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Spline Command

Spline Command:

Command: SPL
SPLINE

Specify first point: This will specify the first point or start point of your spline.

Specify next point: This will specify the next point of your spline. and will keep creating lines untill you press enter.

Undo: Removes the last created segment.

Close: Closes the first segment of spline with the last segment. This creates a smooth curve along the loop.

Method: Controls whether the spline is created with fit points or control vertices.

Fit: This creates a degree 3 (Cubic) B-spline by specifying fit points that the spline must pass through. When the tolerance value is greater than 0, the spline must be within specifed tolerance distance from each point.

Control Vertices (CV)

Creates a spline by specifying control vertices. Use this method to create splines of degree 1 (linear), degree 2 (quadratic), degree 3 (cubic), and so on up to degree 10. Adjusting the shape of a spline by moving control vertices often provides better results than moving fit points.

Object

Converts 2D or 3D quadratic or cubic spline-fit polylines to equivalent splines. The original polyline is retained or discarded depending on the setting of the DELOBJ system variable.

Prompts for Splines with Fit Points

The following prompts are specific to the fit point method.

Knots

Specifies the knot parameterization, one of several computational methods that determines how the component curves between successive fit points within a spline are blended. (SPLKNOTS system variable)


  • Chord. ( Chord-Length method) Spaces the knots connecting each component curve to be proportional to the distances between each associated pair of fit points. An example is the green curve in the illustration.
  • Square root. (Centripetal method) Spaces the knots connecting each component curve to be proportional to the square root of the distance between each associated pair of fit points. This method usually produces “gentler” curves.
  • Uniform. (Equidistant method). Spaces the knots of each component curve to be equal, regardless of the spacing of the fit points. This method often produces curves that overshoot the fit points.
Start Tangency

Specifies a tangent condition on the starting point of the spline.

End Tangency

Specifies a tangent condition on the ending point of the spline.

Tolerance

Specifies the distance by which the spline is allowed to deviate from the specified fit points. A tolerance value of 0 requires the resulting spline to pass directly through the fit points. The tolerance value applies to all fit points except the starting and ending fit points, which always have a tolerance of 0.

Prompts for Splines with Control Vertices

The following prompt is specific to the control vertices (CV) method. 

Degree

Sets the polynomial degree of the resulting spline. Use this option to create splines of degree 1 (linear), degree 2 (quadratic), degree 3 (cubic), and so on up to degree 10.


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