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Unity isn't exactly "open," it's actually closed source which can be a big pain if something goes wrong. Compared to traditional game development where usually you have access to all the source it is a big pain (for me at least).

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> Compared to traditional game development where usually you have access to all the source it is a big pain (for me at least).

Which commercial engines do offer full source code access?

All of them? It's unheard of at a AAA development level to sell an engine without full source access; CryENGINE, Unreal, iD Tech, and Gamebryo all offer full source licenses, to name a few examples.

Thanks for the info.

Any 3rd party engine used by a AAA game will have full source. Unreal Engine, Crytek, Source, etc. Sometimes those engines have cheap, no-source indie targeted licenses but the high end games paying the high price tag has source.

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