[vtkusers] 2D Zooming

[Raphael Sebbe]

Hi all,

I have an array of tiff images loaded in VTK that I display, one slice 
at a time, 2 different ways:

- 2D, vtkActor2D/vtkImageMapper
- 3D, vtkImageActor

For the 2D display solution, I'd like to be able to zoom the image, but 
could not achieve that so far. I tried

imageMapper->UseCustomExtentsOn();
imageMapper->SetCustomDisplayExtents(extents);

but the rendered image is tiled, not zoomed.

Raphael
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