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A spline is a smooth curve defined by a set of points. You can use splines to create
sculptured shapes such as the cross section of a turbine blade or an airplane wing.
Specifying fit tolerance
By default, a spline passes through all of the control points. When you draw a spline,
you can change this by specifying the fit tolerance. The fit tolerance value determines
how closely the spline fits the set of points you specify. For example, a spline fit tolerance
value of 0 causes the spline to pass through the control points. A value of 0.01
creates a spline that passes through the start and endpoints and within 0.01 units of
the intermediate control points.
Drawing a closed spline
You can draw a closed spline, which is a spline for which the start point and endpoint
are the same. Because the spline is closed, you specify only one tangent.
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