IFC File Model Understanding -BHTech Dec2017 Internal Workshop of the BIM Software & 3D Modelling Team BHTech – December 2017

1. Present a IFC model
on a Webpage
Internal Workshop of the BIM Software & 3D Modelling Team
BHTech – December 2017

2. Content
• What is IFC?
• IFC Data Model
• How to acquire all information of components (floors,
walls, doors, windows, etc) from an IFC file?

4. What is IFC
• Industry Foundation Classes that provide Information
For Constructions
• IFC2x3:
http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/
• IFC4x1:
http://www.buildingsmart-tech.org/ifc/IFC4x1/final/html/

5. Content of one IFC file
#94= IFCAXIS2PLACEMENT3D(#6,$,$);
#95= IFCDIRECTION((6.12303176911189E-17,1.));
#97= IFCGEOMETRICREPRESENTATIONCONTEXT($,'Model',3,0.01,#94,#95);
#100= IFCGEOMETRICREPRESENTATIONSUBCONTEXT('Axis','Model',*,*,*,*,#97,$,.GRAPH_VIEW.,$);
#102= IFCGEOMETRICREPRESENTATIONSUBCONTEXT('Body','Model',*,*,*,*,#97,$,.MODEL_VIEW.,$);
#103= IFCGEOMETRICREPRESENTATIONSUBCONTEXT('Box','Model',*,*,*,*,#97,$,.MODEL_VIEW.,$);
#104= IFCGEOMETRICREPRESENTATIONSUBCONTEXT('FootPrint','Model',*,*,*,*,#97,$,.MODEL_VIEW.,$);
#105= IFCPROJECT('1jKNVHFi905QRLwH307ivT',#41,’Project Number',$,$,’Project Number’,’Project
Description',(#97),#92);
#111= IFCPOSTALADDRESS($,$,$,$,(‘Flr.6 Technosoft Bld. Duy Tan Str.'),$,'','',‘’,’Vietnam');
#115= IFCBUILDING('1jKNVHFi905QRLwH307ivS',#41,'',$,$,#32,$,'',.ELEMENT.,$,$,#111);
#121= IFCAXIS2PLACEMENT3D(#6,$,$);
#122= IFCLOCALPLACEMENT(#32,#121);
#124= IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',#41,'9FL',$,$,#122,$,'9FL',.ELEMENT.,0.);
#126= IFCCARTESIANPOINT((0.,0.,4000.));
#128= IFCAXIS2PLACEMENT3D(#126,$,$);
#129= IFCLOCALPLACEMENT(#32,#128);
#130= IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uiC2',#41,'10FL',$,$,#129,$,'10FL',.ELEMENT.,4000.);
#132= IFCCARTESIANPOINT((0.,0.,8000.));
#134= IFCAXIS2PLACEMENT3D(#132,$,$);
#135= IFCLOCALPLACEMENT(#32,#134);

6. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);

7. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);
IfcId

8. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);
IfcEntity

9. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);
IfcRoot.GlobalId: IfcLabel

10. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);
IfcId of IfcOwnerHistory Entity

11. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);
IfcId of IfcOwnerHistory Entity
#41= IFCOWNERHISTORY(#38,#5,$,.NOCHANGE.,$,$,$,1510725918);
#38= IFCPERSONANDORGANIZATION(#35,#37,$);
#37= IFCORGANIZATION($,'','',$,$);
#35= IFCPERSON($,'','anh_tvv',$,$,$,$,$);
#5= IFCAPPLICATION(#1,'2018','Autodesk Revit 2018 (ENG)','Revit’);
#1= IFCORGANIZATION($,'Autodesk Revit 2018 (ENG)',$,$,$);

12. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);

13. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);
Entity’s name: IfcLabel

14. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);
Description

15. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);
Object Type

16. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);
Object Placement

17. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);
Representation

18. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);
Long name of
SpatialStructureElement

19. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);
Entity’s name: IfcLabel Long name of
SpatialStructureElement

20. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);
Composition Type: Element
Composition Enum

21. Example.ifc
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',
#41,'9FL',$,$,#122,$,'9FL’, .ELEMENT.,0.);
Elevation: IfcLengthMeasure

