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NurbsSurfaceUVNDirectionsAt Method

Calculates the U, V, and N directions of a NURBS surface at a u,v parameter similar to the method used by Rhino's MoveUVN command.

Namespace:  Rhino.Geometry
Assembly:  RhinoCommon (in RhinoCommon.dll)
Since: 7.0
Syntax
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public bool UVNDirectionsAt(
	double u,
	double v,
	out Vector3d uDir,
	out Vector3d vDir,
	out Vector3d nDir
)

Parameters

u
Type: SystemDouble
The u evaluation parameter.
v
Type: SystemDouble
The v evaluation parameter.
uDir
Type: Rhino.GeometryVector3d
The U direction.
vDir
Type: Rhino.GeometryVector3d
The V direction.
nDir
Type: Rhino.GeometryVector3d
The N direction.

Return Value

Type: Boolean
true if successful, false otherwise.
See Also