[vtkusers] how to grap the z-buffer (depth image)

[dev]

Hi everyone, 

I'm newer on VTK, I have a question if you could answer me please: 

I have a 3D cloud (vertices and facets) I want to grap the image depth
(z-buffer) values from this 3D cloud, knowing that this 3D cloud is captured
by 4 cameras!
So I want to grap the depth map for every camera.. is it feasible?

Any help will be appreciated..

Cheers

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