This object is returned by a call to hou.Geometry.importLop. This object must remain in scope as long as the hou.Geometry object contains packed primitives representing USD primitives created from the LOP node. Once this object leaves scope, it may become impossible to view or unpack the USD packed primitives in the hou.Geometry object.
Returns the identifier for the root layer of the stage held by this object. This will always be an anonymous layer identifier.