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Splines
CAD Toolbar:

Menu:
Draw - Spline
Command:
?
Options Toolbar:

Description:
Draws spline curves. Non-uniform rational B-Splines (NURBS) with
homogeneous weighting factors are the only ones that are currently
supported.
Procedure:
- Choose the degree of the spline in the options toolbar.
Supported degrees are 1, 2 (quadratic b-spline) and 3 (cubic b-spline).
The higher the degree, the 'smoother' the curve becomes. Degree 1
splines are almost never used.
Note, that a quadratic b-spline requires at least 3 control points
while a cubic b-spline needs at least 4 control points.
- Check the 'Closed' checkbox in the options toolbar if you want to
create a closed spline. Closed splines are continuous closed loops.
- Specify the control points. After defining the third
(for quadratic b-splines) or fourth (for cubic b-splines) control
point, a preview will be shown. You can remove the last
control point again if it was accidently put in the wrong place
by clicking the 'Undo' button in the options toolbar.
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Click the right mouse button to finish the spline tool.

Figure 32: Open
splines with four control points.

Figure 33: Closed
splines with the same control points.
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