IFC options class mapping - works with opening IFC but nut with linking?

[shundt1]

Hello everybody,

we got a new project and at the moment we give the openBIM with ifc another try. I think I'm constantly understanding more and more about IFC and Revit. But right now I'm faced with a situation I don't understand and I hope you can help me.

Here is the situation:

I want to exclude some of the ifc-classes while linking the ifc-file from the architect. So I opened the IFC-mapping table and there I got to the IFC-class named "IfcOpeningElement". As I remembered I entered "DontImport" in the column "revit category". Here the screenshot:

So far so good. Now there is this problem:

If I open the IFC-file directly in Revit it works - so the opening elements were not included in the model. Here the example:

But I want to link the ifc-file within my MEP-project so I can change the ifc-file if there are any updates regarding the architecture. So I linked this ifc-file and now the opening-elements will be in this file.

So my question is:

Is it possible to exclude IFC-classes while linking IFC-files in Revit?

Kind regards

[fabiosato]

Hello,

For more control, I always open the IFC and save as RVT file, I had the same issues in the past and I avoid them with this workflow.

I don´t know a way to do that with linking, unfortunatelly.

[shundt1]

Hey @fabiosato 

thank you for the idea. So you open the ifc-file, then save as a rvt-file and after that you link the rvt-file? I thought about this workaround, too. But in this case (i hope i remember that correctly) we're facing a problem when the architect updates the architecture, because the ID's of the elements will not stay the same in this case. And that's the problem for us: we need the ID's to stay the same for the calculation of heating/cooling load for example. Our calculation software doesn't identify the elements correctly with this workaround after the architecture gets updated. 

[fabiosato]

Hello,

In my case, IDs are not an issue, in this case, maybe editing the RVT file created when you link the IFC maybe an option.

[shundt1]

Hey @fabiosato 

this workaround could be fine. But it is very time consuming. The architect generally changes some architectural things in the project. So I would need to look after every change in the original IFC and then I would have to make the changes in the firstly imported RVT-file on my own. There is a big risk that we don't see every change in the model or forget some changes besides the part that it is very time consuming. So this is not a solution for us. We would rather live with wrong class mapping at the moment due to the timelines.

But thanks for your ideas. 

[fabiosato]

Hello,

Removing the openings is quite simple and can be done quickly, if the file is not too big.

But  if you receive a new model frequently it maybe time consuming.