I also found the code for opt 3

Recover the placement from the shape and then at some point invert it. Requires a bit of TopoDS_Iterator TopoDS_Shape.Location TopLoc_Location.Transformation

>>> import OCC.TopoDS
>>> import ifcopenshell
>>> import ifcopenshell.geom
>>> 
>>> settings = ifcopenshell.geom.settings()
>>> settings.set(settings.USE_PYTHON_OPENCASCADE, True)
>>> 
>>> file = ifcopenshell.open("Duplex_A_20110907_optimized.ifc")
>>> wall = file.by_type("IfcWall")[0]
>>> 
>>> product = ifcopenshell.geom.create_shape(settings, wall)
>>> shape = OCC.TopoDS.TopoDS_Iterator(product.geometry).Value()
>>> trsf = shape.geometry.Location().Transformation()
>>> trsf.TranslationPart().X(), trsf.TranslationPart().Y(), trsf.TranslationPart.Z()
(6.356, -11.55, 3.10000000000038)
>>>
>>> settings2 = ifcopenshell.geom.settings()
>>> product = ifcopenshell.geom.create_shape(settings2, wall)
>>> product.transformation.matrix.data
(0.0, 1.0, 0.0, -1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 6.356, -11.55, 3.100000000000378)

https://sourceforge.net/p/ifcopenshell/discussion/1782717/thread/a59607f6/#a112

Curious what approach you took in the end.

Uh oh!

ifcopenshell.geom.tesselate instances not emitted when added as representation #486

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