# \#ifc5 **URL:** https://forums.buildingsmart.org/tag/ifc5/8.md [Latest](https://forums.buildingsmart.org/latest.md) · [Categories](https://forums.buildingsmart.org/categories.md) · [Tags](https://forums.buildingsmart.org/tags.md) --- ## [Should IFC have a convention that codifies what the representation looks like relative to if the object is ‘cut’ by some camera?](https://forums.buildingsmart.org/t/should-ifc-have-a-convention-that-codifies-what-the-representation-looks-like-relative-to-if-the-object-is-cut-by-some-camera/6291)
**Author:** [@Theoryshaw](https://forums.buildingsmart.org/u/Theoryshaw)\ **Replies:** 2\ **Last updated:** [September 29, 2025, 4:00pm UTC](https://forums.buildingsmart.org/t/should-ifc-have-a-convention-that-codifies-what-the-representation-looks-like-relative-to-if-the-object-is-cut-by-some-camera/6291 "2025-09-29T16:00:16Z")
Should IFC have a convention that codifies what the representation looks like relative to if the object is ‘cut’ by some some camera? Maybe a boolean attribute like TargetCut? Would allow things like door swings to not… --- ## [Unique IDs in IFC5](https://forums.buildingsmart.org/t/unique-ids-in-ifc5/6183)
**Author:** [@Airy59](https://forums.buildingsmart.org/u/Airy59)\ **Replies:** 1\ **Last updated:** [August 23, 2025, 1:59pm UTC](https://forums.buildingsmart.org/t/unique-ids-in-ifc5/6183 "2025-08-23T13:59:28Z")
IFC5 alpha proposes to use unique IDs for “paths”. This choice suggests that unique name assumption is intended (different paths necessarily denote different “things”). Is that the intent? --- ## [IFC class for earthing rod](https://forums.buildingsmart.org/t/ifc-class-for-earthing-rod/5632)
**Author:** [@namio.sousa](https://forums.buildingsmart.org/u/namio.sousa)\ **Replies:** 4\ **Last updated:** [June 26, 2025, 7:55am UTC](https://forums.buildingsmart.org/t/ifc-class-for-earthing-rod/5632 "2025-06-26T07:55:55Z")
Is there any IFC class to classify an earthing rod? --- ## [Technical feedback on IFC5 development - Modularization and structural improvements](https://forums.buildingsmart.org/t/technical-feedback-on-ifc5-development-modularization-and-structural-improvements/5788)
**Author:** [@daviddelven](https://forums.buildingsmart.org/u/daviddelven)\ **Replies:** 6\ **Last updated:** [January 6, 2025, 12:31pm UTC](https://forums.buildingsmart.org/t/technical-feedback-on-ifc5-development-modularization-and-structural-improvements/5788 "2025-01-06T12:31:11Z")
As buildingSMART Spain, we recently published an analysis about IFC5’s development path (available at: The Evolution of IFC: The path to IFC5 - buildingSMART Spain). Following this publication, we received valuable techn… --- ## [Future of IFC5 (academic paper)](https://forums.buildingsmart.org/t/future-of-ifc5-academic-paper/5373)
**Author:** [@marw](https://forums.buildingsmart.org/u/marw)\ **Replies:** 6\ **Last updated:** [May 29, 2024, 8:00pm UTC](https://forums.buildingsmart.org/t/future-of-ifc5-academic-paper/5373 "2024-05-29T20:00:50Z")
I would like to discuss some minor topics related to this paper: "Future of the Industry Foundation Classes: towards IFC 5 " This paper suggests that IFC5 should be modelled as an UML class diagram. The EXPRESS schema… --- ## [Registration is open for the next General Assembly of Implementers](https://forums.buildingsmart.org/t/registration-is-open-for-the-next-general-assembly-of-implementers/5078)
