# \#ifc **URL:** https://forums.buildingsmart.org/tag/ifc/24.md [Latest](https://forums.buildingsmart.org/latest.md) · [Categories](https://forums.buildingsmart.org/categories.md) · [Tags](https://forums.buildingsmart.org/tags.md) --- ## [Open Data Optimization: Real-Time Urban Spatial Layouts (MPT Math) Syncing to BIM Models](https://forums.buildingsmart.org/t/open-data-optimization-real-time-urban-spatial-layouts-mpt-math-syncing-to-bim-models/6564)
**Author:** [@sherifmagd](https://forums.buildingsmart.org/u/sherifmagd)\ **Replies:** 0\ **Last updated:** [August 29, 2026, 11:36am UTC](https://forums.buildingsmart.org/t/open-data-optimization-real-time-urban-spatial-layouts-mpt-math-syncing-to-bim-models/6564 "2026-08-29T11:36:30Z")
Hello buildingSMART Community, I wanted to share an open-source workflow research project I recently completed for a Devpost hackathon called “BIM MPT Urban Optimize.” The project explores how we can leverage external o… --- ## [Storing environmental impact values in IFC](https://forums.buildingsmart.org/t/storing-environmental-impact-values-in-ifc/5239)
**Author:** [@artur\_tomczak](https://forums.buildingsmart.org/u/artur_tomczak)\ **Replies:** 12\ **Last updated:** [April 21, 2026, 2:01pm UTC](https://forums.buildingsmart.org/t/storing-environmental-impact-values-in-ifc/5239 "2026-04-21T14:01:58Z")
As a Strategic Sustainability Group of buildingSMART, we faced the challenge of storing tabular values in IFC models. While this is possible with IFC, we encountered problems with the usability of such data given the lim… --- ## [Correct Use of IFC Name and Reference (deprecated?)](https://forums.buildingsmart.org/t/correct-use-of-ifc-name-and-reference-deprecated/6429)
**Author:** [@victorgm](https://forums.buildingsmart.org/u/victorgm)\ **Replies:** 8\ **Last updated:** [March 11, 2026, 1:57pm UTC](https://forums.buildingsmart.org/t/correct-use-of-ifc-name-and-reference-deprecated/6429 "2026-03-11T13:57:07Z")
Hello everyone, we are currently refining our office IFC workflow (based on Allplan 2025), and several questions came up regarding the correct use of Name, Reference and Predefined Type. From our understanding, Name is… --- ## [Actor Assignment - clarifications on specification and usage](https://forums.buildingsmart.org/t/actor-assignment-clarifications-on-specification-and-usage/6305)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 1\ **Last updated:** [January 7, 2026, 7:15pm UTC](https://forums.buildingsmart.org/t/actor-assignment-clarifications-on-specification-and-usage/6305 "2026-01-07T19:15:31Z")
Can we get some clarification on the specification and usage of IfcActor, including IfcPerson, IfcOrganization, and IfcPersonAndOrganization? Our previous assumptions and efforts were all smashed by previous consultation… --- ## [Nesting IfcMaterialLayers, IfcMaterialConstituents ((ABS)IfcMaterialDefinition instead of IfcMaterial)](https://forums.buildingsmart.org/t/nesting-ifcmateriallayers-ifcmaterialconstituents-abs-ifcmaterialdefinition-instead-of-ifcmaterial/6345)
**Author:** [@jakob-beetz](https://forums.buildingsmart.org/u/jakob-beetz)\ **Replies:** 0\ **Last updated:** [November 28, 2025, 11:16am UTC](https://forums.buildingsmart.org/t/nesting-ifcmateriallayers-ifcmaterialconstituents-abs-ifcmaterialdefinition-instead-of-ifcmaterial/6345 "2025-11-28T11:16:13Z")
Hi all, I wonder what the reasoning behind the “limitation” of IfcMaterialLayer and IfcMaterialConstituent on the Material attributes are to be of type IfcMaterial instead of allowing abstract IfcMaterialDefinition . U… --- ## [IFC to GIS](https://forums.buildingsmart.org/t/ifc-to-gis/6115)
**Author:** [@PepaR](https://forums.buildingsmart.org/u/PepaR)\ **Replies:** 7\ **Last updated:** [October 31, 2025, 8:22pm UTC](https://forums.buildingsmart.org/t/ifc-to-gis/6115 "2025-10-31T20:22:22Z")
Hello, We are trying to optimize the workflow for transferring geometry and information from IFC to the GIS system. Does anyone have any experience to share on this topic? --- ## [🌍 Translations added to the IFC4.3 dev server](https://forums.buildingsmart.org/t/translations-added-to-the-ifc4-3-dev-server/6299)
