I've been trying to get depth information from a scene using both the raw
f_output_depth feature as well as the PP_Depth macro. Here are some of the
samples:

Actual depth      pixel value
25                     35
50                     53
100                    72
150                    88

This is based on using a depth range of 0->1500

This is obviously non-linear - but not referenced anywhere in the documentation
and I can't find it via google. Does anyone know how the conversion from the
actual distance from the camera to the object is converted into a value in
f_output_depth???

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