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Other than the doom3 mods, is it possible for example to run Quake 4 or Prey using the game data?

Let's say that I purchase Quake 4 or Prey (or any other idTech 4 game) can I just point to the game data path and run it with the source code? Is there any modification needed? If so, what is it?

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up vote 5 down vote accepted

Doubtful. Almost certainly these games involved some code changes, whether minor or major. It would be very unusual if Quake 4 or Prey shipped with the exact Doom 3 code-base, replacing only the art assets and scripts. I'd be surprised if the Doom 3 code will run these games correctly. But since Quake 4 and Prey have not themselves been open-sourced (and may never be), you may be out of luck, unless you feel up to the task of reverse-engineering any code modifications that were made.

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Fairly certain that Quake 4 used Cg shaders whereas Doom 3 used the older assembly language extensions. – Le Comte du Merde-fou Jan 27 '12 at 0:38
Yeah... I was expecting that to be the case. I guess my question should be, is there any other game that uses the engine without modifications? Probably the answer is also no. – cloudraven Jan 27 '12 at 0:41

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