[vtkusers] Z-buffer to Depth: formula

[Atul Kumar]

Thank you so much David. I will try vtkRenderer::ViewToWorld().

To Dev

vtkRenderer::GetZBufferData() gives us the depth map values which ranges
from 0 to 1, so it is not the actual depth value at the pixels. To get the
actual depth at pixels we need to convert Z-buffer into actual depth
values. So, for this we need a conversion formula. I hope this makes it
clear.

Regards,
Atul
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