In the IFC Translation Settings Dialog's Export Options panel click the Conversion OPtions button.
In the upcoming Dialog you will find the IFC Site location field. That controls whether the IFC Site Location within the IFC file will be at the ARCHICAD Project Origin or at the point the Survey Point object was placed in ARCHICAD.
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To date, all the IFC ArchiCAD experts I have seen has had the Local Placement Origin at 0,0,0 (line #57 above) in relation to the IFC Real World Coordiantes (as in the example above).
Does ArchiCAD 20 write the Project Origin or Survey Point to the Site IfcLocalPlacement, or does it depend on which IFC Translation Setup / Conversion Options / IFC Site Location is used?
And on Import, the above referenced Youtube clip mentions: "if ArchiCAD identifies a Survey Point in the IFC file, I will import it as a Survey Point GDL Object into the ArchiCAD Project at the lowest Level."
In this situation is it reading the Site IfcLocalPlacement as the Project Origin or Survey Point.
The outcomes of the above are going to have a big effect on how building origin to origin collaboration works across platforms, thus it is vital all IFC users are aware of how it works.
On Opening the above IFC file in ArchiCAD 20 and re-saving as an IFC file we got the following IFC output:
HEADER;FILE_DESCRIPTION(('ViewDefinition [CoordinationView_V2.0]','Option [Drawing Scale: 100.000000]','Option [Global Unique Identifiers (GUID): Keep existing]','Option [Elements to export: Visible elements (on all stories)]','Option [Partial Structure Display: Entire Model]','Option [IFC Domain: All]','Option [Structural Function: All Elements]','Option [Convert Grid elements: On]','Option [Convert IFC Annotations and ARCHICAD 2D elements: On]','Option [Convert 2D symbols of Doors and Windows: On]','Option [Explode Composite and Complex Profile elements into parts: Off]','Option [Export geometries that Participates in Collision Detection only: On]','Option [Multi-skin complex geometries: Building element parts]','Option [Elements in Solid Element Operations: Extruded/revolved]','Option [Elements with junctions: Extruded/revolved without junctions]','Option [Slabs with slanted edge(s): Extruded]','Option [Use legacy geometric methods as in Coordination View 1.0: Off]','Option [IFC Site Geometry: As boundary representation (BRep)]','Option [IFC Site Location: At Project Origin]','Option [Properties To Export: All properties]','Option [Space containment: Off]','Option [Bounding Box: Off]','Option [Geometry to type objects: Off]','Option [Element Properties: Off]','Option [Element Parameters: Off]','Option [IFC Base Quantities: Off]','Option [Window Door Lining and Panel Parameters: On]','Option [IFC Space boundaries: Off]','Option [ARCHICAD Zone Categories as IFC Space classification data: Off]'),'2;1');
FILE_NAME('C:\\Users\\Admin\\Desktop\\Brian Renehan\\FileOpenIFC then SaveasIFC\\FileOpenIFC then SaveasIFC.ifc','2017-06-13T20:44:21',('Architect'),('Building Designer Office'),'The EXPRESS Data Manager Version 5.02.0100.09 : 26 Sep 2013','IFC file generated by GRAPHISOFT ARCHICAD-64 20.0.0 AUS FULL Windows version (IFC2x3 add-on version: 5025 AUS FULL).','The authorising person');
What the previous IFC file exports show, is that it now looks like ArchiCAD 20 Imports and Exports IFC files in a similar manner than Autodesk Revit in regard to the IFC Site Local Placement - which is able to read the Survey Point:
The one error I did make when exporting the original IFC file out of Revit was that I used the "Include IFCSITE elevation in the site local placement origin:" setting, which adds the height datum to the IfcCartesianPoint as well as the IfcSite data (2500) thus in some applications doubling the height of the building.
Are other ArchiCAD 20 users able to confirm the above findings!
I am also interested to see if ArchiCAD 20+ will support a Survey point of Coordinate files up to UTM Coordinateshttps://en.wikipedia.org/wiki/Universal_Transverse_Mercator_coordinate_system, which can be up to a Northing of 10,000,000m (10,000 km)?
With the way, ArchiCAD 20 uses an object for the Survey Point, does this cause an issue of "Far from origin"? See: https://helpcenter.graphisoft.com/troubleshooting/3d-modeling/far-from-origin/#Why_can_Projects_be_Located_Far_From_Origin
Love to see other users findings and thoughts, and It would be great if Software Vendors, documented exactly how they read and write to the IFC SiteLocal Placement.
Is any good ArchiCAD 20+ user able to test if the Survey Point will work in a project if it's, 6,500,000,000mm (Northing Coordinate of Sydney under GDA94 / MGA94 Zone 56).
Can you see if you get any of the following issues:
- radial arcs and tangential lines won't trim or display correctly,
- graphical or view rendering errors,
- flickering/jumping items when orbiting/moving in 3D Open GL view,
- distortion/jumping when zooming in a long way 2D,
- lines may appear to flicker/jump on selection,
- hatches won't display/print correctly,
- drawings disappearing or displaying as empty on layouts/viewports,
- renders are missing lights or objects,