# NurbsSurfaceKnotList class

Namespace: [Rhino.Geometry.Collections](https://developer.rhino3d.com/api/rhinocommon/namespace/rhino.geometry.collections.md) · Assembly: [RhinoCommon](https://developer.rhino3d.com/api/rhinocommon/assembly/rhinocommon.md)

```cs
public sealed class NurbsSurfaceKnotList : IEnumerable<double>, IEpsilonComparable<NurbsSurfaceKnotList>
```

Provides access to the knot vector of a NURBS surface.

## Properties

- [ClampedAtEnd](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/clampedatend.md): Determines if a knot vector is clamped.
- [ClampedAtStart](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/clampedatstart.md): Determines if a knot vector is clamped.
- [Count](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/count.md): Gets the total number of knots in this curve.
- [KnotStyle](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/knotstyle.md): Gets the style of the knot vector.

## Indexers

- [this[]](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/item.md): Gets or sets the knot vector value at the given index.

## Methods

- [CreatePeriodicKnots](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/createperiodicknots.md): Compute a clamped, uniform, periodic knot vector based on the current degree and control point count. Does not change values of control vertices.
- [CreateUniformKnots](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/createuniformknots.md): Compute a clamped, uniform knot vector based on the current degree and control point count. Does not change values of control vertices.
- [EnsurePrivateCopy](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/ensureprivatecopy.md): If you want to keep a copy of this class around by holding onto it in a variable after a command completes, call EnsurePrivateCopy to make sure that this class is not tied to the document. You can call this function as many times as you want.
- [EpsilonEquals](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/epsilonequals.md): Check that all values in other are within epsilon of the values in this
- [InsertKnot](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/insertknot.md): (2 overloads) Inserts a knot and update control point locations. Does not change parameterization or locus of curve.
- [KnotMultiplicity](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/knotmultiplicity.md): Get knot multiplicity.
- [RemoveKnots](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/removeknots.md): Remove knots from the knot vector and adjusts the remaining control points to maintain surface position as closely as possible. The knots from Knots[index0] through Knots[index1 - 1] will be removed.
- [RemoveKnotsAt](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/removeknotsat.md): Remove knots from the surface and adjusts the remaining control points to maintain surface position as closely as possible.
- [RemoveMultipleKnots](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/removemultipleknots.md): Remove multiple knots from this surface
- [SuperfluousKnot](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/superfluousknot.md): Computes the knots that are superfluous because they are not used in NURBs evaluation. These make it appear so that the first and last surface spans are different from interior spans. http://wiki.mcneel.com/developer/onsuperfluousknot
- [IEnumerable<double>.GetEnumerator](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/system-collections-generic-ienumerable-system-double-getenumerator.md)
- [IEnumerable.GetEnumerator](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.collections.nurbssurfaceknotlist/system-collections-ienumerable-getenumerator.md)