The tangent vector at the start of the curve.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 21.0.0.0 (21.1.1.109)
Since:  2014

Syntax

C#
public XYZ StartTangent { get; set; }
Visual Basic
Public Property StartTangent As XYZ
	Get
	Set
Visual C++
public:
property XYZ^ StartTangent {
	XYZ^ get ();
	void set (XYZ^ value);
}

Field Value

This must be a nomalized unit vector.

Exceptions

ExceptionCondition
Autodesk.Revit.Exceptions..::..ArgumentNullException When setting this property: A non-optional argument was NULL
Autodesk.Revit.Exceptions..::..ArgumentOutOfRangeException When setting this property: startTangent is not length 1.0.
Autodesk.Revit.Exceptions..::..InapplicableDataException The start tangent value is not set.

See Also