Adds a knot to a NURBS curve.
To apply: Select an isopoint on a curve, then choose from the Model menu.
To redisplay: Select the curve, click on the Select panel, then click the corresponding icon.
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Specifies the continuity of the knot. For a cubic NURBS curve:
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A multiplicity of corresponds to C2 continuity (curvature).
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A multiplicity of corresponds to C1 continuity (tangency).
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A multiplicity of corresponds to C0 continuity (position).
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Curve