If this piece of geometry is a component in something larger, like a BrepEdge in a Brep, then this function returns the component index.

Namespace: Rhino.Geometry
Assembly: RhinoCommon (in RhinoCommon.dll) Version: Rhino 6.0

C#

public ComponentIndex ComponentIndex()

VB

Public Function ComponentIndex As ComponentIndex

Type: ComponentIndex
This object's component index. If this object is not a sub-piece of a larger geometric entity, then the returned index has m_type = ComponentIndex.InvalidType and m_index = -1.

Supported in: 6.0.16224.21491, 5D58w

GeometryBase Class
Rhino.Geometry Namespace