Can anyone confirm that the IFC exporter uses Revit's shared coordinate system by default? There was a post on the Revit Clinic blog that stated you could export to IFC via shared coordinates using the Location Weather and Site dialog box. That said, it doesn't make much sense to use that tool in a single model with shared coordinates as the Locations are meant to describe a single host model as it relates to multiple linked locations in a destination model.
Some of our testing with the latest exporter in Revit 2013 seems to suggest the Shared coordinates are used by default, but can we confirm that here?
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Can the exporter have an option to use the global coordinate system instead of using the current location, which uses the shared coordinate system? In essence, this would set the cartesian coordinates outlined in the post that James mentioned above to (0,0,0), instead of having to do it manually in the IFC file or by setting the current location to one where the shared coordinate system is exactly the same as the global coordinate system.
Yeah, "Current location" is a tool that has little to do directly with shared coordinates, rather it helps you manage a one-to-many file linking scenario. For example, a building that is linked into a site model multiple times. You can then open the building model and link in the site model and place it at location a, location b, and so on.
If you have a single model and you set the survey point to a unique location and then you export to IFC...the Location still says "Internal (Current)" - but I bet you'll get the survey point (shared) coordinates in the exported IFC.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Can anyone confirm that the IFC exporter uses Revit's shared coordinate system by default? There was a post on the Revit Clinic blog that stated you could export to IFC via shared coordinates using the Location Weather and Site dialog box. That said, it doesn't make much sense to use that tool in a single model with shared coordinates as the Locations are meant to describe a single host model as it relates to multiple linked locations in a destination model.
Some of our testing with the latest exporter in Revit 2013 seems to suggest the Shared coordinates are used by default, but can we confirm that here?
Revit uses the "Current" Site's Survey Point for IFC export, and have the past couple of releases.
Can the exporter have an option to use the global coordinate system instead of using the current location, which uses the shared coordinate system? In essence, this would set the cartesian coordinates outlined in the post that James mentioned above to (0,0,0), instead of having to do it manually in the IFC file or by setting the current location to one where the shared coordinate system is exactly the same as the global coordinate system.
For further reference, here is the post in question: http://revitclinic.typepad.com/my_weblog/2010/09/ifc-export-with-shared-or-project-coordinates-using-revit-2011.html
Last edit: David Baldacchino 2013-01-04
Yeah, "Current location" is a tool that has little to do directly with shared coordinates, rather it helps you manage a one-to-many file linking scenario. For example, a building that is linked into a site model multiple times. You can then open the building model and link in the site model and place it at location a, location b, and so on.
If you have a single model and you set the survey point to a unique location and then you export to IFC...the Location still says "Internal (Current)" - but I bet you'll get the survey point (shared) coordinates in the exported IFC.