find_span

compas.geometry.find_span(n, degree, knotvector, u)

Find the knot span index for a given knot value.

Parameters:

nint

Number of control points minus 1.

degreeint

Degree of the curve.

knotvectorlist[int | float]

Knot vector of the curve.

ufloat

Parameter value.

Returns:

int

Knot span index.

Raises:

ValueError

If the parameter value is greater than the maximum knot or less than the minimum knot.

See also

construct_knotvector

knotvector_to_knots_and_mults

knots_and_mults_to_knotvector

compute_basisfuncs

compute_basisfuncsderivs

References

The NURBS Book. Chapter 2. Page 68. Algorithm A2.1.