# Uncategorized **URL:** https://forums.buildingsmart.org/c/uncategorized/1.md [Latest](https://forums.buildingsmart.org/latest.md) · [Categories](https://forums.buildingsmart.org/categories.md) · [Tags](https://forums.buildingsmart.org/tags.md) --- ## [If you’re an expert in the electrical domain of IFC, the following conversation might interest you…](https://forums.buildingsmart.org/t/if-you-re-an-expert-in-the-electrical-domain-of-ifc-the-following-conversation-might-interest-you/6411)
**Author:** [@Theoryshaw](https://forums.buildingsmart.org/u/Theoryshaw)\ **Replies:** 0\ **Last updated:** [January 29, 2026, 3:49pm UTC](https://forums.buildingsmart.org/t/if-you-re-an-expert-in-the-electrical-domain-of-ifc-the-following-conversation-might-interest-you/6411 "2026-01-29T15:49:56Z")
If you’re an expert in the electrical domain of IFC, the following conversation might interest you… --- ## [List of geometrical concepts in IFC for alignment to other standards](https://forums.buildingsmart.org/t/list-of-geometrical-concepts-in-ifc-for-alignment-to-other-standards/6377)
**Author:** [@aothms](https://forums.buildingsmart.org/u/aothms)\ **Replies:** 0\ **Last updated:** [January 6, 2026, 1:19pm UTC](https://forums.buildingsmart.org/t/list-of-geometrical-concepts-in-ifc-for-alignment-to-other-standards/6377 "2026-01-06T13:19:12Z")
Dear all, I’m compiling a list of geometrical concepts / paradigms in IFC. Essentially everything that relates to geometry in some way. The purpose is for alignment to other standards. I’d be grateful if you could have … --- ## [2025: The Year in Review](https://forums.buildingsmart.org/t/2025-the-year-in-review/6373)
**Author:** [@system](https://forums.buildingsmart.org/u/system)\ **Replies:** 2\ **Last updated:** [January 1, 2026, 10:36pm UTC](https://forums.buildingsmart.org/t/2025-the-year-in-review/6373 "2026-01-01T22:36:48Z")
2025's Top Users Most Time Reading User Hours Read @jwouellette 3 @michelangelo 2 @Dieter-Hubertson 1 @bhargava.abhishek 1 @daviddelven 1 @PepaR 1 @stefkeB 1 @aothms 1 @cmellueh 1 @J… --- ## [IFC 4.3 Backlog and Release Notes](https://forums.buildingsmart.org/t/ifc-4-3-backlog-and-release-notes/6367)
**Author:** [@bhargava.abhishek](https://forums.buildingsmart.org/u/bhargava.abhishek)\ **Replies:** 0\ **Last updated:** [December 23, 2025, 3:45am UTC](https://forums.buildingsmart.org/t/ifc-4-3-backlog-and-release-notes/6367 "2025-12-23T03:45:49Z")
Looking for (a) IFC 4.x3 Issues/Features backlog and (b) detailed release notes. Issues/Features Backlog: For the backlog, looking for list of issues/features that have been reported/created by bSI and Stakeholders to … --- ## [Why are IfcBridge and IfcRailway defined in differnet layers?](https://forums.buildingsmart.org/t/why-are-ifcbridge-and-ifcrailway-defined-in-differnet-layers/4888)
**Author:** [@Feifei](https://forums.buildingsmart.org/u/Feifei)\ **Replies:** 3\ **Last updated:** [November 17, 2025, 6:38pm UTC](https://forums.buildingsmart.org/t/why-are-ifcbridge-and-ifcrailway-defined-in-differnet-layers/4888 "2025-11-17T18:38:14Z")
In IFC 4.3.1, both IfcBridge and IfcRailway are derived from IfcFacility, but IfcBridge (and IfcBuilding) is defined in the Core Layer 5.4.3.7, and IfcRailway (and IfcRoad, IfcMaringFacility) is defined in the Domain Lay… --- ## [ifc Functional Parts ERD/UML](https://forums.buildingsmart.org/t/ifc-functional-parts-erd-uml/6332)
