That tutorial I linked to in another post should help to explain how to do that.
That tutorial works best for simple roofs though. The trick is when you import the saved obj file that you created using walls. When importing you have to rotate it to get it like you want.
Life in the US used to be a lot better. It's rapidly going downhill, in my opinion.
I don't think this is the place to discuss that though.
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Hawk
