# Latest **URL:** https://forums.buildingsmart.org/latest.md?page=2 [Latest](https://forums.buildingsmart.org/latest.md) · [Categories](https://forums.buildingsmart.org/categories.md) · [Tags](https://forums.buildingsmart.org/tags.md) **Page:** 3 --- ## [IfcFaceBasedSurfaceModel documentation](https://forums.buildingsmart.org/t/ifcfacebasedsurfacemodel-documentation/6137)
**Author:** [@SJL](https://forums.buildingsmart.org/u/SJL)\ **Replies:** 1\ **Last updated:** [June 2, 2025, 7:11am UTC](https://forums.buildingsmart.org/t/ifcfacebasedsurfacemodel-documentation/6137 "2025-06-02T07:11:39Z")
In documentation it says “IFC4-CHANGE The entity has been deprecated and shall not be used. The entity IfcFacetedBrep shall be used instead.” However FacetedBrep is a solid model. IfcFaceBasedSurfaceModel is not (necess… --- ## [Official Model View Definitions for IFC 4.3](https://forums.buildingsmart.org/t/official-model-view-definitions-for-ifc-4-3/5737)
**Author:** [@schilu](https://forums.buildingsmart.org/u/schilu)\ **Replies:** 6\ **Last updated:** [June 2, 2025, 6:01am UTC](https://forums.buildingsmart.org/t/official-model-view-definitions-for-ifc-4-3/5737 "2025-06-02T06:01:17Z")
Hi, Where can I find the definitions of the official Model View Definitions (Reference View, Alignment Based Reference View, Design Transfer View) for IFC 4.3? There is no direct link in the IFC documentation. Also, th… --- ## [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 5 and API](https://forums.buildingsmart.org/t/ifc-5-and-api/6102)
**Author:** [@RenzoVenuti](https://forums.buildingsmart.org/u/RenzoVenuti)\ **Replies:** 1\ **Last updated:** [May 13, 2025, 10:33am UTC](https://forums.buildingsmart.org/t/ifc-5-and-api/6102 "2025-05-13T10:33:32Z")
Is it buildingsmart’s intention to make available an API to read and write the new IFC 5 format? --- ## [Reinforced Concrete in IFC4.3.2.0 AbV](https://forums.buildingsmart.org/t/reinforced-concrete-in-ifc4-3-2-0-abv/6095)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 2\ **Last updated:** [May 8, 2025, 7:01am UTC](https://forums.buildingsmart.org/t/reinforced-concrete-in-ifc4-3-2-0-abv/6095 "2025-05-08T07:01:50Z")
Don’t we have a consensus and definition (within the AbV and RV) of how steel reinforcing for concrete relates to the concrete elements it is reinforcing? Which IfcRel is to be used? Is the reinforcing meant to aggregate… --- ## [Qset for basic quantities: Qset\_QuantityTakeOff ?](https://forums.buildingsmart.org/t/qset-for-basic-quantities-qset-quantitytakeoff/6019)
**Author:** [@ejs](https://forums.buildingsmart.org/u/ejs)\ **Replies:** 1\ **Last updated:** [April 27, 2025, 8:27am UTC](https://forums.buildingsmart.org/t/qset-for-basic-quantities-qset-quantitytakeoff/6019 "2025-04-27T08:27:01Z")
Hi All, I need to aggregate basic quantities for an element into some defined structure. Theres was a promising ‘Pset\_QuantityTakeOff’ in the IFC2x3, but it vanished away. For ‘basic quantities’ I mean Height, Length, … --- ## [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… --- ## [Clarifying the Role of IFC STEP (SPF) in IFC5 and Its Relationship with Modern Formats like JSON](https://forums.buildingsmart.org/t/clarifying-the-role-of-ifc-step-spf-in-ifc5-and-its-relationship-with-modern-formats-like-json/6046)
**Author:** [@shihangzhang](https://forums.buildingsmart.org/u/shihangzhang)\ **Replies:** 1\ **Last updated:** [April 2, 2025, 12:16pm UTC](https://forums.buildingsmart.org/t/clarifying-the-role-of-ifc-step-spf-in-ifc5-and-its-relationship-with-modern-formats-like-json/6046 "2025-04-02T12:16:16Z")
Continued Relevance of STEP (SPF): Will STEP (SPF) remain the primary format for IFC5 compliance, particularly for regulatory submissions or archival purposes? Are there scenarios where STEP is mandatory versus option… --- ## [Suggested approach for modelling a blockwork quay wall](https://forums.buildingsmart.org/t/suggested-approach-for-modelling-a-blockwork-quay-wall/6045)
