[vtkusers] Z-buffer to Depth: formula

[Atul Kumar]

Hi,
I am trying to find the depth at each pixel in the rendered window.
I have used 'GetZbufferData<http://vtk.org/doc/nightly/html/classvtkRenderWindow.html#ade6ec79f06dc182164962b88ca1d646e>
 ' function of 'vtkRenderWindow' class.
Now I wish to convert this data into real depth for each pixel of the
rendered window.
I am not sure what is the  formula for VTK to convert Zbuffer into actual
depth.

Please suggest if any of you have idea regarding that.

I will really appreciate your help.

Regards,
Atul
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