To create a spline using control vertices, expand the Draw panel and click the Spline CV button. Note that when defining a spline using control vertices, there will be one more control vertex than the number of degrees, so a 3-degree spline has 4 control vertices. A 3-degree spline results in a cubic Bezier curve there can be two bends. A 2-degree spline results in a parabola there can be only one bend. A 1-degree spline results in a line there is no bend. For example, when creating splines using control vertices, you also set the degree or number of bends that can be created in each span of the spline. When you start the Spline command, there are several options. The Spline CV tool creates a spline using control vertices, in which case the points you select control the shape of the spline, but the spline does not necessarily pass through those points. The Spline Fit tool creates a spline using fit points, in which case the spline will pass through the points you select. Here you will find two tools for drawing splines. To create a spline, on the Home ribbon, expand the Draw panel. The spline on the right is drawn using control vertices. The spline on the left is drawn using fit points. A NURBS curve produces a smooth curve between control vertices or fit points. You can use the SPLINE command to create a type of curve known as a non-uniform rational B-spline or NURBS curve. Splines are a critical tool for creating curves that will subsequently be used for 3D modeling. While you can also create approximations of splines based on polylines, true spline objects are more accurate than splined polylines, they retain their definitions when edited, and they take up less space, resulting in smaller drawing files. Get quick and easy video tutorials on drawing splines and complex objects by AutoCAD experts.Ī spline is a smooth curve that either passes through or near a given set of points. Learn how to draw splines in AutoCAD 2018.
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