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NewFamilyInstance Method (Reference, XYZ, XYZ, FamilySymbol)

Inserts a new instance of a family onto a face referenced by the input Reference instance, using a location, reference direction, and a type/symbol.

Namespace: Autodesk.Revit.Creation
Assembly: RevitAPI (in RevitAPI.dll) Version: 17.0.0.0 (17.0.1090.0)

Syntax

C# 
public FamilyInstance NewFamilyInstance(
	Reference reference,
	XYZ location,
	XYZ referenceDirection,
	FamilySymbol symbol
)
Visual Basic 
Public Function NewFamilyInstance ( _
	reference As Reference, _
	location As XYZ, _
	referenceDirection As XYZ, _
	symbol As FamilySymbol _
) As FamilyInstance
Visual C++ 
public:
FamilyInstance^ NewFamilyInstance(
	Reference^ reference, 
	XYZ^ location, 
	XYZ^ referenceDirection, 
	FamilySymbol^ symbol
)

Parameters

reference
Type: Autodesk.Revit.DB Reference
A reference to a face.
location
Type: Autodesk.Revit.DB XYZ
Point on the face where the instance is to be placed.
referenceDirection
Type: Autodesk.Revit.DB XYZ
A vector that defines the direction of the family instance. Note that this direction defines the rotation of the instance on the face, and thus cannot be parallel to the face normal.
symbol
Type: Autodesk.Revit.DB FamilySymbol
A FamilySymbol object that represents the type of the instance that is to be inserted. Note that this symbol must represent a family whose FamilyPlacementType is WorkPlaneBased.

Return Value

An instance of the new object if creation was successful, otherwise a null reference ( Nothing in Visual Basic) .

Remarks

Use this method to insert one family instance on a face of another element, using a point on the face and a vector to define the position and direction of the new symbol.

The type/symbol that is used must be loaded into the document before this method is called. Families and their symbols can be loaded using the Document.LoadFamily or Document.LoadFamilySymbol methods.

The host object must support insertion of instances, otherwise this method will fail. If the instances fails to be created an exception may be thrown.

Some Families, such as Beams, have more than one endpoint and are inserted in the same manner as single point instances. Once inserted, these linear family instances can have their endpoints changed by using the instance's Element.Location property.

Note: if the created family instance includes nested instances, the API framework will automatically regenerate the document during this method call.

Examples

Copy C# 
void CreateNurseCallDomeOnWall(Autodesk.Revit.DB.Document document, Wall wall)
{
    FilteredElementCollector collector = new FilteredElementCollector(document);
    collector.OfClass(typeof(FamilySymbol)).OfCategory(BuiltInCategory.OST_NurseCallDevices);

    FamilySymbol symbol = collector.FirstElement() as FamilySymbol;

    // Get interior face of wall
    IList<Reference> sideFaces = HostObjectUtils.GetSideFaces(wall, ShellLayerType.Interior);
    Reference interiorFaceRef = sideFaces[0];

    XYZ location = new XYZ(4, 2, 8);
    XYZ refDir = new XYZ(0, 0, 1);

    FamilyInstance instance = document.Create.NewFamilyInstance(interiorFaceRef, location, refDir, symbol);
}
Copy VB.NET 
Private Sub CreateNurseCallDomeOnWall(document As Autodesk.Revit.DB.Document, wall As Wall)
    Dim collector As New FilteredElementCollector(document)
    collector.OfClass(GetType(FamilySymbol)).OfCategory(BuiltInCategory.OST_NurseCallDevices)

    Dim symbol As FamilySymbol = TryCast(collector.FirstElement(), FamilySymbol)

    ' Get interior face of wall
    Dim sideFaces As IList(Of Reference) = HostObjectUtils.GetSideFaces(wall, ShellLayerType.Interior)
    Dim interiorFaceRef As Reference = sideFaces(0)

    Dim location As New XYZ(4, 2, 8)
    Dim refDir As New XYZ(0, 0, 1)

    Dim instance As FamilyInstance = document.Create.NewFamilyInstance(interiorFaceRef, location, refDir, symbol)
End Sub

Exceptions

Exception Condition
Autodesk.Revit.Exceptions ArgumentNullException Thrown when a non-optional argument was null.
Autodesk.Revit.Exceptions ArgumentException Thrown when the function cannot get the face from the reference, or, when the Family cannot be placed as line-based on an input face reference, because its FamilyPlacementType is not WorkPlaneBased
Autodesk.Revit.Exceptions ArgumentsInconsistentException Thrown when reference direction is parallel to face normal at insertion point.
Autodesk.Revit.Exceptions InvalidOperationException Thrown when Revit is unable to place the family instance.
Autodesk.Revit.Exceptions ArgumentException Thrown if The symbol is not active.

See Also