You can turn off viewpoint collision for a single object using the
<node3d>.disable command with the
viz.INTERSECTION flag:
Code:
import viz
viz.go()
viz.collision(viz.ON)
dojo = viz.add('dojo.osgb')
ball = viz.add('beachball.osgb',pos=[0,1.8,3])
ball.disable(viz.INTERSECTION)