If you know where your camera is in POVray (in coordinates or units) and you
also know where your object is, the distance is sqrt( (x2 - x1)^2 + (y2 - y1)^2
+ (z2 - z1)^2 ), the old and venerable Pythagorean theorem.
    <x1, y1, z1> should be your camera location, and <x2, y2, z2> should be your
object location.

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip

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