Hey Kenneth:

Have you seen this? (mesh projection camera)
https://wiki.povray.org/content/Reference:Camera

Max Distance
This is an optional floating-point value which, if greater than EPSILON (a very
small value used internally for comparisons with 0), will be used as the limit
for the length of any rays cast. Objects at a distance greater than this from
the ray origin will not be intersected by the ray.

The primary use for this parameter is to allow a mesh camera to 'probe' a scene
in order to determine whether or not a given location contains a visible object.
Two examples would be a camera that divides the scene into slices for use in 3d
printing or to generate an STL file, and a camera that divides the scene into
cubes to generate voxel information. In both cases, some external means of
processing the generated image into a useful form would be required.

- bw

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