hierarchical models / physic shapes problem in Viz4

[Jeff]

For nodes to react correctly in the physics simulation they should be children of the world. This is the case for both Vizard 3 and Vizard 4 and you'll see a strange result if you enable viz.PHYSICS for the subNodes. If you remove the subNodes' collide shapes they will fall with the mainNode just as they do with the current script when run in Vizard 3.