The best method would be to simply remove the texture containing the horizontal lines. The following sample shows how to accomplish this:
Code:
import viz
viz.go()
pit = viz.add('pit.osgb')
# Apply texture to screen
image = viz.add('images/tile_wood.jpg')
pit.texture(image, node='screen')
# Remove screen line texture
pit.texture(0, node='screen', unit=1)