[vtkusers] GLEW with VTK

[Cory Jones]

I am using vtkSmartVolumeMapper to render a volume that is 4-channel of
size 512x512x256. In an attempt to speed up rendering times, I recently
switched to using OpenGL2 by changing the VTK_RENDERING_BACKEND variable to
OpenGL2 and enabling module_vtkglew. In spite of this I am still seeing
rendering times of about 15 seconds. Are there any recommendations for
improving rendering times?

Thanks.

Cory
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