/// <summary>
/// This code demonstrates how to process instances of Revit links.
/// </summary>
public RenderNodeAction OnLinkBegin(LinkNode node)
{
   // We can get more information about the family instance and its type if we need to
   ElementId symbolId = node.GetSymbolId();
   RevitLinkType linkType = m_document.GetElement(symbolId) as RevitLinkType;
   String linkDocumentName = linkType.Name;

   // Typically, an export context has to manage a stack of transformation
   // for all nested objects, such as instances, lights, links, etc.
   // A combined transformation needs to be applied to the incoming geometry
   // (providing all geometry is to be flattened in the resultant format.)
   m_TransformationStack.Push(m_TransformationStack.Peek().Multiply(node.GetTransform()));

   // We can either skip this link instance or proceed with rendering it
   return RenderNodeAction.Proceed;
}

/// <summary>
/// This method marks the end of processing a Revit link
/// </summary>
public void OnLinkEnd(LinkNode node)
{
   // Note: This method is invoked even for instances that were skipped.

   // If we maintain a transformation stack, we need to remove the latest one from it.
   m_TransformationStack.Pop();
}

' <summary>
' This code demonstrates how to process instances of Revit links.
' </summary>
Public Function OnLinkBegin(node As LinkNode) As RenderNodeAction Implements IExportContext.OnLinkBegin
    ' We can get more information about the family instance and its type if we need to
    Dim symbolId As ElementId = node.GetSymbolId()
    Dim linkType As RevitLinkType = TryCast(m_document.GetElement(symbolId), RevitLinkType)
    Dim linkDocumentName As [String] = linkType.Name

    ' Typically, an export context has to manage a stack of transformation
    ' for all nested objects, such as instances, lights, links, etc.
    ' A combined transformation needs to be applied to the incoming geometry
    ' (providing all geometry is to be flattened in the resultant format.)
    m_TransformationStack.Push(m_TransformationStack.Peek().Multiply(node.GetTransform()))

    ' We can either skip this link instance or proceed with rendering it
    Return RenderNodeAction.Proceed
End Function

' <summary>
' This method marks the end of processing a Revit link
' </summary>
Public Sub OnLinkEnd(node As LinkNode) Implements IExportContext.OnLinkEnd
    ' Note: This method is invoked even for instances that were skipped.


    ' If we maintain a transformation stack, we need to remove the latest one from it.
    m_TransformationStack.Pop()
End Sub