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Diamond allows to define a stereoscopic projection using the command Display -> Picture Settings
and setting the checkmark at enabled in the Stereo group on the Projection page.
The stereoscopic projection is not supported (i.e. is ignored) by all present versions of Diamond when you create a POV-Ray scene from this stereo picture.
The main reason is that POV-Ray does not have built-in stereoscopic support and the way Diamond and POV-Ray pictures are defined is quite different.
So up to now there is unfortunately no way to create a stereo POV-Ray scene in one step from Diamond.
But there are two approaches to define a stereoscopic projection in a POV-Ray scene.
This requires exporting the POV-Ray scene to a POV file, manual editing of the POV file, and rendering inside the POV-Ray environment.
Export of a POV-Ray scene is done using the command Tools -> POV-Ray -> Create Scene File
and launching the POV-Ray environment with Tools -> POV-Ray -> Launch Environment.
(Note: The following suggestions have been created with the help of Microsoft Copilot.)
By editing and running the exported POV-Ray scene in the POV-Ray environment, you can achieve stereoscopic projection by setting up two cameras - one for each eye -
and carefully adjusting their positions and viewing angles.
One approach is to create left-right image pairs by defining two slightly offset cameras that mimic human eye separation.
You can then render both views separately and combine them into a stereoscopic image.
Another method involves rendering a wider symmetric frustum that contains the desired asymmetric frustum and trimming the extra image columns.
For a detailed setup, you should check out this guide:
http://www.triplespark.net/render/stereo/create.html
or this explanation:
https://paulbourke.net/stereoscopy/vpac/povray.html
for more insights!
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