Adding Controls to Splines
To add tangency control:
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In the Edit Sketch mode, select a spline.
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Click Add Tangency Control (Spline Tools toolbar) or Tools, Spline Tools, Add Tangency Control to display a new handle.
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Drag to place the handle.
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Click to position the handle.
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Use the handles to control tangency.
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Click OK .
To add curvature control:
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In the Edit Sketch mode, select a spline.
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Click Add Curvature Control (Spline Tools toolbar) or Tools, Spline Tools, Add Curvature Control to display a new curvature control pointer.
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Drag to position the handle.
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When you drag the curvature control pointer and it shifts sides, it indicates that you crossed an inflection point. To display inflection points, right-click and select Show Inflection Points .
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Click to position the handle.
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Select the ball of the curvature control pointer and drag in either direction along the vector handle to adjust the radius of curvature.
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Click OK .
To insert spline points:
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Select a spline.
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Click Insert Spline Point (Spline Tools toolbar) or Tools, Spline Tools, Insert Spline Point.
The pointer changes to .
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Click to position the spline point .
The spline point adds a spline handle.
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Insert additional spline points.
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Click OK .