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Cutting out backing
I have a picture frame that looks like this:
What I need to do is get a part that represents the "backing". It would be exactly the shape of the outside perimeter of this frame. But it has to be generated from the actual drawing; the designer may yet tweak various parameters of the curves or angles of the corner stones. The shapes of the corner stones and the curved sides will be cut with a CNC router from a simulated-stone material; the backing will be 3/16" steel or aluminum plate, cut by a CNC plasma cutter. So I need a part description I can send to the plasma cutter (its software accepts a variety of drawing formats from which it generates the G-codes). I tried the Boolean operator, but it can't work if the parts don't intersect, which they don't. The backing will be a solid piece, and the black shapes near the corners are where that backing (which the designer will paint black) shows through. To get it, I just put a rectangular piece on the back, but we need a piece exactly the shape of the outline that follows the outline parametrically.