**Author:** [@DanPeel](https://forums.buildingsmart.org/u/DanPeel)\ **Replies:** 1\ **Last updated:** [March 31, 2025, 12:50pm UTC](https://forums.buildingsmart.org/t/suggested-approach-for-modelling-a-blockwork-quay-wall/6045 "2025-03-31T12:50:25Z")
I am delivering a shipyard project in ifc 4.3 where we have several blockwork type quay walls. These walls are constructed from pre-cast concrete blocks each weighing around 70 tonnes. Each block is treated as its own en… --- ## [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… --- ## [IFC for Tunnel](https://forums.buildingsmart.org/t/ifc-for-tunnel/6031)
**Author:** [@RenzoVenuti](https://forums.buildingsmart.org/u/RenzoVenuti)\ **Replies:** 1\ **Last updated:** [March 24, 2025, 8:26am UTC](https://forums.buildingsmart.org/t/ifc-for-tunnel/6031 "2025-03-24T08:26:47Z")
Will ifcTunnel be in ifc version 4.4? --- ## [How to validate IDS files?](https://forums.buildingsmart.org/t/how-to-validate-ids-files/5993)
**Author:** [@AntonioCWD](https://forums.buildingsmart.org/u/AntonioCWD)\ **Replies:** 6\ **Last updated:** [March 13, 2025, 4:44pm UTC](https://forums.buildingsmart.org/t/how-to-validate-ids-files/5993 "2025-03-13T16:44:43Z")
In order to properly use IDS files to validate IFC files, we should make sure, that IDS files are properly formatted. Just yesterday I heard from someone using IDS since its beginning, that different vendors produce IDS… --- ## [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… --- ## [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… --- ## [Software for creating bSDD JSON](https://forums.buildingsmart.org/t/software-for-creating-bsdd-json/5976)
**Author:** [@cmellueh](https://forums.buildingsmart.org/u/cmellueh)\ **Replies:** 4\ **Last updated:** [February 28, 2025, 10:13am UTC](https://forums.buildingsmart.org/t/software-for-creating-bsdd-json/5976 "2025-02-28T10:13:08Z")
Hi, i want to create a bSDD to communicate our object/attribute requirements better with our partners. Is there a software with a GUI that is made for creating bSDD json files so i can import them into the manage.bsdd p… --- ## [IfcSpatialZone and Graphisoft's IFC4 Architectural Reference Exchange EXPORT certification](https://forums.buildingsmart.org/t/ifcspatialzone-and-graphisofts-ifc4-architectural-reference-exchange-export-certification/3103)
**Author:** [@daviddelven](https://forums.buildingsmart.org/u/daviddelven)\ **Replies:** 5\ **Last updated:** [February 25, 2025, 3:10pm UTC](https://forums.buildingsmart.org/t/ifcspatialzone-and-graphisofts-ifc4-architectural-reference-exchange-export-certification/3103 "2025-02-25T15:10:26Z")
Hello everybody. On one hand, since Graphisoft Archicad already finally got (in 2019) the IFC4 Architectural Reference Exchange EXPORT buildingSMART certification, and on the other hand, IFC4 Schema already introduced t… --- ## [IFC4.3.2.0 Chapter 4 documentation error? - 4.1.2.4 Documentation Association](https://forums.buildingsmart.org/t/ifc4-3-2-0-chapter-4-documentation-error-4-1-2-4-documentation-association/5955)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 0\ **Last updated:** [February 20, 2025, 3:54pm UTC](https://forums.buildingsmart.org/t/ifc4-3-2-0-chapter-4-documentation-error-4-1-2-4-documentation-association/5955 "2025-02-20T15:54:22Z")
Currently, “4 Fundamental concepts and assumptions” does NOT indicate that “4.1.2.4 Document Association” is within scope of either base MVD, BUT the individual entries for IfcDocumentReference and IfcDocumentInformation… --- ## [Contradictory rules for Pset prefix usage](https://forums.buildingsmart.org/t/contradictory-rules-for-pset-prefix-usage/5949)
**Author:** [@AntonioCWD](https://forums.buildingsmart.org/u/AntonioCWD)\ **Replies:** 3\ **Last updated:** [February 20, 2025, 2:23pm UTC](https://forums.buildingsmart.org/t/contradictory-rules-for-pset-prefix-usage/5949 "2025-02-20T14:23:21Z")
According to the buildingSMART documentation on IfcPropertySet for IFC 2x3 In addition any user defined property set can be captured, those property sets shall have a Name value not including the “Pset\_” prefix. The … --- ## [Contradictory rules for Name field (Entity Rule - IfcBuildingElementProxy.WR1)](https://forums.buildingsmart.org/t/contradictory-rules-for-name-field-entity-rule-ifcbuildingelementproxy-wr1/5951)
