Triangle planes in level editor?

[Josh9810]

f the OP needs the player to be able to go inside and look around, then, generally speaking, it's not going to look very realistic - but with some effort I suppose it can turn out to be at least decent looking).

This is what I was using it for
It looks good so far its just I need a triangle plane to help with the side of the roof the flat parts look good and perfect.