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It makes the process faster.
Having done some 3D modelling (strictly hobby based though) the usual process is:
- Model the thing you're doing up to the detail level you want it for your game
- start baking normals/lighting/bumpmaps/textures and optimize it for lower polycount
Actually being able to completely skip the second step is... huge.
Now you can completely choose the detail level of a 3d model and don't need to worry how your level of detail or polycount negatively affects the rendertime. - Model the thing you're doing up to the detail level you want it for your game
I guess the whole point of the stuff they're talking about is that it make it easier/faster(?) to import models and whatnot? I dunno.
Impressive tech demo nonetheless - even if it is just Tomb Raider with an animated wingsuit lady.