**Author:** [@bhargava.abhishek](https://forums.buildingsmart.org/u/bhargava.abhishek)\ **Replies:** 1\ **Last updated:** [November 16, 2025, 2:10pm UTC](https://forums.buildingsmart.org/t/ifc-functional-parts-erd-uml/6332 "2025-11-16T14:10:15Z")
For the IFC Functional Parts, looking for UML or ERD that reflects the IFC concepts associated with each part, their relationships and other associated IFC schema elements (e.g. property sets, properties, etc). So fa… --- ## [Error accessing https://ifc43-docs.standards.buildingsmart.org/ today](https://forums.buildingsmart.org/t/error-accessing-https-ifc43-docs-standards-buildingsmart-org-today/6330)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 4\ **Last updated:** [November 13, 2025, 5:28pm UTC](https://forums.buildingsmart.org/t/error-accessing-https-ifc43-docs-standards-buildingsmart-org-today/6330 "2025-11-13T17:28:46Z")
From my end, I’m getting a HTTPS error from https://ifc43-docs.standards.buildingsmart.org/ The error is that the security certificate has expired (no longer https:). Can anyone else verify? --- ## [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… --- ## [IFC 3D symbols with Psets as part of a national library](https://forums.buildingsmart.org/t/ifc-3d-symbols-with-psets-as-part-of-a-national-library/6264)
**Author:** [@Karin](https://forums.buildingsmart.org/u/Karin)\ **Replies:** 1\ **Last updated:** [August 26, 2025, 3:26pm UTC](https://forums.buildingsmart.org/t/ifc-3d-symbols-with-psets-as-part-of-a-national-library/6264 "2025-08-26T15:26:35Z")
At the Swedish transport administration we currently hold a library of 3D and 2D symbols with required properties as dgn and dwg. At the start of a project this library is shared with the assigned parties in a contract. … --- ## [Applicability for all Elements](https://forums.buildingsmart.org/t/applicability-for-all-elements/6234)
**Author:** [@CipZip](https://forums.buildingsmart.org/u/CipZip)\ **Replies:** 5\ **Last updated:** [August 11, 2025, 8:16am UTC](https://forums.buildingsmart.org/t/applicability-for-all-elements/6234 "2025-08-11T08:16:21Z")
Hi, I am currently writing IDS file for our BuildIM format which we use for evaluating IFC models. We are setting unique parameters to ech element inside Autodesk Revit and we need to later check with IDS that all Elemen… --- ## [The PredefinedType shall only be used...](https://forums.buildingsmart.org/t/the-predefinedtype-shall-only-be-used/6180)
**Author:** [@Simon](https://forums.buildingsmart.org/u/Simon)\ **Replies:** 4\ **Last updated:** [July 2, 2025, 12:19pm UTC](https://forums.buildingsmart.org/t/the-predefinedtype-shall-only-be-used/6180 "2025-07-02T12:19:19Z")
My question: is it possible to check the following using IDS? I’ve tried for several hours but each IDS iteration either doesn’t work - it does’t find the error - or is ‘invalid’. I’ve received an Ifc4 (ReferenceView\_V1… --- ## [BCF v. 2.1](https://forums.buildingsmart.org/t/bcf-v-2-1/6178)
**Author:** [@RenzoVenuti](https://forums.buildingsmart.org/u/RenzoVenuti)\ **Replies:** 0\ **Last updated:** [June 26, 2025, 1:51pm UTC](https://forums.buildingsmart.org/t/bcf-v-2-1/6178 "2025-06-26T13:51:46Z")
in BCF v.2.1 what is the correct form : or Thanks --- ## [IFC 5 and Guid format](https://forums.buildingsmart.org/t/ifc-5-and-guid-format/6164)
