I posted something along these line in the advanced users forum, praising the
amazing user_defined camera.

I've now implemented the code for both cylindrical and equirectangular, it can
be found here
   https://paulbourke.net/stereoscopy/pov_odsp/

The equirectangular version is more common for head mounted displays. Whereas
I'm working more with cylindrical displays, hence the cylindrical variant. I
include support for both commonly encountered zero parallax options, infinity
for HMDs or at the screen distance for displays.

One of the important things about this solution is that it is defined in terms
of real world coordinates. As such the scene should ideally also be defined in
terms of the same units. This is important for good quality stereographics and
being able to represent true scale and depth. And critical when it comes to
compositing with other stereoscopic sources, like 360 stereoscopic cameras.

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