/// <summary>
/// This method marks the start of processing a view (a 3D view)
/// </summary>
public RenderNodeAction OnViewBegin(ViewNode node)
{
   // If we did not do so before we invoked the custom export
   // we can get information about the view from the supplied view node,
   // That includes : rendering settings, sun settings, camera data, etc.

   // Get the view information from the node.
   View3D theView = m_document.GetElement(node.ViewId) as View3D;
   string viewName = theView.Name;

   // Get the view's Orientation information.
   ViewOrientation3D theOrientation = theView.GetOrientation();

   // Get the view's camera information, such as whether is a perspective view.
   CameraInfo camera = node.GetCameraInfo();
   bool isPerspective = camera.IsPespective;

   // Get the view's render setting information, such as background style.
   RenderingSettings renderSettings = theView.GetRenderingSettings();
   BackgroundStyle bkStyle = renderSettings.BackgroundStyle;

   // Get the view's sun related information
   SunAndShadowSettings sun = theView.SunAndShadowSettings;

   // We can also determine whether we need to process instance of light objects (OnLight)
   bool needToExportLight =
      (renderSettings.LightingSource != LightingSource.ExteriorSun) &&
      (renderSettings.LightingSource != LightingSource.InteriorSun);

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

/// <summary>
/// This method marks the end of processing a view (a 3D view)
/// </summary>
public void OnViewEnd(ElementId elementId)
{
   // elementId it indicates which view has just been exported

   // Note: This method is invoked even for a view that was skipped.
}

' <summary>
' This method marks the start of processing a view (a 3D view)
' </summary>
Public Function OnViewBegin(node As ViewNode) As RenderNodeAction Implements IExportContext.OnViewBegin
    ' If we did not do so before we invoked the custom export
    ' we can get information about the view from the supplied view node,
    ' That includes : rendering settings, sun settings, camera data, etc.


    ' Get the view information from the node.
    Dim theView As View3D = TryCast(m_document.GetElement(node.ViewId), View3D)
    Dim viewName As String = theView.Name

    ' Get the view's Orientation information.
    Dim theOrientation As ViewOrientation3D = theView.GetOrientation()

    ' Get the view's camera information, such as whether is a perspective view.
    Dim camera As CameraInfo = node.GetCameraInfo()
    Dim isPerspective As Boolean = camera.IsPespective

    ' Get the view's render setting information, such as background style.
    Dim renderSettings As RenderingSettings = theView.GetRenderingSettings()
    Dim bkStyle As BackgroundStyle = renderSettings.BackgroundStyle

    ' Get the view's sun related information
    Dim sun As SunAndShadowSettings = theView.SunAndShadowSettings

    ' We can also determine whether we need to process instance of light objects (OnLight)
    Dim needToExportLight As Boolean = (renderSettings.LightingSource <> LightingSource.ExteriorSun) AndAlso (renderSettings.LightingSource <> LightingSource.InteriorSun)

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

' <summary>
' This method marks the end of processing a view (a 3D view)
' </summary>
Public Sub OnViewEnd(elementId As ElementId) Implements IExportContext.OnViewEnd
    ' elementId it indicates which view has just been exported


    ' Note: This method is invoked even for a view that was skipped.
End Sub