OCCNurbsCurve

class compas_occ.geometry.OCCNurbsCurve(*args, **kwargs)

Bases: OCCCurve, NurbsCurve

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

Parameters:

namestr, optional

The name of the curve.

Attributes:

continuityint, read-only

The degree of continuity of the curve.

degreeint, read-only

The degree of the curve.

is_rationalbool, read-only

Flag indicating that the curve is rational.

knotslist[float], read-only

The knots of the curve, without multiplicities.

knotsequencelist[float], read-only

The full vector of knots of the curve.

multiplicitieslist[int], read-only

The multiplicities of the knots of the curve.

orderint, read-only

The order of the curve (= degree + 1).

pointslist[Point], read-only

The control points of the curve.

weightslist[float], read-only

The weights of the control points 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_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_native	Construct a NURBS curve from an existing OCC BSplineCurve.
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.
compute_aabb	Compute the axis-aligned bounding box of the geometry.
compute_obb	Compute the oriented bounding box of the geometry.
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	Divide the curve into segments of a given length.
elevate_degree
embedded	Return a new curve embedded in the parameter space of the surface.
fair
frame_at	Compute the local frame at a curve parameter.
from_json	Construct an object of this type from a JSON file.
from_jsonstring	Construct an object of this type from a JSON string.
from_obj	Load a curve from an OBJ file.
from_occ	Construct a curve from an existing OCC BSplineCurve.
from_step	Load a NURBS curve from an STP file.
insert_knot
length	Compute the length of the curve.
normal_at	Compute the normal of the curve at a parameter.
offset	Return a new curve that is the offset of this curve over the specified distance in the given direction.
parameter_at_distance	Compute the parameter of a point on the curve at a given distance along the curve from a point at a given parameter.
point_at	Compute the point at a curve parameter.
projected	Return a copy of the curve projected onto a surface.
reduce_degree
refine_knot
remove_knot
reverse	Reverse the parametrisation of the curve.
reversed	Reverse a copy of the curve.
rotate	Rotate the geometry.
rotated	Returns a rotated copy of this geometry.
scale	Scale the geometry.
scaled	Returns a scaled copy of this geometry.
sha256	Compute a hash of the data for comparison during version control using the sha256 algorithm.
smooth
split
tangent_at	Compute the tangent vector at a curve parameter.
to_json	Convert an object to its native data representation and save it to a JSON file.
to_jsonstring	Convert an object to its native data representation and save it to a JSON string.
to_obj	Write the curve geometry to an OBJ file.
to_points	Convert the curve to a list of points.
to_polygon	Convert the curve to a polygon.
to_polyline	Convert the curve to a polyline.
to_step	Write the curve geometry to a STP file.
transform	Transform this curve.
transformed	Returns a transformed copy of this geometry.
translate	Translate the geometry.
translated	Returns a translated copy of this geometry.
trim
validate_data	Validate the data against the object's data schema.