**Author:** [@aothms](https://forums.buildingsmart.org/u/aothms)\ **Replies:** 0\ **Last updated:** [October 7, 2025, 3:34pm UTC](https://forums.buildingsmart.org/t/translations-added-to-the-ifc4-3-dev-server/6299 "2025-10-07T15:34:57Z")
Happy to inform you that the great work from Geert Hesselink to integrate the translations into the IFC4.3 live development platform is now live. See below in the inline image where, based on the dropdown box where end-u… --- ## [Clarification IfcRelAssignsToActor\> ActingRole and IfcPerson/IfcOrganization\>Role](https://forums.buildingsmart.org/t/clarification-ifcrelassignstoactor-actingrole-and-ifcperson-ifcorganization-role/6198)
**Author:** [@Dimitrios](https://forums.buildingsmart.org/u/Dimitrios)\ **Replies:** 0\ **Last updated:** [July 9, 2025, 1:53pm UTC](https://forums.buildingsmart.org/t/clarification-ifcrelassignstoactor-actingrole-and-ifcperson-ifcorganization-role/6198 "2025-07-09T13:53:56Z")
The “5.1.3.22 IfcRelAssignsToActor - IFC 4.3.2 Documentation” relation contains an attribute “ActingRole”. Is that attribute adhering to the roles assigned to “IfcOrganization”/ “IfcPerson” to which the “IfcActor” is ref… --- ## [Pset for external influences (electrical installations of buildings)](https://forums.buildingsmart.org/t/pset-for-external-influences-electrical-installations-of-buildings/6196)
**Author:** [@PepaR](https://forums.buildingsmart.org/u/PepaR)\ **Replies:** 0\ **Last updated:** [July 7, 2025, 6:54am UTC](https://forums.buildingsmart.org/t/pset-for-external-influences-electrical-installations-of-buildings/6196 "2025-07-07T06:54:38Z")
Hello, I would like to ask what property set you use for external influences related standard IEC 60364-5-51 Electrical installations of buildings - Part 5-51: Selection and erection of electrical equipment - Common rul… --- ## [Door: OverallHeight](https://forums.buildingsmart.org/t/door-overallheight/6123)
**Author:** [@PepaR](https://forums.buildingsmart.org/u/PepaR)\ **Replies:** 3\ **Last updated:** [June 4, 2025, 10:00am UTC](https://forums.buildingsmart.org/t/door-overallheight/6123 "2025-06-04T10:00:41Z")
Hello, I would like ask what exactly is OverallHeight, please? Is it Height A, B, C, D or E? --- ## [Door: Clear Width and Height](https://forums.buildingsmart.org/t/door-clear-width-and-height/6124)
**Author:** [@PepaR](https://forums.buildingsmart.org/u/PepaR)\ **Replies:** 2\ **Last updated:** [June 4, 2025, 9:00am UTC](https://forums.buildingsmart.org/t/door-clear-width-and-height/6124 "2025-06-04T09:00:35Z")
Hello, I would like ask what is your recomendation how to get clear width and height for door, please? --- ## [Verification Needed: Connecting Sensors/Controllers](https://forums.buildingsmart.org/t/verification-needed-connecting-sensors-controllers/6126)
**Author:** [@shihangzhang](https://forums.buildingsmart.org/u/shihangzhang)\ **Replies:** 0\ **Last updated:** [May 19, 2025, 7:01am UTC](https://forums.buildingsmart.org/t/verification-needed-connecting-sensors-controllers/6126 "2025-05-19T07:01:24Z")
I’m implementing control system components in IFC and need verification on my connection approach. According to the buildingSMART documentation, the recommended way is to connect outputs to inputs through Port Nesting pr… --- ## [IFC materials](https://forums.buildingsmart.org/t/ifc-materials/4861)
**Author:** [@pilarjimenez](https://forums.buildingsmart.org/u/pilarjimenez)\ **Replies:** 4\ **Last updated:** [April 22, 2025, 10:16am UTC](https://forums.buildingsmart.org/t/ifc-materials/4861 "2025-04-22T10:16:36Z")
When a user of IFC models without being an expert in the schematic wants to obtain a list of all the materials applied in the multiple ifc files that make up a model, which entities should he call? In the 4x3 schema ther… --- ## [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… --- ## [Best IFC classification for a reducing coupling](https://forums.buildingsmart.org/t/best-ifc-classification-for-a-reducing-coupling/5963)
