[vtkusers] VTK performance with 1000's of actors

[Andrew Cunningham]

HI Martin,
I noted this problem in VTK 5.4, and did some diagnosis. The very poor
performance with many actors , can be due, I would argue , to a n! ( n
factorial) issue in the handling of sub-objects of a vtkAssembly when
checking the modification time.

See my post at
http://public.kitware.com/pipermail/vtkusers/2009-May/100928.html

Basically VTK 5.x is terrible at handling complex scene graphs. Try and
flatten your scene.

I switched to using OpenSceneGraph , which  handles extremely complex scene
graphs very efficiently as well as proper handling of state inheritance, and
can be interfaced to VTK algorithms

Andrew
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