[vtkusers] GPU Volume Render partial update.

[zlf]

I have a volume. Rendered by volume renderering. 

The volume data is updated frequently. About 10 times per second. Every
time, about 5% of its data is changed.

I want the renderering result update fast. Apparently, the performance of
whole refresh every time cannot satisfy. I am wondering whether vtk volume
renderering supports partially update?

Thanks

superZZ

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