The Merge FloorSpaceJS with Model measure uses ThreeJS as an intermediary format. That scene is made on line 109 here https://github.com/NREL/openstudio-model-articulation-gem/blob/develop/lib/measures/merge_floorspace_js_with_model/measure.rb#L103-L117.

You may be able to update that to export a ThreeJS file One thing to keep in mind is an update to this measure in next few months will go direct from FoorSpaceJS to OOSM without withouot using ThreeJS. The I don't know abuot long term support of the ThreeJS methods in OpenStudio will be deprecated and then removed eventually. OpenStudio.

David