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CurveTangentAtStart Property
Evaluates the unit tangent vector at the start of the curve.

Namespace: Rhino.Geometry
Assembly: RhinoCommon (in RhinoCommon.dll) Version: 5.1.50000.0 (5.0.20693.0)
Syntax
public Vector3d TangentAtStart { get; }

Return Value

Type: Vector3d
Unit tangent vector of the curve at the start point.
Remarks
No error handling.
See Also