4.18.7 NurbsCurve class

4.18.7 NurbsCurve class

class NurbsCurve: This class stores the data of a NURBS curve. NurbsCurve objects are returned when the value of a nurbsCurve attribute is requested.

The class has the following data members:

degree: The degree of the curve.

spans: The number of spans.

form

Form attribute. The attribute can have one of the following values:

Value	Meaning
`0`	Open
`1`	Closed
`2`	Periodic

isrational: This attribute is True if the curve contains a rational component. In this case, the control vertices have one additional value.

dimension: The dimension of the curve (2 or 3).

knots: This is a list of floats containing the knot values.

cvs: A list of control vertices. Each vertex is a tuple of 2, 3 or 4 floats (the actual number depends on the dimension and isrational settings).