[farshizzo]

You can apply the toon modifier to a group node and parent/unparent the ball from the group node to toggle toon shading. Here is some sample code:

import viz
viz.go()

#Create group node for rendering in toon mode
toon = viz.add('toon.dlm')
toonGroup = viz.addGroup()
toonGroup.modify(toon)

#Create ball underneath toon node
ball = viz.add('ball.wrl',parent=toonGroup,pos=(0,1,5))

#Unparent ball from toon node when spacebar pressed
vizact.onkeydown(' ',ball.parent,viz.WORLD)