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A tricky part is subset of features that make the engine 'little', this subset is probably different from project to project. Easy to use (eats whatever data) or performant (data laid out and organized in a particular way), needs editor, physics, scripting, custom shading or not?
Physics, yes. Scripting, probably. Editor, not essential in the short term. And the subsets I’ve seen have significant overlap. The emphasis is on not being a black box.
