IFC CLASSIFICATION IN REVIT

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Creating acceptable IFC output can be a challenge. The property structure of an IFC file is as important as the geometry it contains.

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Creating acceptable IFC output can be a challenge. The property structure of an IFC file is as important as the geometry it contains.

One of the basic requirements is for a classification code to be contained in an IFC as an IfcClassificationReference. This can be achieved using the Alternative IFC UI (User Interface).

Here’s what you’ll need:

  1. Download and install the Alternative UI from either https://apps.autodesk.com/RVT/en/Detail/Index?id=3754730560173591798&appLang=en&os=Win32_64 or https://sourceforge.net/projects/ifcexporter/
  2. An IFC Shared Parameters (Available from http://revit.autodesk.com/library/Library/Revit%20Instruction%20&%20Help%20Samples/IFC/IFC%20Shared%20Parameters.txt)

Once loaded, the Shared Parameters contains ClassificationCode:

To export the IfcClassificationReference:

  1. Add the ClassificationCode parameter as a Project Parameter to all elements from Manage Settings > Project Parameters. Click Add…
  1. Set the Parameter Type to Shared Parameter and click Select…. From the Shared Parameters list, pick ClassificationCode.
  2. Set the parameter to be a Type property so that all instances are the same.
  3. Make sure that Group parameter under is set to IFC Parameters.
  4. Select all the Categories on the right-hand side to which you require the parameter to be available. (For consistency it can be easier to Check All.)
OK the Project Parameters box.
  1. Now, as you are placing elements, the ClassificationCode parameter will be available in the Type Properties window:
  1. Once modelling is complete and you are ready to produce the IFC, got to the Application Menu (the big blue R) > Export IFC. Click on Assignments….
  1. On the Classification tab, fill in the details of the classification system you are using and the parameter used in the Classification field name:
  1. Once this is set, export the IFC model and the classification will be created as an IfcClassificationReference:

 

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