**Author:** [@danlittle](https://forums.buildingsmart.org/u/danlittle)\ **Replies:** 0\ **Last updated:** [December 15, 2023, 10:42am UTC](https://forums.buildingsmart.org/t/registration-is-open-for-the-next-general-assembly-of-implementers/5078 "2023-12-15T10:42:23Z")
The next meeting of the General Assembly of Implementers will take place on Wednesday 7th and Thursday 8th February 2024. The meetings are being sponsored by Oracle and will take place at the Oracle Innovation Lab in… --- ## [Relation between doors to rooms](https://forums.buildingsmart.org/t/relation-between-doors-to-rooms/3961)
**Author:** [@MZibell](https://forums.buildingsmart.org/u/MZibell)\ **Replies:** 5\ **Last updated:** [October 28, 2022, 5:08pm UTC](https://forums.buildingsmart.org/t/relation-between-doors-to-rooms/3961 "2022-10-28T17:08:31Z")
Hi, in our CAFM projects, a frequently occurring requirement to the IFC models is that a door contained in a model provides information on which two rooms it establishes a connection between (e.g. for the locking system… --- ## [Openings with multiple hosts](https://forums.buildingsmart.org/t/openings-with-multiple-hosts/1165)
**Author:** [@jkiss](https://forums.buildingsmart.org/u/jkiss)\ **Replies:** 7\ **Last updated:** [December 16, 2021, 2:42am UTC](https://forums.buildingsmart.org/t/openings-with-multiple-hosts/1165 "2021-12-16T02:42:51Z")
IFC5 schema change request There are cases when a single opening element cuts more than one wall. E.g. in staircases, corner windows or stacked walls. Now it is impossible to export the IfcOpeningElement with more than … --- ## [The future of IFC for Urban Design / Planning / Development](https://forums.buildingsmart.org/t/the-future-of-ifc-for-urban-design-planning-development/3916)
**Author:** [@Maketank](https://forums.buildingsmart.org/u/Maketank)\ **Replies:** 2\ **Last updated:** [October 5, 2021, 8:46pm UTC](https://forums.buildingsmart.org/t/the-future-of-ifc-for-urban-design-planning-development/3916 "2021-10-05T20:46:43Z")
Hello bSI forum, This is an open request for information to insiders within the bSI group about the future of IFC specifications in relation to UIM (urban information model) / CIM (city information models) / CityBIM. I… --- ## [IFC Development Monthly Call - Scheduled Topics](https://forums.buildingsmart.org/t/ifc-development-monthly-call-scheduled-topics/2713)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 3\ **Last updated:** [September 16, 2021, 8:47am UTC](https://forums.buildingsmart.org/t/ifc-development-monthly-call-scheduled-topics/2713 "2021-09-16T08:47:51Z")
As outlined by @berlotti in our first call in April, here is the proposed list of topics/agendas for each monthly call: April 2020: Intro May 2020: Do will still want/need objectified relations and their GUIDs? June… --- ## [New entity needed to IFC5 for mould to represent the mould faces](https://forums.buildingsmart.org/t/new-entity-needed-to-ifc5-for-mould-to-represent-the-mould-faces/1090)
**Author:** [@lassi.liflander](https://forums.buildingsmart.org/u/lassi.liflander)\ **Replies:** 1\ **Last updated:** [June 17, 2021, 11:22pm UTC](https://forums.buildingsmart.org/t/new-entity-needed-to-ifc5-for-mould-to-represent-the-mould-faces/1090 "2021-06-17T23:22:56Z")
For the site fabrication of concrete structures an entity for pours and pour brakes are needed. --- ## [IFC Development Monthly Call - 20 August 2020](https://forums.buildingsmart.org/t/ifc-development-monthly-call-20-august-2020/2896)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 0\ **Last updated:** [August 11, 2020, 3:39pm UTC](https://forums.buildingsmart.org/t/ifc-development-monthly-call-20-august-2020/2896 "2020-08-11T15:39:50Z")
