Please develop a flat model to unfold the earth into a plat one

We really want to have this flat mode, because the spherical mode is hard to make a scene of a big city by art engineer. If cesiun team has no plan for the flat mode in the near future, can you give some advice on which source code file need to be modified. Thank you very much.
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Can you tell us more about how the spherical mode is difficult for an art engineer?

I don’t think I can tell you offhand how to implement yourself. You could certainly start by looking at how it works in CesiumJS.