NurbsCurve¶

class NurbsCurve¶

Bases: rumba.Points

A nurbs curve value.

This object is a standard nurbs curve with no other parameter than a position.

Constructors

__init__

Methods

`closest`(p)	Compute the curve closest point to p.
`degree`()	Return the curve degree.
`evaluate`(u)	Evaluate the curve at a u coordinate.
`evaluate_dp`(u)	Evaluate the curve position derivatives at a u coordinate.
`length`(start)	Compute the curve length between the start and end u parameters.
`mode`()	Return the curve degree.
`range`()	Return the curve parameter visible range.
`read_knots`()	Return the readable curve knots.
`read_weights`()	Return the readable control points weights.
`resample`(knots,degree)	Resample a curve.
`reverse`()	Reverse the control point order.
`span`()	Return the number of span.
`write_knots`()	Return the writable curve knots.
`write_weights`()	Return the writable control points weights.

class Mode¶

Bases: pybind11_builtins.pybind11_object

Members:

Periodic

Open

Closed

closest(p: Imath.V3f, r: Imath.V3f, error: float, max_try: int) → float¶

Compute the curve closest point to p.

Returns the curve parameter value of the closest point.

Parameters:	p (Imath.V3f) – The position to project on the curve r (Imath.V3f) – If not null, it is filled with the closest curve position error (float) – The minimum error in vertex space max_try (int) – Maximum numbr of try
Return type:	float

degree() → int¶

Return the curve degree.

Return type:	int

evaluate(u: float) → Imath.V3f¶

Evaluate the curve at a u coordinate.

Return type:	Imath.V3f

evaluate_dp(u: float) → Imath.V3f¶

Evaluate the curve position derivatives at a u coordinate.

Return the dp/du vector which may not be normalized.

Return type:	Imath.V3f

length(start: float, end: float, error: float) → float¶

Compute the curve length between the start and end u parameters.

Parameters:	start (float) – The starting u parameter of the arc end (float) – The ending u parameter of the arc error (float) – The relative accepted error of the result
Return type:	float

mode() → Mode¶

Return the curve degree.

Return type:	Mode

range() → Imath.V2f¶

Return the curve parameter visible range.

For periodic curves, this is not the same than the first and last knots.

Return type:	Imath.V2f

read_knots() → BufferConstFloat¶

Return the readable curve knots.

Return type:	BufferConstFloat

read_weights() → BufferConstFloat¶

Return the readable control points weights.

Return type:	BufferConstFloat

resample(knots, degree: int) → None¶

Resample a curve.

Modify the curve knots and degree and rebuild the curve in order to keep its shape if possible.

reverse() → None¶: Reverse the control point order.

span() → int¶

Return the number of span.

Return type:	int

write_knots() → BufferFloat¶

Return the writable curve knots.

Return type:	BufferFloat

write_weights() → BufferFloat¶

Return the writable control points weights.

Return type:	BufferFloat