Those set the min and max texture resolution to use and also the LOD bias, 0 is neutral and means to use the original texture and then use LOD1 up to whatever level is used (12 being max I believe, each step halving the texture resolution so 512 down to 256 and so as the textured object gets further from the player to put it simple.) TEXTUREGROUP_World=(MinLODSize=256,MaxLODSize=512,LODBias=0) (Or BioEngine.ini directly if Coalsced is taken apart first, heh.)
To be more specific I'm fairly certain it was due to all these types of values in the Engine section of that INI file.
