Gosh it'd be a major FEZ moment to see the world just transition magically into a rather different 3D game!
And on the flip side, how tragic of a motif it would be for a vast 3D world to forever be locked to two dimensions. Someone should make a film about this!
I'd say the best luck you would have to get an effect like this is to modify something already 3D like Minecraft.
But even so, there are definitely some things that can't totally work 1:1. There are directional-dependent elements, or things with behavior that have dimension-based polarity, if that makes any sense. To name a few like that: conduits, redstone, water flow, minecarts, and portals all have some interesting differences when you add or remove a dimension. And, well, the shape of every object differs - every flat image would need to become a 3D object made of many images, woah! ^^
Would you have to generate a 3D world for every 2D one? If you terraformed a mountain in 2D, how would that look when going back to 3D? How would you ever pick a good slice of your 3D world to forever see in 2D?
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