[vtkusers] what is the difference between vtk 4.x and vtk 5.0

[=?GB2312?B?tcuVRs7E?=]

hello vtkusers,
       I just update my project from vtk 4.4 to vtk 5.0, and the result if
quite different. can somebody tell me difference between vtk 4.x and vtk 5.0?

      Thanks!
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