[Papervision3D] How to control camera orientation when following an object.

[Simon Clark]

A quick question...

If I have a camera that is following a set distance behind a moving  
sphere. As it goes around my scene, the camera starts to bank,  
eventually turning completely upside down.  Is there any way to keep  
the top of the camera's field of view horizontal?  Setting  
rotationX,Y,Z seem to do nothing, I would guess since the camera is  
set to target the sphere.

Simon