**Author:** [@AntonioCWD](https://forums.buildingsmart.org/u/AntonioCWD)\ **Replies:** 2\ **Last updated:** [February 20, 2025, 2:02pm UTC](https://forums.buildingsmart.org/t/contradictory-rules-for-name-field-entity-rule-ifcbuildingelementproxy-wr1/5951 "2025-02-20T14:02:11Z")
According to the validator the following line is violating a rule, where the name field has to exist(/be populated): #325286= IFCBUILDINGELEMENTPROXY(‘1kZKrDa5XBteRTcTyfP8Jx’,#11,$,$,‘F A L S C H’,#133475,$,‘F A L S C H… --- ## [Status of IfcPileConstruction](https://forums.buildingsmart.org/t/status-of-ifcpileconstruction/5911)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 15\ **Last updated:** [February 12, 2025, 9:14am UTC](https://forums.buildingsmart.org/t/status-of-ifcpileconstruction/5911 "2025-02-12T09:14:54Z")
In the current online specification for IfcPile, IfcPile.ConstructionType is “informally” listed as deprecated, but IfcPileConstructionEnum itself is NOT indicated as deprecated. Is this an error either way? While the … --- ## [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? --- ## [Presenting Blender as a new IFC authoring tool](https://forums.buildingsmart.org/t/presenting-blender-as-a-new-ifc-authoring-tool/1791)
**Author:** [@Moult](https://forums.buildingsmart.org/u/Moult)\ **Replies:** 157\ **Last updated:** [February 9, 2025, 6:08am UTC](https://forums.buildingsmart.org/t/presenting-blender-as-a-new-ifc-authoring-tool/1791 "2025-02-09T06:08:05Z")
I’d like to present Blender, the heavyweight 3D CG suite, to be used as a free and open-source BIM authoring tool to add to suite of tools out there. It is part of IfcOpenShell and developed here: It is relatively bra… --- ## [IfcRelSpaceBoundary](https://forums.buildingsmart.org/t/ifcrelspaceboundary/2709)
**Author:** [@ArnoMarechal](https://forums.buildingsmart.org/u/ArnoMarechal)\ **Replies:** 17\ **Last updated:** [February 8, 2025, 11:14pm UTC](https://forums.buildingsmart.org/t/ifcrelspaceboundary/2709 "2025-02-08T23:14:23Z")
Is it possible when using the relation IfcRelSpaceBoundary (2nd boundary) to know the linked spaces. eg see figure with the wall in the middle and spaces A,B,C and D: Is it possible to determine from IFC that space (A,… --- ## [IFC class for garbage disposal](https://forums.buildingsmart.org/t/ifc-class-for-garbage-disposal/5917)
**Author:** [@namio.sousa](https://forums.buildingsmart.org/u/namio.sousa)\ **Replies:** 0\ **Last updated:** [February 2, 2025, 3:07pm UTC](https://forums.buildingsmart.org/t/ifc-class-for-garbage-disposal/5917 "2025-02-02T15:07:48Z")
Whats the best ifc type for a garbage disposal, installed under a sink? --- ## [Field bent rebar](https://forums.buildingsmart.org/t/field-bent-rebar/5870)
**Author:** [@Rick\_Brice](https://forums.buildingsmart.org/u/Rick_Brice)\ **Replies:** 7\ **Last updated:** [January 31, 2025, 5:17pm UTC](https://forums.buildingsmart.org/t/field-bent-rebar/5870 "2025-01-31T17:17:45Z")
How can field bent rebar be modeled with IFC? The particular case I’m thinking of is a precast, prestressed concrete bridge girder where the stirrups project vertically out of the top flange. At the bridge site, these b… --- ## [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… --- ## [IFC Delta/Partial Updates](https://forums.buildingsmart.org/t/ifc-delta-partial-updates/4427)
**Author:** [@gschleusner](https://forums.buildingsmart.org/u/gschleusner)\ **Replies:** 3\ **Last updated:** [January 2, 2025, 12:43pm UTC](https://forums.buildingsmart.org/t/ifc-delta-partial-updates/4427 "2025-01-02T12:43:54Z")
Hi All, At the last General Assembly Meeting it was agree that we look at Partial File Exchange to support sending updates vs full files. At least major vendors have the infrastructure to support this directly on Exp… --- ## [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 … --- ## [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… [Previous page](https://forums.buildingsmart.org/latest.md?page=1) [Next page](https://forums.buildingsmart.org/latest.md?page=3)