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This thread asks how to get the closest point on a Bezier curve given an arbitrary point on the same plane: Closest point on a cubic Bezier curve?

How can I accomplish the same thing but for a B-SPline curve?

Gary Allen
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    Apply the point-to-Bezier-curve algorithm to the Bezier curve converted from each segment of the B-spline curve then find out the global minimum. – fang Jan 14 '21 at 22:45

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