I have googled stereoscopic views but is not so easy .
i think moving the virtual visitor 6cm to the left or the right is the best way in SH3d to generate 2 pictures ,but you already tried that
so i cant help you


maybe the results of search can help you further ;
Sterioscopic 360panoramas

youtube vids
https://www.youtube.com/watch?v=AgW5stbchz8


Urls
https://code.blender.org/2015/03/1451/
https://www.360cities.net/help/stereo_panos
https://www.reddit.com/r/GearVR/comment ... ic_photos/
http://sideloadvr.com/detail.php?id=53
https://forums.geforce.com/default/topi ... -software/


prorgams
Gimp