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PolylineTangentAt Method
Gets the unit tangent vector along the polyline at the given parameter. The integer part of the parameter indicates the index of the segment.

Namespace: Rhino.Geometry
Assembly: RhinoCommon (in RhinoCommon.dll) Version: 5.1.50000.0 (5.0.20693.0)
Syntax
public Vector3d TangentAt(
	double t
)

Parameters

t
Type: SystemDouble
Polyline parameter.

Return Value

Type: Vector3d
The tangent along the polyline at t.
See Also