I'm sure you know how a game engine is evolved and the different functions and abilities added over time.
Generally these are more than just tweaks but even so that's enough sometimes anyway.
So you can nickname it BHD or DFX2 if you like but the engine used for DFX2 is worlds apart from the version used in BHD.
Here's some brief info on the engine origins.
https://en.wikipedia.org/wiki/Voxel_Space
Quote:
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Voxel Space was a voxel raster graphics rendering engine invented by Novalogic developer and vice-president of technology, Kyle Freeman. The company was issued a patent for the technology in early 2000
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