As discussed in our article Drawing SPLINE in AutoCAD (Best Practices!) SPLINE is a smooth curve that passes through or near points we choose on the screen. They are blended cubic curve segments called non-uniform rational B-splines (NURBS).
In this post, we are taking a look at how to Edit SPLINE objects this includes how to add or remove vertexes from splines, how to elevate curve order, change the weight (adding more vertexes for better accuracy), etc.
Editing Splines can be done by the Multifunctional Grips, SPLINEDIT, and the Properties palette.
Multifunctional Grips are grips that you see when selecting a Spline. They can generally appear in two ways, small circles (Control Vertexes) or small rectangles (Fit points).
To quote our earlier article Drawing SPLINE in AutoCAD (Best Practices!)
The Fit points method creates blended Cubic curves (degree 3) by specifying fit points that curvature must pass through or if the tolerance value is greater than 0, the spline within the specified tolerance from each specified point.
The Control Vertices method creates linear (degree 1), quadratic (degree 2), cubic (degree 3), and up to degree 10 splines. (SPLMETHOD system variable)
To quickly switch between the two modes, select the SPLINE and at the beginning of the object you will see a triangle pointing down.
Click on it and from the drop-down menu, select the mode you need.
To quickly edit the number of vertexes or fit points of a SPLINE, when selected, hoover over a grip point and AutoCAD will present you with the options to:
Pro Tip: When you select either a Fit Point or a Vertex, you can easily toggle between Stretch, Add and Remove options on the go by clicking the CTRL key on the keyboard.
Editing SPLINES using the SPLINEDIT command or by right click and selecting Spline Edit gives us even more options than using the Multifunctional grips. Here are some of the more interesting ones.
The Properties panel of a Spline object in AutoCAD is pretty standard, there you can easily change the general object properties like Color, Layer, Linetype, Linetype Scale, etc.
Under data points, you can quickly check the number of control points, coordinates of a specific control point, and the current weight.
Note: When the Fit points method is triggered, under Data points you can change the knot parametrization too.
Additionally, you can change the SPLINE drawing method from the properties menu and Close or open the Spline.
I hope you find this post of value, you can check out our post on 3 Ways to Convert Spline to Polyline (How to Choose the Best!) next!
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