knotvector_to_knots_and_mults

compas.geometry.knotvector_to_knots_and_mults(knotvector)

Convert a knot vector to a list of knots and multiplicities.

Parameters:

knotvectorlist[int | float]

Knot vector.

Returns:

tuple[list[int | float], list[int]]

Knots and multiplicities.

See also

construct_knotvector

knots_and_mults_to_knotvector

find_span

compute_basisfuncs

compute_basisfuncsderivs

Notes

The “standard” representation of a knot vector is a list of the form [0] * (degree + 1) + [i / d for i in range(1, d)] + [1] * (degree + 1), with d = pointcount - degree. This representation is used, for example, in the NURBS Book and OpenCASCADe.

Rhino uses a knot vector of the form [0] * (degree) + [i / d for i in range(1, d)] + [1] * (degree).