Greetings buildingSMART Technical Community, The next meeting will be 20 August 2020, 13.00 UTC/GMT Topic: Do we want/need IfcOwnerHistory? Topic Summary: While always part of the schema IfcOwnerHistory has had spora… --- ## [IFC for Site, Landscape, and Urban Planning - Call for Participation](https://forums.buildingsmart.org/t/ifc-for-site-landscape-and-urban-planning-call-for-participation/699)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 20\ **Last updated:** [May 13, 2021, 9:04pm UTC](https://forums.buildingsmart.org/t/ifc-for-site-landscape-and-urban-planning-call-for-participation/699 "2021-05-13T21:04:13Z")
For all those interested in expanding the IFC schema and openBIM workflows to include more information about site, landscape, and urban design, please join me in this new project! --- ## [Usage of IfcRepresentationMap::MappingOrigin.](https://forums.buildingsmart.org/t/usage-of-ifcrepresentationmap-mappingorigin/2965)
**Author:** [@hannu.lahtela](https://forums.buildingsmart.org/u/hannu.lahtela)\ **Replies:** 8\ **Last updated:** [April 22, 2021, 11:40am UTC](https://forums.buildingsmart.org/t/usage-of-ifcrepresentationmap-mappingorigin/2965 "2021-04-22T11:40:50Z")
Is there any restriction to use IfcRepresentationMap::MappingOrigin ? Now IfcAxis2Placement3D(origin (0,0,0),,) commonly used (all the buildingSMART examples use it) =\> Some downstream apps (CAD tools (even certified), v… --- ## [IFC Development Monthly Call - 19 November 2020](https://forums.buildingsmart.org/t/ifc-development-monthly-call-19-november-2020/3099)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 3\ **Last updated:** [November 20, 2020, 12:00pm UTC](https://forums.buildingsmart.org/t/ifc-development-monthly-call-19-november-2020/3099 "2020-11-20T12:00:38Z")
Greetings buildingSMART Technical Community, The next meeting will be 19 November 2020, 14.00 GMT Topic: Constraints and IFC Topic Summary: How do we deal with Constraints on/in IFC? Should requirements be represente… --- ## [CSG vs IfcFeatureElement](https://forums.buildingsmart.org/t/csg-vs-ifcfeatureelement/2115)
**Author:** [@igor.sokolov](https://forums.buildingsmart.org/u/igor.sokolov)\ **Replies:** 7\ **Last updated:** [November 12, 2020, 5:08am UTC](https://forums.buildingsmart.org/t/csg-vs-ifcfeatureelement/2115 "2020-11-12T05:08:58Z")
There is no specific relation for IfcSurfaceFeature in IFC4 What is the need to have 2 alternatives, CSG and IfcFeatureElement? I would suggest to IFC5 a relation from IfcProduct to IfcBooleanOperand instead. Ad… --- ## [IfcIndexedTextureMap is missing a subtype for textures for IfcPolygonalFaceSet](https://forums.buildingsmart.org/t/ifcindexedtexturemap-is-missing-a-subtype-for-textures-for-ifcpolygonalfaceset/2620)
**Author:** [@trondholen](https://forums.buildingsmart.org/u/trondholen)\ **Replies:** 1\ **Last updated:** [June 5, 2020, 11:50am UTC](https://forums.buildingsmart.org/t/ifcindexedtexturemap-is-missing-a-subtype-for-textures-for-ifcpolygonalfaceset/2620 "2020-06-05T11:50:09Z")
https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2\_TC1/HTML/link/ifcindexedtexturemap.htm Here it states: " Subtypes of IfcIndexedTextureMap establish the index attribute corresponding to subtypes of IfcTessella… --- ## [IFC Development Monthly Call - 21 May 2020](https://forums.buildingsmart.org/t/ifc-development-monthly-call-21-may-2020/2692)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 13\ **Last updated:** [May 21, 2020, 5:24pm UTC](https://forums.buildingsmart.org/t/ifc-development-monthly-call-21-may-2020/2692 "2020-05-21T17:24:43Z")
