How is this Portal effect achieved?

https://www.roblox.com/games/4625589564/Portal-Together?refPageId=251a822b-ac9a-4d56-b18b-eec8810934b3

In the game it shows what the portal looks like on the other side. How is this achieved?

I’m guessing it has to do with viewport frames or something, but I’m not entirely sure.

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Have you looked at this? There are place files embed in this post & the ones later on