgl ()
+ GoForIt (0)
+
+#
+# exec main
+#
+main ()