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Material thickness ifc

Ieva
Participant

Hello,

 

I have a problem exporting material thickness to ifc. The filter is okay - other models are exporting correctly with it, but one of the models export materials without any thickness (I can see materials, but their thickness is 0). Can't find what's wrong. Do you have any ideas how to export them? or any clue what's wrong with the model?

I also get this error when exporting (you can see it in attached file)

4 REPLIES 4

Laszlo Nagy
Community Admin
Community Admin

So you are saying that a Building Material has a non-zero thickness in the model (in a Composite perhaps) and in the exported IFC its thickness becomes zero? Can you show screenshots of the structure in Archicad and the IFC file and its settings in Archicad?

About the error message:

maybe you have Building Materials which have their "Partificated in Collision Detection" checkbox unchecked?

BM_CollisionDetection.png

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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-AC25
Loving Archicad since 1995

Hi, Laszlo,

I'll add a bit to Ieva's inquiry: checkbox is checked in all materials, so I guess this should not be a problem. The problem seems to be with IfcCovering (Ceiling, Cladding, Flooring) - it exports the Material tab, but the thickness is still 0mm, where IfcWall is exported normally. I'm adding a couple of printscreens below.


Thank you in advance!

Laszlo Nagy
Community Admin
Community Admin

OK, I see, so the geometry is actually correctly exported to IFC (the element has thickness), but the thickness Properties report 0 mm for thickness for some reason.

I would say that this is a bug so I will report this to Graphisoft for investigation.

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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-AC25
Loving Archicad since 1995

Minh Nguyen
Graphisoft Moderator
Graphisoft Moderator

Dear All,

 

Thank you very much for sharing this problem! We have consulted it with our developers and it turned out to be a limitation of the IFC Schema and Solibri:

 

The parametric composite structure can only be preserved in IFC for IfcWall and IfcSlab via IfcMaterialLayerSetUsage. Solibri shows the thickness value from that, if it's present, otherwise it shows 0.
So this is a bug of Solibri (showing 0) and a limitation of the IFC schema (disallowing this structure for other types).

I hope this explains the situation. Please let me know if you have any further questions!

Best regards,

Minh

Minh Nguyen
Technical Support Engineer
GRAPHISOFT

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