**Author:** [@RenzoVenuti](https://forums.buildingsmart.org/u/RenzoVenuti)\ **Replies:** 1\ **Last updated:** [June 25, 2025, 10:12am UTC](https://forums.buildingsmart.org/t/ifc-5-and-guid-format/6164 "2025-06-25T10:12:15Z")
I’m looking at the ifc 5 master and I noticed that the guid format is changed from 22 characters to 32, but this way I don’t lose the references to the objects stored with the old format? --- ## [Comment line in IFC](https://forums.buildingsmart.org/t/comment-line-in-ifc/6146)
**Author:** [@Hans\_Lammerts](https://forums.buildingsmart.org/u/Hans_Lammerts)\ **Replies:** 3\ **Last updated:** [June 11, 2025, 5:13pm UTC](https://forums.buildingsmart.org/t/comment-line-in-ifc/6146 "2025-06-11T17:13:41Z")
Just wanna check if this is the right way to implement comments in IFC. Is it correct? --- ## [Exporting Models Data to DB in a Reliable and Useful Manner](https://forums.buildingsmart.org/t/exporting-models-data-to-db-in-a-reliable-and-useful-manner/6034)
**Author:** [@saved](https://forums.buildingsmart.org/u/saved)\ **Replies:** 5\ **Last updated:** [March 31, 2025, 11:52am UTC](https://forums.buildingsmart.org/t/exporting-models-data-to-db-in-a-reliable-and-useful-manner/6034 "2025-03-31T11:52:32Z")
Hi everyone, I am relatively new to the Revit and BIM modeling world. I am a Junior Data Specialist working with Buildings and Civil Engineers, I’ve been assigned, as a task for a bigger project, the handling of data. I… --- ## [Where are the Signal Assembly examples cited in the IFC4x3 documentation?](https://forums.buildingsmart.org/t/where-are-the-signal-assembly-examples-cited-in-the-ifc4x3-documentation/6001)
**Author:** [@Rick\_Brice](https://forums.buildingsmart.org/u/Rick_Brice)\ **Replies:** 0\ **Last updated:** [March 8, 2025, 11:11pm UTC](https://forums.buildingsmart.org/t/where-are-the-signal-assembly-examples-cited-in-the-ifc4x3-documentation/6001 "2025-03-08T23:11:05Z")
The documentation for both IfcSign and IfcSignal direct the reader to “see Signal Assembly for examples.” Where are the signal assembly examples? The documentation does not have links for the examples, nor are the liste… --- ## [IFC type for a pipe fitting](https://forums.buildingsmart.org/t/ifc-type-for-a-pipe-fitting/5780)
**Author:** [@namio.sousa](https://forums.buildingsmart.org/u/namio.sousa)\ **Replies:** 2\ **Last updated:** [February 11, 2025, 9:56pm UTC](https://forums.buildingsmart.org/t/ifc-type-for-a-pipe-fitting/5780 "2025-02-11T21:56:40Z")
Hello averybody. Which pipe fitting type best classify a Plug? --- ## [2024: The Year in Review](https://forums.buildingsmart.org/t/2024-the-year-in-review/5846)
**Author:** [@system](https://forums.buildingsmart.org/u/system)\ **Replies:** 4\ **Last updated:** [January 1, 2025, 2:33pm UTC](https://forums.buildingsmart.org/t/2024-the-year-in-review/5846 "2025-01-01T14:33:40Z")
2024's Top Users Most Time Reading User Hours Read @JoëlM 7 @RenzoVenuti 4 @michelangelo 3 @jwouellette 3 @stefkeB 2 @daviddelven 2 @marw 2 @schilu 2 @AntonioCWD 1 @IFCWebServer 1 … --- ## [IDS - Allowing two entities, but they have different PrefinedTypes](https://forums.buildingsmart.org/t/ids-allowing-two-entities-but-they-have-different-prefinedtypes/5794)
