https://standards.buildingsmart.org/documents/Implementation/IFC_Implementation_Agreements/ Is it safe to say that every CV is either directly implemented in IFC4+ or it is implied that CV holds true for every IFC schema version? Should CV’s be updates for newer schemas?

This has been proposed 3 months ago, but either no action has been taken, or that action is behind closed doors: https://github.com/buildingSMART/NextGen-IFC/issues/42 I find it odd that buildingSMART decides to lock these issues instead of letting the community continue to address them. There is n…

There was an attempt several years ago to go through every single IFC2x3 CV and decide if it was still relevant or not. The general consensus was that IFC4 should generally have no CVs, and that everything should be included as part of the base documentation. I don’t know where that suggestion sta…

@angel.velez I’ve heard that too as that was the theory. In practice, however, some CVs are still used to resolve ambiguous behaviour (e.g. the whole material / surface colour issue)

Exactly, yeah. Colors issue is definitely a hot topic. A couple of CVs we were wondering about are about Doors and Windows. https://standards.buildingsmart.org/documents/Implementation/IFC_Implementation_Agreements/CV-2x3-178.html https://standards.buildingsmart.org/documents/Implementation/IFC_I…

Just to clarify my understanding of the terminology: “CV” stands for “Coordination view” which is an IFC2x3 MVD, “CV” does not mean “Implementer’s agreement”. The naming of the agreements is based on the fact that implementer’s agreements used to be valid only in the context of an MVD and specific i…

@tauscher You are correct. Every IA identifies how it is applied, usually to a specific MVD. @claimred and @moult The truth is, both the IFC2x3 certification and IFC4 developments were happening in parallel, with some IAs not occurring until well after things had been locked down in the IFC4 develo…

@jwouellette cheers - so to prevent the same mistakes in IFC5 - what is the avenue to resolve these IAs one by one? The Github issue I linked to has been locked, so I’m not sure where to further the discussion, and if any progress has been made.

Every IA identifies how it is applied, usually to a specific MVD. @jwouellette @tauscher Thanks for the answers! I think I got a bit confused because IFC4 IAs are still named CV-4-* though while there is no Coordination View for IFC4+ schemas. Could you please clarify my question about parametri…

Another IA I was wondering about is this: CV-2x3-178 In this cases with IfcRelConnectsElements it is possible to represent this relation without losing information. The IfcRelConnectsElements.RelatingElement then points to the building element, such as IfcWall , whereas the IfcRelConnectsEle…

[image] claimred: Should IFC4 RV MVD support parametric Doors & Windows or should they have explicit shape representation and ParameterTakesPrecedence be deprecated? I agree with you that it seems not appropriate to use or allow this option in the RV MVD. This is, however, not the same as dep…

IFC 2x3 implementation agreements status in IFC4+

Developers

claimred August 7, 2020, 11:14am 14

Speaking of moving forward, I think it would be neat to mention current IAs about colors in the colors discussion happening right now.

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IFC 2x3 implementation agreements status in IFC4+

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