**Author:** [@namio.sousa](https://forums.buildingsmart.org/u/namio.sousa)\ **Replies:** 3\ **Last updated:** [March 11, 2025, 3:40pm UTC](https://forums.buildingsmart.org/t/best-ifc-classification-for-a-reducing-coupling/5963 "2025-03-11T15:40:31Z")
The IfcPipeFittingTypeEnum gives us the value CONNECTOR to classify a coupling used to join two pipe segments. However, if I have a reducing coupling made of the same material (PVC), should it still be classified as a CO… --- ## [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? --- ## [Best classification for an assembly](https://forums.buildingsmart.org/t/best-classification-for-an-assembly/5919)
**Author:** [@namio.sousa](https://forums.buildingsmart.org/u/namio.sousa)\ **Replies:** 2\ **Last updated:** [February 11, 2025, 9:54pm UTC](https://forums.buildingsmart.org/t/best-classification-for-an-assembly/5919 "2025-02-11T21:54:45Z")
I have an assembly consisting of a garbage disposal and a P‐trap. I would like to convert this assembly into a single element. Can I classify the entire assembly as an IfcElementAssembly of type ACCESSORY\_ASSEMBLY? --- ## [Exporting bridge elements to IFC 4.3: IfcBridge or IfcRoad?](https://forums.buildingsmart.org/t/exporting-bridge-elements-to-ifc-4-3-ifcbridge-or-ifcroad/5811)
**Author:** [@dmkorchemnyi](https://forums.buildingsmart.org/u/dmkorchemnyi)\ **Replies:** 2\ **Last updated:** [December 19, 2024, 11:21pm UTC](https://forums.buildingsmart.org/t/exporting-bridge-elements-to-ifc-4-3-ifcbridge-or-ifcroad/5811 "2024-12-19T23:21:31Z")
Dear Colleagues, I’m currently working on exporting a bridge model to IFC 4.3 and need some guidance regarding the placement of elements on the bridge deck. There seem to be two ways to do this, and I’m not sure which o… --- ## [Example IfcBuildingStorey decomposed in parts](https://forums.buildingsmart.org/t/example-ifcbuildingstorey-decomposed-in-parts/5793)
**Author:** [@Teun](https://forums.buildingsmart.org/u/Teun)\ **Replies:** 0\ **Last updated:** [December 9, 2024, 10:17am UTC](https://forums.buildingsmart.org/t/example-ifcbuildingstorey-decomposed-in-parts/5793 "2024-12-09T10:17:04Z")
In our project there are several levels that are almost but not completely the same. We have 4 BuildingStorey which can be the first floor and 4 which can be the second floor. (I know) In the documentation I read that a… --- ## [IfcAsset and IfcInventory SW implementation](https://forums.buildingsmart.org/t/ifcasset-and-ifcinventory-sw-implementation/3440)
**Author:** [@daviddelven](https://forums.buildingsmart.org/u/daviddelven)\ **Replies:** 5\ **Last updated:** [December 2, 2024, 9:52pm UTC](https://forums.buildingsmart.org/t/ifcasset-and-ifcinventory-sw-implementation/3440 "2024-12-02T21:52:26Z")
Hello to everybody, Does someone know about some SW implementation enabling the mapping or creation of the following IfcGroup subtypes: IfcAsset IfcInventory Thanks in advance David --- ## [IfcConstructionProductResource limitation use case in Cost Norms/ Resource Built-up](https://forums.buildingsmart.org/t/ifcconstructionproductresource-limitation-use-case-in-cost-norms-resource-built-up/5754)
**Author:** [@Dimitrios](https://forums.buildingsmart.org/u/Dimitrios)\ **Replies:** 0\ **Last updated:** [November 11, 2024, 10:18pm UTC](https://forums.buildingsmart.org/t/ifcconstructionproductresource-limitation-use-case-in-cost-norms-resource-built-up/5754 "2024-11-11T22:18:57Z")
I have posted a detailed issue in the Git Repo IfcConstructionProductResource limitation use case in Cost Norms/ Resource Built-up · Issue #911 · buildingSMART/IFC4.3.x-development · GitHub with respect to a recent modif… --- ## [What ever happened to Anootation related classes](https://forums.buildingsmart.org/t/what-ever-happened-to-anootation-related-classes/5620)