Greeting buildingSMART Technical Community, The next meeting will be 21 May 2020, 13.00 UTC/GMT The topic for this meeting: Do we want/need objectified relations and do they need GUIDs? Please refer to Minimize Relati… --- ## [IFC structure improvement](https://forums.buildingsmart.org/t/ifc-structure-improvement/2468)
**Author:** [@ReD\_CoDE](https://forums.buildingsmart.org/u/ReD_CoDE)\ **Replies:** 4\ **Last updated:** [March 25, 2020, 2:05pm UTC](https://forums.buildingsmart.org/t/ifc-structure-improvement/2468 "2020-03-25T14:05:11Z")
Dear friends, Do you think is it possible to change IFC structure a little bit? The main one is: Occurrences and types are further subdivided into six fundamental concepts: actors (“who”), controls (“why”), groups (“… --- ## [Evolution of IFC: improving consistency and language independent data schema](https://forums.buildingsmart.org/t/evolution-of-ifc-improving-consistency-and-language-independent-data-schema/2457)
**Author:** [@berlotti](https://forums.buildingsmart.org/u/berlotti)\ **Replies:** 1\ **Last updated:** [March 16, 2020, 11:15pm UTC](https://forums.buildingsmart.org/t/evolution-of-ifc-improving-consistency-and-language-independent-data-schema/2457 "2020-03-16T23:15:50Z")
In the evolution of IFC, it is time to work towards a technology independent data schema. This is also the time to improve consistency and remove redundancy. Therefore we started collecting issues on the GitHub issue lis… --- ## [IfcX and IfcLite projects](https://forums.buildingsmart.org/t/ifcx-and-ifclite-projects/1440)
**Author:** [@ReD\_CoDE](https://forums.buildingsmart.org/u/ReD_CoDE)\ **Replies:** 16\ **Last updated:** [February 27, 2020, 7:12am UTC](https://forums.buildingsmart.org/t/ifcx-and-ifclite-projects/1440 "2020-02-27T07:12:53Z")
The AECOO industry has some barriers, especially related to IFC, so I decided to work on two important areas besides our startup: IfcX, the next generation of IfcDoc. An easy to use web-based IfcDoc https://www.resea… --- ## [Decoupling Model and Data/Information (IFC & ISO 19650)](https://forums.buildingsmart.org/t/decoupling-model-and-data-information-ifc-iso-19650/1819)
**Author:** [@ReD\_CoDE](https://forums.buildingsmart.org/u/ReD_CoDE)\ **Replies:** 13\ **Last updated:** [February 16, 2020, 10:23am UTC](https://forums.buildingsmart.org/t/decoupling-model-and-data-information-ifc-iso-19650/1819 "2020-02-16T10:23:25Z")
Would be happy to know your view about separating the model and its data/information and join data/information to the model based on tasks/“information need” For instance, for AIM or FIM, companies will provide a highly… --- ## [IFC SQLite Project](https://forums.buildingsmart.org/t/ifc-sqlite-project/1359)
**Author:** [@ReD\_CoDE](https://forums.buildingsmart.org/u/ReD_CoDE)\ **Replies:** 5\ **Last updated:** [February 13, 2020, 5:11pm UTC](https://forums.buildingsmart.org/t/ifc-sqlite-project/1359 "2020-02-13T17:11:15Z")
Dear friends, Do you think finishing some unfinished projects like IFC SQLite will help and speed up IFC development and implementation or not? Some say yes and some say no Would be happy to hear from you, Kind regar… --- ## [IfcOwnerHistory](https://forums.buildingsmart.org/t/ifcownerhistory/2246)
**Author:** [@ReD\_CoDE](https://forums.buildingsmart.org/u/ReD_CoDE)\ **Replies:** 27\ **Last updated:** [January 15, 2020, 4:22pm UTC](https://forums.buildingsmart.org/t/ifcownerhistory/2246 "2020-01-15T16:22:31Z")
Hi all, IfcOwnerHistory defines all history and identification related information. In order to provide fast access it is directly attached to all independent objects, relationships and properties. IfcOwnerHistory is … --- ## [IFC Modularisation: current status and request for feedback](https://forums.buildingsmart.org/t/ifc-modularisation-current-status-and-request-for-feedback/2054)
