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Handling the IfcProject in a big project

agroni
Contributor
Hi everyone,

i have a very specific question about IFC exchange in a bigger project. It is a case that chases me in my career and so far, did not seem to find the right answer.

The project has different levels for the ground floor (aprox. +1,5m) and we might need to model these two structures separately and connect them with modules. This is the easy part and can be done well in archicad by hotlink. My question concerns more the IFC Structure, since in this case we would be exporting two separate IFC Files, meaning two IfcProjects. These separate IFC Files have a defined IfcBuildingStorey and its appropriate heights, the IfcBuilding with the correct altitude level and the IfcSite (look @ IfcBuilding) . These Enteties can be repetitive in a single IFC Structure, as seen in the IfcBuilding (with Building[1] and Building[2]. But the IfcProject on the other hand must be a single unique entity in the structure which is defined by IfcSingleProjectInstance (look @ IfcProject). The above mentioned cases are based on IFC4. In IFC2x3 the description is not so ritch but I would assume it applies as to IFC4.x

So, when federating these two IFC Models in a CDE, I would get two IfcProjects that have different GUIDs, meaning they are not the same. Or is the Name attribute of IfcProject more important to define the common project here?
As far as I know, in Archicad it is not possible to have one single project and export a part of it in IfcBuilding[1] and another part in IfcBuilding[2].
Or would you simply try to model the whole project in one file, ignoring the height difference and export a single IFC?
The BIMster @ AllesWirdGut
Currently: Archicad 24 & 22
User since Archicad 6.5 (2001)
1 ACCEPTED SOLUTION

Solution
Laszlo Nagy
Community Admin
Community Admin
Please watch this short clip, it may have the answer to what you are looking for:

....................................................................................................
Get Archicad Tips at https://twitter.com/laszlonagy
AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC26
Loving Archicad since 1995

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8 REPLIES 8

Solution
Laszlo Nagy
Community Admin
Community Admin
Please watch this short clip, it may have the answer to what you are looking for:

....................................................................................................
Get Archicad Tips at https://twitter.com/laszlonagy
AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC26
Loving Archicad since 1995

agroni
Contributor
Thanx Laszlo for your reply. You have hit the spot with your answer
Actually I am a bit ashamed, that this this was already made possible in AC19. Nonetheless, I need to check our office template if we did not loose these parameters on the way up to 22
The BIMster @ AllesWirdGut
Currently: Archicad 24 & 22
User since Archicad 6.5 (2001)

agroni
Contributor
Hi Laszlo.....again

sorry to bother you again with this case, but for some reason I am not able to get the models into one structure as it is shown in the video. In the video it is clear how it is done, but when exporting an IFC from AC22, the GUIDs are the same for IfcProject and IfcSite, whereas the IfcBuilding differs, but Solibri does not check this thing. Also tried it in BIMcollabZoom and same results.

Is something going wrong with the export?
The BIMster @ AllesWirdGut
Currently: Archicad 24 & 22
User since Archicad 6.5 (2001)

Laszlo Nagy
Community Admin
Community Admin
I have not checked it myself, but if you fill out all those field as shown in the clip, it should work. If it does not work, then there may be a bug somewhere.
....................................................................................................
Get Archicad Tips at https://twitter.com/laszlonagy
AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC26
Loving Archicad since 1995

agroni
Contributor
I have information from my sources
Apparently there are some seconds missing in this video. In those missing sequences the user merges all IFCs in Archicad and then does an IFC Export.
This would make then sense in Solibri, why there is only one IfcProject and the structure develops.

I have tried many ways to see in Solibri just one structure. On the other hand, I believe that Solibri is not design to simulate a CDE where you would probably see this single structure of the project.

So, the case is half closed
The BIMster @ AllesWirdGut
Currently: Archicad 24 & 22
User since Archicad 6.5 (2001)

Laszlo Nagy
Community Admin
Community Admin
The video at around the 3 minute mark says that you export an IFC file from all three ARCHICAD project files separately, and then you use an application that is capable of merging multiple IFC files into a single IFC File. Then you can open the resulting single IFC file in Solibri or other IFC viewer application.
....................................................................................................
Get Archicad Tips at https://twitter.com/laszlonagy
AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC26
Loving Archicad since 1995

Hi Guys,

And what about GUIDs in each of the model, after importing them into Center File? If they will change, it is hard to actually do clash detection.

Cheers,
Karol
OPENBIM does works!
ArchiCAD 22/23/24/25/26
AMD Ryzen 7 3700X, 32GB RAM, GeForce RTX 2070, Windows 11 Pro
MBP 14 M1 Max 32GB
http://www.bimfaktoria.pl/

Laszlo Nagy
Community Admin
Community Admin
Did you see a change in GUID?
You can also use the IFC GUID, which I think will stay the same even after the IFC files are merged (federated) into a single IFC file.

So, just to clarify: you do not merge the ARCHICAD files into a single ARCHICAD file and then export as IFC.
You Export as IFC from each individual ARCHICAD Project, then you use a 3rd party software to merge the 3 resulting IFC files into a single IFC file (you federate the models). There are various applications on the market that can do that.
....................................................................................................
Get Archicad Tips at https://twitter.com/laszlonagy
AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC26
Loving Archicad since 1995

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