IFC Export Issue - Revit 2021

[baris]

Hi,

There is an issue with IFC export.

When I try to export IFC file with the option "Export user-defined property set" enabled, 2021 does not even try to export IFC, whereas in 2020, the same file, same options, exports successfully.

[Adrian.kearns]

@angel_velez 

Hi Angel, 

Just following up on this and wondering whether you had any success in getting the IFC export to work correctly. 

Any feedback / advice would be greatly appreciated. 

Thanks.

[wawan.solihinYJE86]

May I know which version of the IFC Exporter you are using? and are you exporting for IFC2x3 or IFC4?

[Adrian.kearns]

I've been using IFC Exporter 2021 (v. 21.2.0.0) 

I've also downloaded the IFC 2020 IFC exporter and used the DLL file as per Angel previous recommendations. 

I'm exporting IFC2x3.

Thanks.

[wawan.solihinYJE86]

OK, now that I see the context what you are trying to do. This approach won't work simply because of 2 things:

1. IfcProject (which information partially comes from Project Information) is neither subtype of IfcElement nor IfcElementType and therefore the User Defined Pset definition will not apply to IfcProject

2. Parameters attached to the Project Information are not exported anywhere to IFC except for a few pre-defined ones.

For Address information to be exported, you can actually use the export setting (Address Information) dialog. But this only addresses the Project Address that will be attached to IfcSite or IfcBuilding.

In IFC4 export, you may do the following using IfcGeographicElement to represent the Site and attached with the user-defined propertyset as you define:

1. Create the site geometry using Topography surface

2. Set IfcExportAs = IfcGeographicElement.TERRAIN

3. Override the container to site: IfcSpatialContainer = IFCSITE

4. Assign the properties (for Pset "Contact IFC Parameters") to the Topography

5. Export to IFC4 Reference View and set the user-defined propertyset definition to "IFC User Defined Parameter Mappings.txt"

I attached the modified revit file and the exported IFC4 file.

Unfortunately this will work in IFC4 only since IfcGeographicElement is only defined in IFC4. However if you wish to export the model in IFC2x3, you will get a similar result, except that the Topography will be exported as IfcBuildingElementProxy.

[Adrian.kearns]

Thanks so much for clearing that up for me. 

That helps a lot. It's very much appreciated. 

Would you know of any way that the Contact information (i.e. COBie.Contact) that is input using the BIM Interoperability Tools menu can be exported to IFC? 

Similarly, as you mention only certain Project Information parameters are exported to IFC. Is there any way to export the data information from Project information (i.e. COBie.Facility). The only way I have been able to achieve this is by exporting via Revit Property Sets (which is obviously not ideal and not the recommended way to do it)

In the IFC COBie 2.4 Design Deliverables Setup, two additional tabs for Company Info and Project Info are provided but they don't appear to work when fields are populated. Would you have any idea why this would be the case? 

Thanks again for your help. 

[m-de-lange]

We are having the exact same issue as Baris.

Currently we cannot export IFC psets in R2021.

We tried the lost DLL solution, but unfortunately unsuccesful.

Currently trying to copy the 2019 DLL into the R2021 directory, but i believe we have no chance of success there.

Has there been an update on this? Revit 2021.1 was not the solution either.

[wsolihin]

Let me try this. I haven't used the COBie export option for a while

[ChrisS]

Hi there, I am exporting without any user-defined property sets, just trying to export "only the view," and I am getting blanks...total blanks of 45mb size...but totally invisible in Navisworks.  Is there a major issue w/the .ifc engine in Revit 2021 and is there a fix?  If not, what is the workaround please?  What formats can Revit 2021 support for exporting, if not .ifc?

[angel_velez]

Hi Chris,

Revit IFC generally works. We'd have to see your file to try to diagnose your issue. Or does occur with all files?

Thanks,
Angel

[ChrisS]

Hello Angel,
Thank you for the note. We are currently looking into it, but our file is pretty big. I'll ask our IT person if it ok to link you to the file on BIM 360. Anyway, it took 3.5 hours to get half the model processed when it crashed yesterday, later attempts resulted in some .ifc files but they were blank, and neither Autocad nor Navisworks could read them.
This morning I printed a 3D .dwg in about 30 sec. at 80 MB and it opened in both Autocad and Navisworks perfectly so I sent that to our partners instead. I heard rumors that 2021 is not functioning well with .ifc and incidentally our Autocad 2021 doesn't even have an .ifc engine in its bundle, which is weird. Is that an aftermarket issue?
Cheers,
Chris

[angel_velez]

Hi Chris,
AutoCAD doesn't come with out of the box IFC support - AutoCAD Architecture and MEP do. In general, IFC support in 2021 is better than 2020, and it is better in 2022 than in 2021, but we will look at any issues you can send to us.
Regards,
Angel

[Anonymous]

I've just experienced this issue, tried all the works around explained here and none of them worked. My IFC file was empty everytime.

I manage to solve the problem following these steps: 
https://knowledge.autodesk.com/support/revit/troubleshooting/caas/sfdcarticles/sfdcarticles/Empty-IF...

It worked perfectly.

[chanmyaeaung.tumgy]

When Export to IFC , doesn't appear dialog box (IFC Modify box). Please help me.

[chanmyaeaung.tumgy]

When I export to IFC file, doesn't appear dialog box( Modify box) . And force close revit. please tell me .