Hi I'm having trouble with a boolean subtraction. I have a plane as a wall and I want to put a window in it. I create a cube and position it in the wall (plane). I select both and go to edit > 3d boolean. I fill out the dialog box- plane minus cube. I get the subtraction but not in the shape of the cube- in fact, depending on the quality of sillhoette, the shapes are pretty weird! What am I doing wrong, please? Thanks for any help! Daf