I'm sure there's a way to fudge it. I remember in Dark Basic I coded something that would project a view of what you were seeing onto a quad, kind of like having a camera and monitor in the game world - and you could point the camera at the monitor, and have an infinity of pictures. BUT, there was delay to the updating of the monitor, so I'm not sure how you would do it in real time, if the portals were eg facing each other, or on top of each other etc.
Portal (PC)
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