[vtkusers] How to blend multiple images form vtkImageData

[Felipe de Souza]

Hi!!!
I'm trying blending multiple images with VTK,
but they're disappearing.
I saw vtkImageBlend join perfectly two images, when I join
more image, the initial images are disappearing.
I note in vtkImageBlend's Code, when I modify the second image's opacity,
the first image's opacity changes too.

Another problem, it's I don't know how to get a shape from vtkImageData,
because they stay in diferent levels (altitude).
So when I try blending the images,
they're not joined.
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