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Geom::Line prev_parallel_hull_edge;
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prev_parallel_hull_edge.setOrigin(hull_edge.origin()+hull_edge.versor().ccw()*spacing);
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prev_parallel_hull_edge.setVersor(hull_edge.versor());
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for (int i = 0; i < hull_size; ++i)
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hull_edge.setPoints(hull[i], hull[i+1]);