Problems with imported IFC from Archicad

[antonio.mogorovic]

Hello.

We have a project that we are working on and are collaborating with architects that are doing architecture in Archicad. Model is georeferenced. When I import IFC that they've given me, model phisically goes into real world coordinates. But for some reason levels that are being used for modeling in archicad are not showing distance from elevation point from survey point (theirs) instead they are being shown as distance from 0 of coordinate system. How can I fix this problem? 

Regards

[ToanDN]

Sounds like Archicad problem at exporting IFC, no?  If they can't fix it, you can ignore the levels from the IFC link and create your own levels at the correct elevations. 

[antonio.mogorovic]

I dunno if it is really a problem with archicad export, because model goes where it is supposed to go. It is just that levels are tied to my zero in Revit. It seems like Levels in IFC are not tied to survey point elevation.

The only thing that I'm thinking of is to create indeed new levels in revit but elevations in section will not show correct number (like ground floor won't be on 0, it will be on 1.5 m i.e the offset amount. Maybe I can correct that later with throwing project base point at the corner and on the ground. But as there are others that are collaborators and manual leveling, it may be the critical place to fail and then suffer consequences for that.

[ToanDN]

Revit doesn't add levels to the IFC so yes, if Archicad generate levels at wrong elevations in the IFC then it is its problem.  You can ask if they have any export settings that can correct it. 

As far as the Elevation of new levels you may need to add in Revit, you can set them to use either Survey point or Project base point as the Elevation base.  If the IfC is georeferenced then set by Survey point should give you real elevations.  If not, you can change project base point Elevation to get what you want.

[L.Maas]

You should check with the company who does the project coordination. If you all send IFCs (or projectfiles) to them and they combine them into overall project file they should be able to tell if the issue is on your end or on one of the other parties.

For larger project we normally get instruction how and where it should be positioned and sometimes receive project file (Revit) with basepoints, grids and levels to check or set up our project file. Definitely something you want to coordinate at start of project.

[lim.wendy]

Hi @antonio.mogorovic,

Welcome to the Revit forum. Thanks for reaching out to the forum. Were you able to figure out what causes the problems with imported IFC from Archicad?

Let us know if you require further help.

[antonio.mogorovic · Accepted solution]

What I did is basically opened empty Revit file, OPENED IFC in it. Got PBP positioned at theirs project zero, SP on their SP location, even got their project north exactly the same. Then I closed it , and used link Revit where I also aquired coordinates from that file. Sometimes it is bummer because when using File/Open... some elements may be missing so to be 100 percent sure one can additionally with link IFC manually allign with that one just to be sure nothing is missing.

This was the best thing that suited the needs. Got leveles like it should, it kept their orientation..  Because everything must go in place when opening in construction cloud.

It is a bit tricky when working with more buildings and all needs to be georeferenced.

[lim.wendy]

Thanks for sharing @antonio.mogorovic. I've marked your response as the "Solution". 

Remember to mark your posts as having an "Accepted Solution" if a solution is found as it helps other forum users with the same issue – so don't be shy about marking it as a solution! Accepted solutions get viewed more and help more users find the answer to their problems.