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c3778fc96e
'Sketcher_Utils::MakeInterpolation' were changed to interpolate each spline section by the cubic B-spline passing through the control points that the tangent vector in each control point P is calculated by the following way: - if point P is preceded by a control point A and is followed by a control point B then the tangent vector is equal to (P - A) / |P - A| + (B - P) / |B - P|; - if point P is preceded by a control point A but is not followed by any control point then the tangent vector is equal to P - A; - if point P is followed by a control point B but is not preceded by any control point then the tangent vector is equal to B - P.