[vtkusers] vtkInteractorStyleTrackballCamera: panning gets heavy then goes into reverse

[Tim Hutton]

I've an odd problem with panning in vtkInteractorStyleTrackballCamera.
Above a certain threshold of complexity, panning (holding down shift and
left-dragging) will stop working properly. With more items the scene can no
longer be dragged around far enough - it feels like it is has got heavy and
stays in the middle. With even more items the panning actually pulls in the
opposite direction. Attached an image of such a scene - it's pretty
reasonable and renders reasonably fast.

I've tested it in VTK 5.10.1 and 6.0.0 and it happens in both.

I've tested on Windows 7 and Windows 8 and Linux (Ubuntu 13.10) and
strangely it only happens on Windows (both 7 and 8).

Has anyone seen this problem before?

-- 
Tim Hutton - http://www.sq3.org.uk - http://profiles.google.com/tim.hutton/
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