screen reference frame for stereo

[Jerry]

Here is one way:

from viz import *

go(STEREO)

scene(1, LEFT_EYE)
scene(2, RIGHT_EYE)

x = add(TEXT3D,'duck',SCREEN,1)
x1 = add(TEXT3D,'duck',SCREEN,2)

g = add('duck.wrl',WORLD,1)
g.duplicate(2)

g.translate(0,1.8,4)

Here the text message is added to the screen in both scene 1 and scene 2.
Any objects added to the world must be duplicated, as shown, in order to
appear in both eyes.