[vtkusers] How to stay focused and level with an actor

[Paul Tait - OPES]

Hi VTKers

With the following code I'm trying to follow a moving actor, but the
result I get is 
A) the actor moves    yahoo
B) the focal point is set to actor and it nows becomes the centre of
movement  yahoo
C) when I re-render the scence I'm looking down on the actor from above
booooooo


How do I remain at the same level as the actor ?


 CellBottomActor->AddPosition(0, 0, diff);
 double vp    = Renderer->GetActiveCamera()->GetViewAngle();
 
Renderer->GetActiveCamera()->SetFocalPoint(Threed->vtkCells[picked]->Get
Center());
 Renderer->GetActiveCamera()->GetViewAngle(vp); 

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