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To get the most out of the IFC viewing / validation functionality within dRofus, make sure that the Rooms and Items in dRofus are linked with the corresponding Rooms or Spaces and Family Types in Revit before you export / upload the IFC model . The "Room Function Number" for Rooms and "Item Number" for Family Types must exist within Revit either as new or existing parameters. This will be later used when making adjustments within the IFC Configuration.
Export Using Revit then Upload Using the Client
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And then you can go to the dRofus Client and upload the IFC there. For details on how to do this, go to: Connecting to the IFC Model Server.
See Exporting to Industry Foundation Classes (IFC) on the Autodesk website to learn about required settings in Revit:
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For more information on IFC with dRofus, go to 04 IFC and BIM.