[vtkusers] Render several RenderWindows synchronously

[zlf]

Hi

I have three RenderWindows. Each has a volume mapper. Assume volume mapper
is very slow. 

So if I try to refresh the three one by calling rw1.Render(); rw2.Render();
rw3.Render();, the result will be rw1 refresh, wait for N seconds, rw2
refresh, wait for N seconds, rw3 refresh.

This makes the program looks very asynchronously. How to make the three
RenderWindows refresh at the same time?

Regards.

zlf

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