Element Get Generating Element Ids Method

Returns the ids of the element(s) that generated the input geometry object.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)

Syntax

public ICollection<ElementId> GetGeneratingElementIds(
	GeometryObject geometryObject
)

Public Function GetGeneratingElementIds ( 
	geometryObject As GeometryObject
) As ICollection(Of ElementId)

public:
ICollection<ElementId^>^ GetGeneratingElementIds(
	GeometryObject^ geometryObject
)

member GetGeneratingElementIds : 
        geometryObject : GeometryObject -> ICollection<ElementId>

Parameters

geometryObject GeometryObject: The geometry object whose generating element is requested.

Return Value

ICollection ElementId
The id(s) of the element(s) that generated (or may have generated) the given geometry object. Empty if no generating elements are found. If the set contains just one id, it is the id of the element that generated the geometry object.

Exceptions

Exception	Condition
ArgumentException	The input geometryObject is invalid and so cannot be used to obtain the generating element ids.
ArgumentNullException	A non-optional argument was null

Remarks

This function supports many different types of relationships among elements. Most of these relationships will return a single element, for example:

Window and door cutting walls
Openings cutting hosts
Face splitting faces
Wall sweep or reveal traversing wall

A few relationships have the potential for returning multiple elements, including:

Walls joining to other wall(s)
Elements extending to roof(s)

If more than one id is returned, one of them (unspecified) is the id of the element that generated the geometry object and the others are ids of related elements. For example, if a wall A is joined to two walls B and C in a way that creates two end faces, and if this function is called for one of the two end faces, it will return the ids of walls B and C.

Example

C++

// Find elements joined or attached to the end faces of a given wall (such as walls and roofs).
// Mid-joined walls (such as in a T configuration) are not found because they do not affect end face geometry.

ICollection<ElementId> joinedElements = new Collection<ElementId>(); // collection to store the walls joined to the selected wall

// find all faces of the selected wall
GeometryElement geometryElement = wall.get_Geometry(new Options());
foreach (GeometryObject geometryObject in geometryElement)
{
    if (geometryObject is Solid)
    {
        Solid solid = geometryObject as Solid;
        foreach (Face face in solid.Faces)
        {
            // for each face, find the other elements that generated the geometry of that face
            ICollection<ElementId> generatingElementIds = wall.GetGeneratingElementIds(face);

            generatingElementIds.Remove(wall.Id); // remove the originally selected wall, leaving only other elements joined to it
            foreach (ElementId id in generatingElementIds)
            {
                if (!(joinedElements.Contains(id)))
                    joinedElements.Add(id); // add each wall joined to this face to the overall collection 
            }
        }
    }
}

uidocument.Selection.SetElementIds(joinedElements); // select all of the joined elements

' Find elements joined or attached to the end faces of a given wall (such as walls and roofs).
' Mid-joined walls (such as in a T configuration) are not found because they do not affect end face geometry.

Dim joinedElements As ICollection(Of ElementId) = New Collection(Of ElementId)()
' collection to store the walls joined to the selected wall
' find all faces of the selected wall
Dim geometryElement As GeometryElement = wall.Geometry(New Options())
For Each geometryObject As GeometryObject In geometryElement
    If TypeOf geometryObject Is Solid Then
        Dim solid As Solid = TryCast(geometryObject, Solid)
        For Each face As Face In solid.Faces
            ' for each face, find the other elements that generated the geometry of that face
            Dim generatingElementIds As ICollection(Of ElementId) = wall.GetGeneratingElementIds(face)

            generatingElementIds.Remove(wall.Id)
            ' remove the originally selected wall, leaving only other elements joined to it
            For Each id As ElementId In generatingElementIds
                If Not (joinedElements.Contains(id)) Then
                    joinedElements.Add(id)
                    ' add each wall joined to this face to the overall collection 
                End If
            Next
        Next
    End If
Next

uidocument.Selection.SetElementIds(joinedElements)
' select all of the joined elements

Reference

Element Class

Autodesk.Revit.DB Namespace

GetGeneratingElementIds Method

Element Get Generating Element Ids Method

Parameters

Return Value

Reference