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Autodesk / revit-ifc

IFC for Revit and Navisworks (2019+)
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PR: Roofs with inserts not exported as aggregations in IFC4 RVArch #652

Open andydandy74 opened 1 year ago

andydandy74 commented 1 year ago

Problem Description

When a roof contains an inserted object (e.g. an opening) it is exported as a singular IfcRoof element, not as an aggregation that contains an IfcSlab element. Since this didn't happen in IFC2x3 CV2 (and still doesn't) I am curious whether this is by design or should be treated as a bug? It would be great to have the same behaviour (export as aggregation) here in both cases - e.g. the nested IfcSlab provides better base quantities.

Minimal model to reproduce: https://github.com/andydandy74/MyIssues/blob/master/RevitIFC652/134_IFC_RoofNotAggregated.rvt

grafik

Revit Version

2023.1.x

IFC for Revit Addon Version

23.3.0

Windows Version

10 22H2

AngelVelezSosa commented 1 year ago

It's both a possible improvement (vs a bug) and a funny think you should mention...

  1. Possible improvement: I agree that we should export aggregates when we can. Not exporting an aggregate is allowed, though, so isn't technically a bug. But we could try to detect these cases better.
  2. Some customers are complaining when it is exported as an aggregate at all, so we have looked at the possibility of allowing a checkbox to never export as an aggregate. I wouldn't use that checkbox, but others would.
andydandy74 commented 1 year ago

Yes, I'm aware it's allowed to not export an aggregate and I wasn't entirely sure whether to post it as an issue, a feature request or a question. :-)