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Creating True Splines

To create true spline curves in AutoCAD, you use the SPLINE command. Splines can be either 2D or 3D objects. You draw splines by specifying a series of fit-data points (vertices) through which the curve passes. The fit-data points determine the location of the spline’s control points. Control points contain the curve information for the spline. AutoCAD’s spline objects are true splines, unlike the spline approximations formed by spline-fit polylines. The SPLINE command draws non-uniform rational B-splines (NURBS). AutoCAD NURBS are mathematically more accurate than spline-fit polylines are. And even though spline objects are more accurate than spline-fit polylines, they actually require less memory for storage and result in smaller drawings, other factors being equal.

You can use the SPLINE command to convert 2D and 3D spline-fit polylines into true splines. Unlike spline-fit polylines, which can be either quadric or cubic spline approximations depending on how the SPLINETYPE system variable is set, the SPLINETYPE system variable does not affect the true spline objects produced by the SPLINE command.


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