Esri multipatch feature OR SLPK/I3S to IFC

Question

IFC is our default file format for working on BIM related projects. Unfortunately, Esri doesn't support a native IFC file export (yet). However, when importing an IFC file via FME into a ArcGIS Pro geodatabase, it naturally get converted into a multipatch feature where you can do all kind of attribute wizardry.

However, people then request to get this modified multipatch feature back as a fully functional and valid IFC file. So my questions:

1.) what's our best option to return a multipatch feature back into an IFC file with correct attributes & geometry? Has anyone done this in FME so far and has some guidance?

2.) there's this open OGC standard for indexed 3D scene layers (I3S) which result in an slpk file, when exporting the multipatch feature for web usage. Since it has open specifications, did anyone try to create a suitable converter that goes from slpk to IFC? Has anyone tried this?

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Hi @vienna ,

If it's just the IFC attributes you are modifying in ArcGIS Pro, you could try merging the updated attributes from ArcGIS with the geometry from the original IFC file when creating a new IFC file.

We have an example on how to update and IFC file (in this case from Excel) at:

https://community.safe.com/s/article/updating-ifc-example

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daveatsafe · Answer

Hi @vienna​,If it's just the IFC attributes you are modifying in ArcGIS Pro, you could try merging the updated attributes from ArcGIS with the geometry from the original IFC file when creating a new IFC file.We have an example on how to update and IFC file (in this case from Excel) at:https://community.safe.com/s/article/updating-ifc-example

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