22. Example.ifc (IFC2x3)
• Component: The 9th floor
• Type: IfcBuildingStorey
• Properties:
• GlobalId: IfcGloballyUniqueId
• OwnerHistory: IfcOwnerHistory
• Name: IfcLabel
• Description: IfcText
• ObjectType: IfcLabel
• ObjectPlacement: IfcObjectPlacement
• Representation: IfcProductRepresentation
• LongName: IfcLabel
• CompositionType: IfcElementCompositionEnum
• Elevation: IfcLengthMeasure
IfcRoot
IfcObject
IfcProduct
IfcSpatialStructureElement
IfcBuildingStorey
#124=
IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',#41,'9FL',$,$,#122,$,'9FL’,
.ELEMENT.,0.);

23. Example.ifc (IFC2x3)
• Component: Building
• Type: IfcBuilding
• Properties:
• IfcRoot: (GlobalId, OwnerHistory, Name, Description)
• ObjectType: IfcLabel
• IfcProduct (ObjectPlacement, Representation)
• IfcSpatialStructureElement (LongName, CompositionType)
• ElevationOfRefHeight: IfcLengthMeasure
• ElevationOfTerrain: IfcLengthMeasure
• BuildingAddress: IfcPostalAddress
IfcBuilding
#115=
IFCBUILDING('1jKNVHFi905QRLwH307ivS',#41,'',$,$,#32,$,'',.ELEMENT.,$,$,#111);

24. Example.IFC (IFC2x3)
• Component: Wall
• Type: IfcWall
• Properties:
• IfcRoot (GlobalId, OwnerHistory, Name, Description)
• IfcObject (ObjectType)
• IfcProduct (ObjectPlacement, Reprsentation)
• IfcElement (Tag: IfcIdentifier)
#3115= IFCWALL('3geKXEO4D0pO9vrIZ3l37L’, #41, ‘Wall:125:318719:125:318719 :
Wall:125:318719:136012’, $, ‘Wall:125:318719: Wall:125:318719:136010’,
#3093, #3113, '136012');

25. IFC Data Model
class IfcBuilding {
IfcBuilding(globalId, ownerHistoryId, name, description, objectTypeId, objectPlacementId, representationId, longName, compositionType,
elevationOfRefHeight, elevationOfTerrain, buildingAddressId) {
// IfcRoot entity
this.globalId = globalId;
this.ownerHistory.id = ownerHistoryId;
this.name = name;
this.description = description;
// IfcObjectType entity
this.object = {};
this.object.objectType.id = objectTypeId;
// IfcProduct entity
this.product = {};
this.product.objectPlacement.id = objectPlacementId;
this.product.representation.id = representationId;
// IfcSpatialStructureElement entity
this.spatialStructureElement = {};
this.spatialStructureElement.longName = longName;
this.spatialStructureElement.compositionType = compositionType;
// These 3 entities belong to IfcBuilding themselves
// IfcLengthMeasure
this.elevationOfRefHeight = elevationOfRefHeight;
this.elevationOfTerrain = elevationOfTerrain;
// IfcPostalAddress
this.buildingAddress.id = buildingAddressId;
}
}

26. How one IFC file looks like
ISO-10303-21;
HEADER;
FILE_DESCRIPTION(('ViewDefinition [CoordinationView_V2.0]'),'2;1');
FILE_NAME(‘EXAMPLE','2017-11-27T10:11:23',(''),(''),'The EXPRESS Data
Manager Version 5.02.0100.07 : 28 Aug 2013','20170223_1515(x64) - Exporter
18.0.0.420 - Alternate UI 18.0.0.420','');
FILE_SCHEMA(('IFC2X3'));
ENDSEC;
Header

