Simple Answer: Custom and selected when generating a World.
Complicated Answer: I really need to test that myself once I actually have something to do Worldgen so I can get a nice Default Size.
Did you know you can run a Magnetic Pipe through the center of the Torus and accelerate liquid Metal inside it to stabilize Gravity and the entire Structure of the Torus itself?
Oh right I did not think about those at all. XD
I dont think I will do actually movable Tectonic Plates, though having Boundaries and a Vector might be good for determining which places are Volcanoes/Mountains and which aren’t.
The Planet is going to be artificial in Nature, because a Torus Planet is so super unlikely to ever exist, and so unstable, that it would not make sense to be any other way.
Definitely seeded by a space faring Civilization, but in a way that seems actually realistic to the inhabitants. Animals and Stuff will just procedurally generate in an Earth alike way but ofcourse always fitting nice to the environment they are spawned in.
And all the Space Tech is well hidden on the Planet, including from 99.9% of the NPC inhabitants. The Players all know that they are “Players”, there is no reason to hide that fact from them, since they always know.
The Space Tech is so advanced that it could even be used like a Magic System to people who dont exactly know what the Stuff is actually doing behind the Scenes.
That Tech could even lead to a Religion, considering how it might be used to revive Players and such, but it would be a kindof functioning one, since “Magic” exists and might be triggerable only by people with a certain moral mindset and/or reasoning, depending on which “Magic Object” it is, especially if it is an actual Space Tech Weapon with all the built in Mind Reading Security Functionality still enabled.
Your Map is indeed very similar to what I had in mind, maybe even a little bit more expansive than what I thought about. XD