[vtkusers] Stack of different vtkImageData in a single vtkImageData

[Jesús Spí­nola]

Hi,

I have several vtkImageData objects that contain different screenshots from
a render window ( they are all 2D images ). Then I want to write this set of
images to a files like png, jpeg, etc. I would like to merge all this
singular 2D vtkImageData in one 3D vtkImageData ( like a stack of 2D images
) to pass it as input to a writer class.

How can I do this merge with vtk?
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