Converting an IFC for Navisworks use

[fpensa]

Hi, we received IFC exported from Revit files. It is not possible to obtain the original Revit file. We need to use these IFC files in Navisworks and in Revit, so I first opened the IFC in Revit creating a new Revit files, then exported to NWC using the Navisworks Exporter Addin, and finally attached to a new NWF file. As a quality check, I also imported the IFC files into Navisworks directly, which created a different set of NWC files.

I encountered 2 problems:
- the IFC » RVT » NWC file has some extra elements showing compared to the IFC » NWC file. I'm not expert about how Revit IFC export works, but I assume that directly opening the IFC in Navisworks will show the Revit 3D view that has been originally exported, while opening the IFC in Revit and then exporting a new NWC will export the new Revit 3D view (with no filters, phases, ...)

- more important, the 2 NWC have slightly different coordinates. In Navisworks, both has the same X Y coordinates, while the Z coordinate and the rotation are different: rotation is 0 for the The IFC » RVT » NWC file (which has been exported per shared coordinates), while Zs are both different from 0. Is this a normal behaviour? Which set of coordinates is the right one?

[Tomislav.Golubovic]

I would personally just use the IFC in Navisworks. Importing and Exporting to and from products is going to cause grief, if not immediately, it will one day. I'd Transform the inserted IFC to its proper location/coordinates/rotation and then each time you update the file you don't have to do it all over again.

[fpensa]

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@Tomislav.Golubovic wrote:

I'd Transform the inserted IFC to its proper location/coordinates/rotation

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But that's the issue, which are the proper coordinates? The ones from the IFC»NWC or the ones from the IFC»RVT»NWC?

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@Tomislav.Golubovic wrote:

I would personally just use the IFC in Navisworks.

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Unfortunately, this is not an option, as we need the IFC in RVT. I only put them in Navisworks through 2 different methods to check on the conversion, and, as I feared, the results of the conversions were different (coordinates and objects shown)

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[fpensa]

...anyone from autodesk can maybe help out here and clarify how IFC converter provide different results in Revit and Navisworks?