> You'd need to isolate the different layers and figure > out what should look flat and what should be 3D and *how* 3D it should look. It would > probably be simpler to rewrite an old 2D game from scratch then to convert a driver > in MAME to output a 3D image for a game that was never intended to be 3D.
Not quite true, consoles and systems intended for 2D manage layers to display what goes front (sprite layers) and what goes back (background layers). That was exactly what made Nebula to display alpha blending in a system it was not intended to work like that. Just as you can disable/enable layers in any other emulator different from MAME, you could set a deep and effect for any layer (also any tile) as happened in Nebula.
Have said that and as you said, it's unlikely that will happen in MAME. But it's possible for any other emulator to write an alternate output without the need to rewrite a game.
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