compmec / pynurbs Goto Github PK

from compmec.nurbs import KnotVector
knotvector = (0.0, 0.0, 1.8678173101311735, 1.8678173101311735)
knotvector = KnotVector(knotvector)
knotvector.normalize()
print(knotvector)  # (0.0, 0.0, 0.9999999999999999, 0.9999999999999999)

It's expected to get the knotvector (0.0, 0.0, 1.0, 1.0)

Degree increase/reduction should accept parameter ```times = 0```, which does nothing

At the version v1.0.8, calling degree_increase or degree_decrease raises a ValueError when the parameter times = 0 is given.
It should do nothing in that case.

Steps to reproduce:

from compmec.nurbs import Curve

knotvector = (0, 0, 0, 1, 1, 1)  # degree 2, npts 3
curve = Curve(knotvector)
curve.degree_increase(0)  # Raises ValueError
curve.degree_decrease(0)  # Raises ValueError
curve.degree = 2  # Does nothing since degree is already 2

Knot insertion and removal with times != 1

The current functions to knot insertion and knot removal works only for a single point and only once per time.

Use ```abs``` to compute norm of a custom object, instead of ```getitem```

Spline/Rational curve accept float values

Currently, the code accepts only ControlPoints as a vector, but for a single value it should return a value

import numpy as np
U = KnotVector([0, 0, 0, 0.5, 1, 1, 1]) # p = 2, n = 4
N = SplineBaseFunction(U)
P = np.random.rand(4)
C = SplineCurve(N, P)
t = np.linspace(0, 1, 11)
print("C(t),shape =", C(t).shape)  # Should be (11,), not (11, 1)

compmec / pynurbs Goto Github PK

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pynurbs's Issues

Knot removal doesn't work for some degrees

Implement sum of two curves

Function ```normalize``` in ```KnotVector``` should consider float precision

Degree increase/reduction should accept parameter ```times = 0```, which does nothing

Steps to reproduce:

Knot insertion and removal with times != 1

Use ```abs``` to compute norm of a custom object, instead of ```getitem```

Spline/Rational curve accept float values

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