27. How one IFC file looks like
#94= IFCAXIS2PLACEMENT3D(#6,$,$);
#95= IFCDIRECTION((6.12303176911189E-17,1.));
#97= IFCGEOMETRICREPRESENTATIONCONTEXT($,'Model',3,0.01,#94,#95);
#100= IFCGEOMETRICREPRESENTATIONSUBCONTEXT('Axis','Model',*,*,*,*,#97,$,.GRAPH_VIEW.,$);
#102= IFCGEOMETRICREPRESENTATIONSUBCONTEXT('Body','Model',*,*,*,*,#97,$,.MODEL_VIEW.,$);
#103= IFCGEOMETRICREPRESENTATIONSUBCONTEXT('Box','Model',*,*,*,*,#97,$,.MODEL_VIEW.,$);
#104= IFCGEOMETRICREPRESENTATIONSUBCONTEXT('FootPrint','Model',*,*,*,*,#97,$,.MODEL_VIEW.,$);
#105= IFCPROJECT('1jKNVHFi905QRLwH307ivT',#41,’Project Number',$,$,’Project Number’,’Project
Desciption',(#97),#92);
#111= IFCPOSTALADDRESS($,$,$,$,(‘Flr.6 Technosoft Bld. Duy Tan Str.'),$,'','',‘’,’Vietnam');
#115= IFCBUILDING('1jKNVHFi905QRLwH307ivS',#41,'',$,$,#32,$,'',.ELEMENT.,$,$,#111);
#121= IFCAXIS2PLACEMENT3D(#6,$,$);
#122= IFCLOCALPLACEMENT(#32,#121);
#124= IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uJ2Q',#41,'9FL',$,$,#122,$,'9FL',.ELEMENT.,0.);
#126= IFCCARTESIANPOINT((0.,0.,4000.));
#128= IFCAXIS2PLACEMENT3D(#126,$,$);
#129= IFCLOCALPLACEMENT(#32,#128);
#130= IFCBUILDINGSTOREY('1jKNVHFi905QRLwH0$uiC2',#41,'10FL',$,$,#129,$,'10FL',.ELEMENT.,4000.);
#132= IFCCARTESIANPOINT((0.,0.,8000.));
#134= IFCAXIS2PLACEMENT3D(#132,$,$);
#135= IFCLOCALPLACEMENT(#32,#134);
Data…

28. How one IFC file looks like
#51355= IFCCARTESIANPOINT((-1124.,-533.499999999997));
#51357= IFCCARTESIANPOINT((1086.,-533.499999999997));
#51359= IFCCARTESIANPOINT((1086.,-457.500000000007));
#51361= IFCCARTESIANPOINT((-1048.,-457.500000000007));
#51363= IFCCARTESIANPOINT((-1048.,457.500000000002));
#51365= IFCCARTESIANPOINT((1086.,457.500000000002));
#51367= IFCCARTESIANPOINT((1086.,533.500000000003));
#51369= IFCCARTESIANPOINT((-1124.,533.500000000003));
#51371= IFCPOLYLINE((#51355,#51357,#51359,#51361,#51363,#51365,#51367,#51369,#51355));
#51373= IFCARBITRARYCLOSEDPROFILEDEF(.AREA.,'0915 x 2134mm',#51371);
#51374= IFCCARTESIANPOINT((457.500000000003,-25.,1086.));
#51376= IFCAXIS2PLACEMENT3D(#51374,#15,#21);
#51377= IFCEXTRUDEDAREASOLID(#51373,#51376,#19,25.0000000000056);
#51378= IFCCARTESIANPOINT((-5.32907051820075E-15,0.));
#51380= IFCAXIS2PLACEMENT2D(#51378,#23);
#51381= IFCRECTANGLEPROFILEDEF(.AREA.,'0915 x 2134mm',#51380,51.,915.);
#51382= IFCCARTESIANPOINT((457.500000000001,110.,0.));
#51384= IFCAXIS2PLACEMENT3D(#51382,#19,#15);
#51385= IFCEXTRUDEDAREASOLID(#51381,#51384,#19,2134.);
#51386= IFCSTYLEDITEM(#51354,(#35043),$);
#51389= IFCSTYLEDITEM(#51377,(#35043),$);
#51392= IFCSTYLEDITEM(#51385,(#35055),$);
#51395= IFCSHAPEREPRESENTATION(#102,'Body','SweptSolid',(#51354,#51377,#51385));
…Data

29. Acquire properties and geometry data

30. What should we start with?
• IFCRELAGGREGATES entities
• Projects
• Buildings
• BuildingStoreys
• Sites
• Other entities (Stairs, Walls, Curtain Walls, etc)
• IFCRELDEFINESBYPROPERTIES
• IFCRELCONTAINEDINSPATIALSTRUCTURE
• IFCRELASSIGNSTOGROUP

31. To give permission for just part of things
• Isolate elements
• Without breaking the file structure.

32. To give permission for just part of things
Filter
elements
Search all elements
by keywords/
values, such as
Family type,
Object type,
Name,
Properties, etc.
Filter all
relationships
Search all elements
which contain the
ifcId of the filtered
elements, and all
the elements that
contain the
container elements’
ifdIds
Add extra
information
Other information
such as
Organization,
Person,
Application,
Site, etc
Create new
IFC file
Share the file to
groups or users in
the organization

33. Some terms
• IFC Parser / Reader
• IFC Viewer / Publisher - IFC Explorer
• BIM / CIM

34. End of the presentation
Contact BIM Software & 3D Modelling Team, BHTech
www.bhtech.com.vn