**Author:** [@fmohus](https://forums.buildingsmart.org/u/fmohus)\ **Replies:** 2\ **Last updated:** [December 18, 2024, 11:54am UTC](https://forums.buildingsmart.org/t/ids-allowing-two-entities-but-they-have-different-prefinedtypes/5794 "2024-12-18T11:54:42Z")
I am trying to specity a situation where both IfcSpatialZone and IfcSpace are allowed entities for setting up so called “Functional Unit” zones in the IFC 4 model. A modeller using IfcSpatialZone shall set Predefined ty… --- ## [Requiring the existence of Predefined Type](https://forums.buildingsmart.org/t/requiring-the-existence-of-predefined-type/5760)
**Author:** [@fmohus](https://forums.buildingsmart.org/u/fmohus)\ **Replies:** 3\ **Last updated:** [November 13, 2024, 2:44pm UTC](https://forums.buildingsmart.org/t/requiring-the-existence-of-predefined-type/5760 "2024-11-13T14:44:00Z")
We are trying to set up an IDS specification that requires the existence of PredefinedType for certain entities. A typcical example would be IfcCovering where we need PredefinedType to be able to distinguish between CEIL… --- ## [Glazing information for curtain wall panels](https://forums.buildingsmart.org/t/glazing-information-for-curtain-wall-panels/5727)
**Author:** [@Moult](https://forums.buildingsmart.org/u/Moult)\ **Replies:** 0\ **Last updated:** [November 1, 2024, 2:43am UTC](https://forums.buildingsmart.org/t/glazing-information-for-curtain-wall-panels/5727 "2024-11-01T02:43:47Z")
It had always been “the way” in IFC such that the glazing panel in a curtain wall was classified as an IfcPlate.CURTAIN\_PANEL. However I’m increasingly questioning this. I’ve been recently working a lot with trying to d… --- ## [IDS and Federated IFC file](https://forums.buildingsmart.org/t/ids-and-federated-ifc-file/5654)
**Author:** [@RenzoVenuti](https://forums.buildingsmart.org/u/RenzoVenuti)\ **Replies:** 4\ **Last updated:** [September 26, 2024, 2:18pm UTC](https://forums.buildingsmart.org/t/ids-and-federated-ifc-file/5654 "2024-09-26T14:18:56Z")
Since there is the possibility of federating the various ifc models in a single IFC file, I believe the need will arise to unite all the various ids that validate the various models that make up the federated model. Is t… --- ## [bSDD translated dictionary does show translated Description](https://forums.buildingsmart.org/t/bsdd-translated-dictionary-does-show-translated-description/5552)
**Author:** [@MennoMekes](https://forums.buildingsmart.org/u/MennoMekes)\ **Replies:** 3\ **Last updated:** [August 21, 2024, 11:46am UTC](https://forums.buildingsmart.org/t/bsdd-translated-dictionary-does-show-translated-description/5552 "2024-08-21T11:46:31Z")
Hi, does someone know why the translated Descriptions in the dictionary are not showing? in the picture below: 1: original Dutch dictionary header 2: translated dictionary header 3: Description in Dutch in the bSDD … --- ## [IfcColour list](https://forums.buildingsmart.org/t/ifccolour-list/2772)
**Author:** [@pilarjimenez](https://forums.buildingsmart.org/u/pilarjimenez)\ **Replies:** 5\ **Last updated:** [June 29, 2024, 9:59am UTC](https://forums.buildingsmart.org/t/ifccolour-list/2772 "2024-06-29T09:59:33Z")
Hello everyone Is there any software or tool that list all ifccolour in a group of federated IFC files: RGB numbers and RGB colour? Thank you in advance Pilar --- ## [How to extrude a square, rectangular,... section along a polyline passing through many points?](https://forums.buildingsmart.org/t/how-to-extrude-a-square-rectangular-section-along-a-polyline-passing-through-many-points/5437)
