The tangent vector at the start of the curve.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.2.0.0 (26.2.0.0)
Syntax
C#
public XYZ StartTangent { get; set; }
Property Value
XYZThis must be a nomalized unit vector.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentNullException | When setting this property: A non-optional argument was null |
| ArgumentOutOfRangeException | When setting this property: startTangent is not length 1.0. |
| InapplicableDataException | The start tangent value is not set. |