[vtkusers] vtkExtractVOI help!

[X. Chi]

Hi, all

I have a vtkImageData and I use contour filter to create the 3D surface 
rendering. Due to the large set of data, I am trying to use vtkExtractVOI 
for local updating. But the problem is that vtk does not keep the 
vtkExtractVOI history. For example, when extracting part A of the whole 
image data (by moving the probe into that area), A will be displayed. But 
while extracting part B of the whole image data, part A would not be 
displayed, only part B is displayed. Can anybody tell me how I can keep the 
history of VOI?

Thanks.

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