**Author:** [@NTD](https://forums.buildingsmart.org/u/NTD)\ **Replies:** 4\ **Last updated:** [June 19, 2024, 6:53am UTC](https://forums.buildingsmart.org/t/how-to-extrude-a-square-rectangular-section-along-a-polyline-passing-through-many-points/5437 "2024-06-19T06:53:21Z")
Here is the code for swept\_curve builder = ifcopenshell.util.shape\_builder.ShapeBuilder(model) Sweep a 10mm radius disk along a polyline with a couple of straight segments and an arc. curve = builder.polyline( \[(10., … --- ## [How to interpretate project, block and building number in the hierarchic structure IFC4?](https://forums.buildingsmart.org/t/how-to-interpretate-project-block-and-building-number-in-the-hierarchic-structure-ifc4/5298)
**Author:** [@MikeBerghuis](https://forums.buildingsmart.org/u/MikeBerghuis)\ **Replies:** 0\ **Last updated:** [April 12, 2024, 8:37am UTC](https://forums.buildingsmart.org/t/how-to-interpretate-project-block-and-building-number-in-the-hierarchic-structure-ifc4/5298 "2024-04-12T08:37:35Z")
Hello there! Currently, as a company, we are delving deeper into the IFC structures. This IFC structure provides us with guidance on where certain parameters with parameter values will be places. For physical objects suc… --- ## [Query on IFC valid assembly structure](https://forums.buildingsmart.org/t/query-on-ifc-valid-assembly-structure/5227)
**Author:** [@AMITHSINGH](https://forums.buildingsmart.org/u/AMITHSINGH)\ **Replies:** 12\ **Last updated:** [April 2, 2024, 9:23am UTC](https://forums.buildingsmart.org/t/query-on-ifc-valid-assembly-structure/5227 "2024-04-02T09:23:06Z")
Hello All, We received an IFC file having below assembly structure, Is it valid and acceptable IFC assembly structure ? Does this assembly structure fits in Buildingsmart standards ? ifcProject ifcSite ifcBuilding i… --- ## [IFCBUILDINGELEMENTPROXY - 6th parameter to be default](https://forums.buildingsmart.org/t/ifcbuildingelementproxy-6th-parameter-to-be-default/5260)
**Author:** [@LPr](https://forums.buildingsmart.org/u/LPr)\ **Replies:** 2\ **Last updated:** [April 1, 2024, 7:49am UTC](https://forums.buildingsmart.org/t/ifcbuildingelementproxy-6th-parameter-to-be-default/5260 "2024-04-01T07:49:20Z")
Hello, I have a sample which uses /\* #1000= IFCBUILDINGELEMENTPROXY('1kTvXnbbzCWw8lcMd1dR4o',$,'P-1','sample proxy',$,#1001,#1010,$,$); \*/ /\* \<\<\<\< This was OK \*/ #1000= IFCBUILDINGELEMENTPROXY('1kTvXnbbzCWw8lcMd… --- ## [Convert/upgrade ifc2x3 to ifc4?](https://forums.buildingsmart.org/t/convert-upgrade-ifc2x3-to-ifc4/5210)
**Author:** [@SelmaBlix](https://forums.buildingsmart.org/u/SelmaBlix)\ **Replies:** 4\ **Last updated:** [March 27, 2024, 11:26am UTC](https://forums.buildingsmart.org/t/convert-upgrade-ifc2x3-to-ifc4/5210 "2024-03-27T11:26:42Z")
Hi, I wonder if there a way to convert/upgrade an ifc 2x3 to ifc4? The ifc 2x3 was created in revit but I don’t have access to it so I wonder if there is a way to work around it with the upgrade. I wanna open it in arch… --- ## [IFC tags](https://forums.buildingsmart.org/t/ifc-tags/5249)
**Author:** [@LPr](https://forums.buildingsmart.org/u/LPr)\ **Replies:** 1\ **Last updated:** [March 22, 2024, 9:53am UTC](https://forums.buildingsmart.org/t/ifc-tags/5249 "2024-03-22T09:53:19Z")
Hello, I would like to learn abot parametres to IFC “instructions” within IFC file. E.g. “IFCCARTESIANPOINT” - here it’s clear that the instruction takes one point of x, y and z coordinates. But what about “IFCGEOMETRIC… [Next page](https://forums.buildingsmart.org/c/uncategorized/1.md?page=1)