NurbsCurve

class compas.geometry.NurbsCurve(*args, **kwargs)[source]

Bases: Curve

A NURBS curve is defined by control points, weights, knots, and a degree.

Parameters

name (str, optional) – The name of the curve.

Attributes

• points (list[Point], read-only) – The control points.

• weights (list[float], read-only) – The weights of the control points.

• knots (list[float], read-only) – The knots, without multiplicity.

• knotsequence (list[float], read-only) – The complete knot vector.

• multiplicity (list[int], read-only) – The multiplicities of the knots.

• continuity (int, read-only) – The degree of continuity of the curve.

• degree (int, read-only) – The degree of the curve.

• order (int, read-only) – The order of the curve (degree + 1).

Methods

copy	Make an independent copy of the current curve.
from_arc	Construct a NURBS curve from an arc.
from_circle	Construct a NURBS curve from a circle.
from_data	Construct a NURBS curve from its data representation.
from_ellipse	Construct a NURBS curve from an ellipse.
from_interpolation	Construct a NURBS curve by interpolating a set of points.
from_line	Construct a NURBS curve from a line.
from_parameters	Construct a NURBS curve from explicit curve parameters.
from_points	Construct a NURBS curve from control points.
from_step	Load a NURBS curve from an STP file.

Inherited Methods

ToString	Converts the instance to a string.
aabb	Compute the axis aligned bounding box of the curve.
closest_point	Compute the closest point on the curve to a given point.
curvature_at	Compute the curvature of the curve at a parameter.
divide_by_count	Divide the curve into a specific number of equal length segments.
divide_by_length	Divide the curve into segments of specified length.
fair
frame_at	Compute the local frame of the curve at a parameter.
from_json	Construct an object from serialized data contained in a JSON file.
from_jsonstring	Construct an object from serialized data contained in a JSON string.
from_obj	Load a curve from an OBJ file.
length	Compute the length of the curve.
locus	Compute the locus of points on the curve.
offset
point_at	Compute a point of the curve at a parameter.
reverse	Reverse the parametrisation of the curve.
reversed	Reverse a copy of the curve.
sha256	Compute a hash of the data for comparison during version control using the sha256 algorithm.
smooth
space	Compute evenly spaced parameters over the curve domain.
split
tangent_at	Compute the tangent vector of the curve at a parameter.
to_data	Convert an object to its native data representation.
to_json	Serialize the data representation of an object to a JSON file.
to_jsonstring	Serialize the data representation of an object to a JSON string.
to_obj	Write the curve geometry to an OBJ file.
to_step	Write the curve geometry to a STP file.
torsion_at	Compute the torsion of the curve at a parameter.
transform	Transform the geometry.
transformed	Returns a transformed copy of this geometry.
trim
validate_data	Validate the object's data against its data schema.
validate_json	Validate the object's data against its json schema.