I’ve read in the specification that I can have two geometric representation sub-contexts, one for 3d ‘body’ shapes and one for 2d ‘plan’ shapes. I’m creating a new IFC authoring tool, and I’ve tried to set this up and I’m struggling to get it to work using Revit as my desired viewer. I set up one …

There are a few issues with your IFC. Firstly, null values should be $, not left blank. New entities should be on new lines, not as shown on #93. At a glance I suspect Revit doesn’t parse the GeometricSet. Have you tried other representations? BlenderBIM allows free and open source authoring of IFC…

Thank you, Moult, I recognize your name – having seen a couple articles from your site previously. I should have uploaded my IFC file instead of pasting it in to the discussion window. I believe that when I pasted it in, the dollar signs were stripped out and the line breaks were messed up. I’ll at…

No worries, if you could attach your IFC file that would help debug. I think (could be wrong) that from the IFC side the file has already specified all that it can in terms of saying “this geometry is footprint in a plan view” and “this geometry is clearance” and “this geometry is body”. It sugges…

My file is really not too different from the file you attached except for the use of the ‘Plan’ IfcGeometricRepresentationContext under which the 2d shape’s sub-context is placed. I had tried that as well without much success. I will explore the possibility of using properties to hide/show elements …

As far as I am aware, those Revit checkboxes are not connected to IFC data. I was kind of referring to regular IFC psets, which you could then put a filter on. But upon thinking it through, the three shapes are merged into a single object in IFC, so it may be very hard to separate them. I am not aw…

I was able to accomplish separate representations in Revit’s model and plan view by using a second IfcGeometricRepresentationContext. I tried using a sub-context, but I couldn’t get it to work in Revit 2020. Below is an excerpt of a door that is an extruded solid in model view and just header lines …

Yes, except doors are usually more than 0.00001 feet high :slight_smile: What you’ve done doesn’t sound like separate representations in model and plan view, it sounds like you’ve just made the body representation unnoticable.

I meant to say that I used a second IfcGeometricRepresentationContext instead of the perscribed sub-context. I fixed the post and included the extra two lines at the top, but the plan view should only have 2 dimensions. I also gave the door a height to make it cleaner.

Thanks Trevor, Can you attach or share a copy of that entire IFC file for me to play with?

How can I show one 2d representation and a different 3d representation in Revit?

Developers

TrevorV January 15, 2020, 9:43pm 12

Sure. Here’s the file of a wall with a doorless opening.Without the lines in plan view, there is just an empty gap in Revit. PlanVsModelExample.ifc (5.4 KB)

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How can I show one 2d representation and a different 3d representation in Revit?

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