OCCNurbsCurve

class compas_occ.geometry.OCCNurbsCurve(*args, **kwargs)[source]

Bases: compas_occ.geometry.curves.curve.OCCCurve, compas.geometry.curves.nurbs.NurbsCurve

Class representing a NURBS curve based on the BSplineCurve of the OCC geometry kernel.

Parameters

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

Attributes

points (list[Point], read-only) – The control points of the curve.
weights (list[float], read-only) – The weights of the control points of the curve.
knots (list[float], read-only) – The knots of the curve, without multiplicities.
knotsequence (list[float], read-only) – The full vector of knots of the curve.
multiplicities (list[int], read-only) – The multiplicities of the knots of the curve.
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).
is_rational (bool, read-only) – Flag indicating that the curve is rational.

Other Attributes

occ_shape (TopoDS_Shape, read-only) – The underlying OCC curve embedded in an edge and converted to a shape.
occ_edge (TopoDS_Edge, read-only) – The underlying OCC curve embedded in an edge.
occ_points (TColgp_Array1OfPnt, read-only) – The control points of the curve.
occ_weights (TColStd_Array1OfReal, read-only) – The weights of the control points of the curve.
occ_knots (TColStd_Array1OfReal, read-only) – The knots of the curve, without multiplicities.
occ_knotsequence (TColStd_Array1OfReal, read-only) – The full vector of knots of the curve.
occ_multiplicities (TColStd_Array1OfInteger, read-only) – The multiplicities of the knots of the curve.

Examples

Curve from points…

>>> from compas.geometry import Point
>>> from compas_occ.geometry import OCCNurbsCurve
>>> points = [Point(0, 0, 0), Point(3, 6, 0), Point(6, -3, 3), Point(10, 0, 0)]
>>> curve = OCCNurbsCurve.from_points(points)

Curve from parameters…

>>> from compas.geometry import Point
>>> from compas_occ.geometry import OCCNurbsCurve
>>> points = [Point(0, 0, 0), Point(3, 6, 0), Point(6, -3, 3), Point(10, 0, 0)]
>>> curve = OCCNurbsCurve.from_parameters(
...     points=points,
...     weights=[1.0, 1.0, 1.0, 1.0],
...     knots=[0.0, 1.0],
...     multiplicities=[4, 4],
...     degree=3)

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_edge`	Construct a NURBS curve from an existing OCC TopoDS_Edge.
`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.
`join`	Modifies this curve by joining it with another curve.
`joined`	Returns a new curve that is the result of joining this curve with another.
`segment`	Modifies this curve by segmenting it between the parameters u and v.
`segmented`	Returns a copy of this curve by segmenting it between the parameters u and v.

Inherited Methods

`ToString`	Converts the instance to a string.
`aabb`	Compute the axis aligned bounding box of the curve.
`closest_parameters_curve`	Computes the curve parameters where the curve is the closest to another given curve.
`closest_point`	Compute the closest point on the curve to a given point.
`closest_points_curve`	Computes the points on curves where the curve is the closest to another given curve.
`curvature_at`	Compute the curvature vector at a curve parameter.
`divide`	Divide the curve into a specific number of equal length segments.
`divide_by_count`	Divide the curve into a specific number of equal length segments.
`divide_by_length`
`embedded`	Return a copy of the curve embedded in the parameter space of the surface.
`fair`
`frame_at`	Compute the local frame at a curve parameter.
`from_data`	Construct a NURBS curve from its data representation.
`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.
`from_occ`	Construct a NURBS curve from an existing OCC BSplineCurve.
`from_step`	Load a NURBS curve from an STP file.
`length`	Compute the length of the curve.
`locus`	Compute the locus of points on the curve.
`offset`	Offset the curve over the specified distance in the given direction.
`point_at`	Compute the point at a curve parameter.
`projected`	Return a copy of the curve projected onto a surface.
`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 at a curve 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_polyline`	Convert the curve to a polyline.
`to_step`	Write the curve geometry to a STP file.
`torsion_at`	Compute the torsion of the curve at a parameter.
`transform`	Transform this curve.
`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.

OCCNurbsCurve

COMPAS