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Alibre Design

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Chapter 4 - Sketching4. Move the mouse pointer to shape the curve.5. Continue clicking to place additional control points.Note: You may choose to specify one or more control points by invoking the direct coordinateentry tool and keying in the X, Y coordinates.6. Double-click or hit escape to complete the spline curve.Note: By making the last control point to be the same as the first control point, a closed B-spline curve can be created.Creation of NURBS curves by interpolationUsing this method, you first specify a set of interpolation points in the Work Area that define the B-spline. A curve is then interpolated through the interpolation points.1. Select the B-spline by interpolation points tool fromthe Sketching toolbar; or from the Sketch menu select Figures > Spline > Create > B-splineby interpolation points.2. Click to start the spline curve.3. Move the mouse pointer and click a second time to place an interpolation point.4. Move the mouse pointer to shape the curve.5. Continue clicking to place additional interpolation points.Note: One or more interpolation points may be specified via the direct coordinate entry tool.6. Double-click or hit escape to complete the spline curve.Constraining B-spline curvesThe following constraints are supported on the new B-spline curve:58

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