**Author:** [@berlotti](https://forums.buildingsmart.org/u/berlotti)\ **Replies:** 106\ **Last updated:** [January 7, 2020, 6:10am UTC](https://forums.buildingsmart.org/t/ifc-modularisation-current-status-and-request-for-feedback/2054 "2020-01-07T06:10:53Z")
Hi all, There have been some efforts going on to modularise IFC (again). It is crucial for IFC to become modulair for future maintainability and for interoperability between multiple domains. The following presentatio… --- ## [Extending Ifc for IT Security](https://forums.buildingsmart.org/t/extending-ifc-for-it-security/2183)
**Author:** [@WonderIf](https://forums.buildingsmart.org/u/WonderIf)\ **Replies:** 2\ **Last updated:** [December 23, 2019, 2:18pm UTC](https://forums.buildingsmart.org/t/extending-ifc-for-it-security/2183 "2019-12-23T14:18:43Z")
Hi, I would like to express some IT security facts about building automation devices. My conclusion so far is that there is little work done in relation with It security. Thus I have to extend some IFC schemas ( IFC… --- ## [How to define the geometry of a rail](https://forums.buildingsmart.org/t/how-to-define-the-geometry-of-a-rail/2130)
**Author:** [@matthias.frei](https://forums.buildingsmart.org/u/matthias.frei)\ **Replies:** 1\ **Last updated:** [December 9, 2019, 7:50pm UTC](https://forums.buildingsmart.org/t/how-to-define-the-geometry-of-a-rail/2130 "2019-12-09T19:50:20Z")
Dear IfcRail project team, we are a software vendor interested in implementing the candidate standard published recently. We have stumbled upon a question, where we cannot find the relevant Information: How can we defin… --- ## [Design Options + Units + Color](https://forums.buildingsmart.org/t/design-options-units-color/2006)
**Author:** [@ReD\_CoDE](https://forums.buildingsmart.org/u/ReD_CoDE)\ **Replies:** 9\ **Last updated:** [December 2, 2019, 12:58pm UTC](https://forums.buildingsmart.org/t/design-options-units-color/2006 "2019-12-02T12:58:53Z")
Does IFC4 support Design Options? Also, IfcColourRgb is based on 3 channels, Red, Green, Blue, in the range of 0.0 ... 1.0, so does it support some 4 channels technologies like WebGL? Also, does a range of 0.0 ..… --- ## [IFC & Data/Information](https://forums.buildingsmart.org/t/ifc-data-information/1930)
**Author:** [@ReD\_CoDE](https://forums.buildingsmart.org/u/ReD_CoDE)\ **Replies:** 0\ **Last updated:** [October 21, 2019, 11:27am UTC](https://forums.buildingsmart.org/t/ifc-data-information/1930 "2019-10-21T11:27:57Z")
Hi all, I clearly understand the logic behind the UserDefined to give enough freedom to the end-user (Convergence = Standardization & Divergence = Non-standardization) However, I think it’s the time to improve Psets, Q… --- ## [MaterialPass (Material Passport)](https://forums.buildingsmart.org/t/materialpass-material-passport/1901)
**Author:** [@ReD\_CoDE](https://forums.buildingsmart.org/u/ReD_CoDE)\ **Replies:** 0\ **Last updated:** [October 9, 2019, 3:38pm UTC](https://forums.buildingsmart.org/t/materialpass-material-passport/1901 "2019-10-09T15:38:15Z")
These days I’m thinking of IFC-based Material Passport through PBR materials plus simulation technologies/methodologies called MaterialPass (MaterialPass.org) ------------------------------------------------------------… [Next page](https://forums.buildingsmart.org/tag/ifc5/8.md?match_all_tags=true&page=1&tags%5B%5D=ifc5)