Portals are now finished, as per the above.

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I did mess around with some shaders to morph the image inside the portal but it didn't look right in the end so I'm just leaving it as it is. The image inside the portal is just a static texture as I'm not going to get too complicated.

Like all other entities, the portals can be sent a 1 to open or a 0 to close, and a -1 to close and vanish, meaning they integrate into the existing system really easily.

There is now a method in the script to send signals to objects by their IDs, so the portals can be controlled by pretty much anything now.

Hope you likey. Nighty night.