## CollectionItem.SubComponent

### Description

Returns the SubComponent object if the CollectionItem is a subelement container. Otherwise it will return "nothing". For example, if geometry components are selected, then Selection.Item returns a CollectionItem containing those subelements (points, edges, facets, etc.). By converting the CollectionItem into a SubComponent, you can use the SubComponent.ComponentCollection property to work with the specific geometry interfaces (ControlPoint, Vertex, Edge, NurbsCurve, etc.).

### C# Syntax

    // get accessor
    SubComponent rtn = CollectionItem.SubComponent;

### Examples

#### 1. VBScript Example

    '
    '       This example demonstrates how to determine which edges are selected
    '       in the UI by using the SubComponent object via the Selection
    '
    NewScene , false
    ' Setup: create a polygon mesh and select some edges on it
    set disc = Application.ActiveSceneRoot.AddGeometry( "Disc", "MeshSurface" )
    Selection.Clear()
    Selection.SetAsText( disc.Name & ".edge[113,115,117,119,121]" )
    ' When components are selected, the first member of the Selection
    ' is returned as a CollectionItem which can then be converted to a
    ' SubComponent object. From there, the ComponentCollection property
    ' converts it to the proper collection type (in this case an EdgeCollection)
    set selected = Selection(0).SubComponent.ComponentCollection
    for each sel in selected
            Application.LogMessage "edge[" & sel.Index & "] is selected."
    next
    ' Expected results:
    'INFO : edge[113] is selected.
    'INFO : edge[115] is selected.
    'INFO : edge[117] is selected.
    'INFO : edge[119] is selected.
    'INFO : edge[121] is selected.

#### 2. VBScript Example

    set oRoot = Application.ActiveProject.ActiveScene.Root
    set oObject = oRoot.AddGeometry("Cube", "MeshSurface", "MyCube")
    set oItem = CreateObject("XSI.CollectionItem")
    oItem.Value = oObject.FullName & "." & siVertexCluster & "[*]"
    set oSubComponent = oItem.SubComponent

### See Also

Selection