**Author:** [@adishavit](https://forums.buildingsmart.org/u/adishavit)\ **Replies:** 7\ **Last updated:** [September 1, 2024, 1:29pm UTC](https://forums.buildingsmart.org/t/what-ever-happened-to-anootation-related-classes/5620 "2024-09-01T13:29:50Z")
Hi, When trying to represent architectural drawings, I was going over the IFC docs. In Ifc 2x3 there were various classes like: IfcDimensionCurve, IfcDraughtingCallout, IfcLinearDimension, IfcDimensionPair etc. Where … --- ## [RelatedBuildElement](https://forums.buildingsmart.org/t/relatedbuildelement/5506)
**Author:** [@AmyCimerman](https://forums.buildingsmart.org/u/AmyCimerman)\ **Replies:** 1\ **Last updated:** [July 8, 2024, 7:29am UTC](https://forums.buildingsmart.org/t/relatedbuildelement/5506 "2024-07-08T07:29:01Z")
Hello there! I am working in Revit and trying to export this later to IFC: In my model, I already created 2 categories “boundary type” (physical / virtual) and "boundary location (external / Internal). Now I have assig… --- ## [Can an IFC STEP file contain entities that are not in a direct or indirect relationship with the spatial structure?](https://forums.buildingsmart.org/t/can-an-ifc-step-file-contain-entities-that-are-not-in-a-direct-or-indirect-relationship-with-the-spatial-structure/5418)
**Author:** [@marw](https://forums.buildingsmart.org/u/marw)\ **Replies:** 15\ **Last updated:** [June 29, 2024, 1:51pm UTC](https://forums.buildingsmart.org/t/can-an-ifc-step-file-contain-entities-that-are-not-in-a-direct-or-indirect-relationship-with-the-spatial-structure/5418 "2024-06-29T13:51:10Z")
A scientific article was just released, with the title: “Cypher4BIM: Releasing the Power of Graph for Building Knowledge Discovery” (I am not allowed to share the link in this forum) This article gives some examples o… --- ## [IFC 4x3 texture can not be displayed](https://forums.buildingsmart.org/t/ifc-4x3-texture-can-not-be-displayed/5453)
**Author:** [@longt61](https://forums.buildingsmart.org/u/longt61)\ **Replies:** 0\ **Last updated:** [June 21, 2024, 10:42am UTC](https://forums.buildingsmart.org/t/ifc-4x3-texture-can-not-be-displayed/5453 "2024-06-21T10:42:11Z")
I try to create an 4x3 IFC file with texture, even though the file passes most of the validation from Building Smart, the texture can not be displayed. The only error I got is that I have incorrect decomposition of elem… --- ## [IFC Format web section on Tehcnical Website](https://forums.buildingsmart.org/t/ifc-format-web-section-on-tehcnical-website/5410)
**Author:** [@daviddelven](https://forums.buildingsmart.org/u/daviddelven)\ **Replies:** 3\ **Last updated:** [June 4, 2024, 10:00am UTC](https://forums.buildingsmart.org/t/ifc-format-web-section-on-tehcnical-website/5410 "2024-06-04T10:00:16Z")
Where is the IFC Format section, always under the Standards section on the Technical Website? I can retrieve it using a stored URL or as a hyperlink on the main IFC section. --- ## [Querry the whole list of IFC classes to bSDD for IDS writing](https://forums.buildingsmart.org/t/querry-the-whole-list-of-ifc-classes-to-bsdd-for-ids-writing/5395)
**Author:** [@Enrra](https://forums.buildingsmart.org/u/Enrra)\ **Replies:** 6\ **Last updated:** [May 23, 2024, 3:51pm UTC](https://forums.buildingsmart.org/t/querry-the-whole-list-of-ifc-classes-to-bsdd-for-ids-writing/5395 "2024-05-23T15:51:10Z")
Hello, I want to have a small filter allowing people to select the correct classes proposed in the IFC Schema. I want to use bSDD in order to not having to downloadI FC Schema, making the application more logical. The p… --- ## [IFC Model: North Orientation](https://forums.buildingsmart.org/t/ifc-model-north-orientation/5380)
**Author:** [@Gonzo](https://forums.buildingsmart.org/u/Gonzo)\ **Replies:** 2\ **Last updated:** [May 21, 2024, 12:51pm UTC](https://forums.buildingsmart.org/t/ifc-model-north-orientation/5380 "2024-05-21T12:51:25Z")
Hello everyone, I have a question regarding the orientation of the IFC model for a best practice OpenBIM coordination. Should the model be oriented to the true geographic north? I personally prefer to have the buildin… --- ## [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… --- ## [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… [Next page](https://forums.buildingsmart.org/tag/ifc/24.md?match_all_tags=true&page=1&tags%5B%5D=ifc)