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I've never played the game, but your description doesn't sound very hard to implement. Keep in mind there is no physical camera when rendering, so tricks like this become rather easy to implement. You just setup the camera appropriately and render the perspective being shown by the portal, transformed into view space, using an alpha mask to make sure it only draws pixels where the glass fragment is.

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Isn't the more common usage of this in skyboxes? You'd have one area where the gameplay is taking place, then another area in the map that shows the larger scale area surrounding where the player is and the portal makes it appear that the gameplay area is within the other.

The designer needs to confine the player so they can't break the illusion (where Prey lets Morgan Yu shatter that 4th wall), or you can do things like put the player on a speeding train traveling through a scenery and falling off is fatal

I’m old. For me a skybox is what it says on the tin: a box with a fisheye texture that when rendered looks like a 360 panorama. Does the word mean rendering actual geometry now?

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