[vtkusers] how to measure the real depth with VTK

[dev]

Hi everyone,

I measured the depth maps of a 3D object, by placing some virtual cameras in
front of it. I get a depth value *z* of a point of coordinates,for example,
(235.2,340.7), by using *GetZbufferDataAtPoint* method from the render
window.

Now I want to compute the real *z **(the real depth)* of this point, how can
I do that?
Please help !

Thank you.

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