[vtkusers] Read and resample large volumes

[leandro]

Hello David,

I have the same situation, but i don´t manage to do it with VTK without
first loading too much data into memory. Doing the way you suggested worked
even worse.
My code:

vtkImageReader2* image = vtkImageReader2::New();
			image->SetDataExtent(extent);
			image->SetDataByteOrderToLittleEndian();
			image->SetFilePrefix (prefix);
			image->SetDataSpacing(spacing);
			
vtkImageShrink3D *shrink = vtkImageShrink3D::New();
	shrink->SetInputConnection(streamer->GetOutputPort());
	shrink->SetShrinkFactors(2,2,2);

vtkImageDataStreamer* streamer = vtkImageDataStreamer::New();
	streamer->GetOutput()->GlobalReleaseDataFlagOn();
	streamer->SetInputConnection(image->GetOutputPort());
	streamer->SetNumberOfStreamDivisions(10);
	mapper -> SetInput(streamer->GetOutput());

The data is 700MB big. Resampled to the half it costs 250MB memory (done
without streaming and loads max. 795MB). But with this code it firsts need
almost 800MB then explodes to 2GB =(
I don´t get it, where is the mistake?

Thank you

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