BRTECH1 does support the most visual features from idtech4 already, since BRTECH1 can load already (Darkplaces-Engine-based) Nexuiz/Xonotic Maps with deluxe maps (see http://www.youtube.com/watch?v=nubjG-3Nrpg http://www.youtube.com/watch?v=Sa_9cwVnKd8 and http://www.youtube.com/watch?v=XLscohdw3X4 ), with extended material shader definitions for bump mapping, parallax mapping and relief mapping and with other known-from-idtech4 features.
And BRTECH2 will be maybe totally different then, but I'm not sure here yet.
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