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HermiteSurfaceUTangentAt Method

Get the "u" tangent direction (actually first derivative) to interpolate at the u,v parameter location.

Namespace:  Rhino.Geometry
Assembly:  RhinoCommon (in RhinoCommon.dll)
Since: 7.0
Syntax
Copy
public Vector3d UTangentAt(
	int uIndex,
	int vIndex
)

Parameters

uIndex
Type: SystemInt32
The "u" index.
vIndex
Type: SystemInt32
The "v" index.

Return Value

Type: Vector3d
The tangent direction.
See Also