Elements intersection with linked model's rooms

[Anonymous]

Hi there,

I am trying to get all elements that exist(intersects) in a Room that is defined in another(linked) Model.

So in the linked model, I have rooms, and I get their geometry with SpatialElementGeometryCalculator and try to intersect with all elements(FamilyInstance) using ElementIntersectsSolidFilter.

I am able to retrieve some elements that intersect with the roomSolid, but not all elements. For example, I can get duct fittings but not ducts. Can anybody help me if I'm missing out something? I tried to use Element instead of FamilyInstance, which returned nothing.

public List<FamilyInstance> getElementsInTheRoom(Room room)
{
List<FamilyInstance> elementsInTheRoom = new List<FamilyInstance>();
SpatialElementGeometryCalculator calculator = new SpatialElementGeometryCalculator(Global.doc());
SpatialElementGeometryResults results = calculator.CalculateSpatialElementGeometry(room); // compute the room geometry 
Solid roomSolid = results.GetGeometry(); // get the solid representing the room's geometry

elementsInTheRoom = new FilteredElementCollector(Global.doc()).                                            OfClass(typeof(FamilyInstance)).WherePasses(new ElementIntersectsSolidFilter(roomSolid)).Cast<FamilyInstance>().ToList();
}

[jeremytammik]

https://thebuildingcoder.typepad.com/blog/2020/05/using-referenceintersector-with-a-linked-file.html

[Anonymous]

Hello Jeremy, thanks for your response.

Actually I don't have an issue with getting the rooms from the linked model. I can turn those rooms into solids. I can even create generic objects with them. But when intersecting them with the FilteredElementCollector by ElementIntersectsSolidFilter  I only get some elements. Not all elements. Is this a bug?  It should be legal to intersect solid geometries with other elements right?

Why do you suggest using ReferenceIntersector? Also, Rooms don't have LocationCurve property so I couldn't make it work. How should I proceed? 🙄

foreach (Document arcDoc in linkedDocs)
{
if (arcDoc.Title.Contains("ARQ"))
{
FilteredElementCollector linkElementCollector = new FilteredElementCollector(arcDoc);
rooms = new FilteredElementCollector(arcDoc).
                        WhereElementIsNotElementType().
                        OfClass(typeof(SpatialElement)).
                        Where(e => e.GetType() == typeof(Room)).Cast<Room>().ToList();
                }
            }

[Anonymous · Accepted solution]

elementsInTheRoom = new FilteredElementCollector(Global.doc()).WherePasses(filter).ToList();

Turns out that there is no need to use "OfClass(typeof(FamilyInstance))" and "Cast<FamilyInstance>()"