Attached is a sample source-code file from POV-Ray 3.7 - cones.cpp. This is
an example of what we'd need to convert for 4.0 - all the code would need
to be stripped out and re-implemented with the same functionality (this
does not mean that it has to do things the same way - e.g. someone might
have ideas of how to do it more efficiently - but otherwise it's a matter
of understanding how the original code works and making a new version).

-- Chris

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