[vtkusers] Bug?:5.4.0 performance versus 5.0

[Jon Waite]

Hello,

When rendering an actor with >50,000 points with scalars on, and
transparency < 1, 5.4.0 renders < 1 fps versus the same code linked to
vtk 5.0 which performs normally.  Attached is the example code, if run
against each library, the bug is portrayed.

Thanks,
Jon
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