topic Re: IFC export altitude in Collaboration with other software

IFC export altitude

CosminF — Fri, 28 Feb 2025 15:36:33 GMT

Hi,

I am having issues exporting an IFC file that can correctly overlap with another IFC file (made in Revit) on a 3rd party platform (Trimble Connect).

Basically, my model is offset on the Z axis by the value of the altitude (rougly 300m).

I have tried:
- Resetting the altitude to 0 in Archicad
- defining the survey elevation to 0 and, afterwards, the correct sea level height
- trying to input the sea level height into the georeferencing parameter for ifc
- messing around with the IFC translator with all 3 variants for geometry conversion (Project origin only, survey only, both)
- read the IFC reference guide from the Learn portal.

I have still made 0 progress, the file still appears "under" the revit generated ones by the exact value of the sea level elevation..

And unfortunately, I am the only one using Archicad so asking everybody else to accomodate for my needs is not really on the table (altough I have asked a collaborator to export differently (without the sea level value - Project Base Point in Revit) and it overlapped perfectly instantly with my model.

Visual representation of my issues:

Any ideas?

Operating system used: Windows

Re: IFC export altitude

Ricardo Lopez — Fri, 28 Feb 2025 14:34:21 GMT

Hi @CosminF

Try setting up the Z elevation value for your Archicad Survey Point to -300m.

Re: IFC export altitude

CosminF — Fri, 28 Feb 2025 15:37:51 GMT

Hi Ricardo,

Thank you for the reply!

Unfortunately, that also did not work..
Survey screenshots:

and the Trimble connect overlap has the same issue:

Re: IFC export altitude

Ricardo Lopez — Fri, 28 Feb 2025 15:38:25 GMT

Hi @CosminF

Anyway (this is not an Archicad solution), as far as I know I think it is possible to adjust the IFC model location in Trimble Connect.

Re: IFC export altitude

CosminF — Fri, 28 Feb 2025 21:13:12 GMT

That is actually a great workaround - at least for my purposes currently!

Thank you!