Using viz.window.screenCapture in a loop?

[Jeff]

Here's an example using a task function that should capture an object before and after removing it:

import viz
import viztask

viz.go()

dojo = viz.addChild('dojo.osgb')
ball = viz.addChild('beachball.osgb', pos=[0,1.8,2])

def screenCaptureTask():
	viz.window.screenCapture('Before.png')
	yield viztask.waitFrame(1)
	ball.remove()
	viz.window.screenCapture('After.png')

viztask.schedule( screenCaptureTask() )