HI. I'm trying to cut out a window for a house. The house is a polygon cube with some divided lines that i extruded to make a bay window.

I have tried selecting the house first then the window, and hte window then the house, and click boolean->difference but every time it deletes the whole house.

Wierd thing is, i have a version of the house just before i extruded all the bay windows and it works fine with that one (it's just a cube). In the new one i divided it loads and just added more edges. But I 'm not sure what i have done to cause this problem.

Anyone have any ideas?