i have to create a house and cut the holes for the windows with a boole-function. it was the easiest way, but i can imagine that this is not the best way, because of of the strange geometry after this boole

by the way, after exporting the mesh i can see some darker trianges. this effect is connected with to position of the camera to this wall. if i look more from the side, this triangels are getting darker.
i optimized this mesh, recalcuted the normals and and and.... i think, the normals are the problem.
does anybody have a hint or trick?
cinema 10, indigo 1.0.6 and cindigo 1.0.6
thanks for everything!!!!!!!!!