design function determines whether the point is inside a contour, outside, or lies on an edge (or coincides with a vertex). It returns positive (inside),negative (outside), or zero (on an edge) value, correspondingly. When measureDist=false , the return value is +1, -1, and 0, respectively. Otherwise, the return value is a signed distance between the point and the nearest contour edge.
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Chris Cleveland cokakola Dyuman Joshi Christian Schröder

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