I am trying to toggle the visibility of point clouds in a view by setting the 'View.ArePointCloudsHidden' property. I have come across three (3) scenarios, and they code below handles the first two correctly, but the third is not working and I am not sure why.
Scenario 1: View has no view template. Below code successfully toggles Point Cloud Visibility on/off.
Scenario 2: View has a view template that controls point cloud visibility. The below code first applies 'temporary view properties' to the view, and then toggles Point Cloud Visibility on/off. This code also works.
Scenario 3: View has a view template that DOES NOT controls point cloud visibility. The below code doesn't work, and the Point Cloud Visibility in the view stays the same.
public override Result Execute(UIApplication uiapp)
{
try
{
Document doc = uiapp.ActiveUIDocument.Document;
View activeView = uiapp.ActiveUIDocument.ActiveView;
using (Transaction formTx = new Transaction(doc))
{
try
{
// determine transaction name (shown to user in undo/redo stack)
string transactionName = activeView.ArePointCloudsHidden
? "Show Point Clouds"
: "Hide Point Clouds";
formTx.Start(transactionName);
// enable temporary view graphics for this view if:
// (1) point cloud visibiliity is controlled by the view's view template, and
// (2) temporary view graphics aren't on already
if (
DoesViewTemplateControlPointCloudVisibility(doc, activeView.ViewTemplateId) &&
!activeView.TemporaryViewModes.IsModeActive(TemporaryViewMode.TemporaryViewProperties)
)
{
// enable temporary view properties only if it's available in the active view
if (activeView.TemporaryViewModes.IsModeAvailable(TemporaryViewMode.TemporaryViewProperties))
{
activeView.EnableTemporaryViewPropertiesMode(activeView.Id);
}
else
{
formTx.RollBack();
return Result.Failed;
}
}
// toggle point cloud visibility
activeView.ArePointCloudsHidden = !activeView.ArePointCloudsHidden;
formTx.Commit();
}
catch (Exception e)
{
if (formTx.HasStarted())
{
formTx.RollBack();
}
return Result.Failed;
}
}
return Result.Succeeded;
}
catch (Exception e)
{
UIUtil.ShowRevitDialogExceptionError(e);
return Result.Failed;
}
}
/// <summary>
/// Returns true if the given view template has control over whether
/// point clouds are visible are not in a given view
/// </summary>
private bool DoesViewTemplateControlPointCloudVisibility(Document doc, ElementId viewTemplateId)
{
View viewTemplate = doc.GetElement(viewTemplateId) as View;
//? throw exception instead?
if (viewTemplate == null || !viewTemplate.IsTemplate) return false; // input validation
// get the parameters that are NOT controlled by this view template
IEnumerable<int> paramsNotControlledByViewTemplate =
viewTemplate.GetNonControlledTemplateParameterIds()
.Select(id => id.IntegerValue);
// return false if the list of parameters NOT controlled by the view template inclused the point cloud parameter
return paramsNotControlledByViewTemplate.Contains((int)BuiltInParameter.VIS_GRAPHICS_POINT_CLOUDS)
? false
: true;
//todo: check view template filters too
}
Is there, perhaps, a different way to set point cloud visibility when a view template is applied, even though the view template doesn't control Point Cloud Visibility, that I should be using?
