how do i create a portal to an alternate dimension/scene

:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By XavierH622

I’m creating a 3D game with voxel terrain and I’d like to add portals to other (pocket) dimensions that the player can see through. I know it’s possible to create portals like https://www.youtube.com/watch?v=i5HCvcbZRQw but this requires the portal to be somewhere else in the scene. my voxel world will be infinite (or rather as close to it as possible) in size (both vertically and horizontally) so putting
this alternate dimension elsewhere in the world-space just doesn’t seem like an option. for instance is there a way to create a portal to another (3d) scene that the player can see through?