if you mean fake buildings as in building that can't be entered or seen into, choose C you'll only have 6 faces
if it's housable, choose A, as B has an extra two faces that'll need to be textured
with 4 walls a floor and a roof,
A will have 11 textured faces 25 untextured faces
B will have 15 textured faces 21 untextured faces
C will have 5 textured faces 1 untextured face
but bear in mind, you will not be able to enter C, or use see-through windows
hope this helps, prob not cos it's all foreign 2 me :-/
Yep, A and C. The number of faces to be drawn (face count) is what is important to FPS. Building B has nine faces, and A & C have only 5.
Bevelling the corners helps to reduce the face count by one at each corner (in buildings with texture inside). And, the textures will fit on the faces better.
even though they're being caulked they still intefere with visdata,
use C whereever possible then A, never B
and always with roofs and floors, have them inside the building, unless they're triangular, otherwise you'll end up with the same outcome as B again where all 6 faces will need to be textured
hope this helps, prob not cos it's all foreign 2 me :-/