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Thread: Hacking an IFC

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    Moderator snowyweston's Avatar
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    Hacking an IFC

    Can someone remind me how we manually hack the origin of an IFC for importing? I've distinct recollections of having a subbie do it for me before, but am presently working with someone not so au fait with such chicanery!

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    Forum Addict Robin Deurloo's Avatar
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    I remember mirroring some IFC files from within the IFC itself.
    I was basically opening it with notepad++ and changing numbers from positive to negative.
    Maybe that's what you can do for moving it as well??

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    Moderator snowyweston's Avatar
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    Quote Originally Posted by Robin Deurloo View Post
    I remember mirroring some IFC files from within the IFC itself.
    I was basically opening it with notepad++ and changing numbers from positive to negative.
    Maybe that's what you can do for moving it as well??
    That's what I remember - but edits so far have had no effect.

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    Fiddling with the IFC files requires some reading (at least with me it does). I searched for the IFCSITE keyword. In my sample file the last entries contained the world coordinates of the site. Somewhere near the IFCSITE entry should be something called IFCLOCALPLACEMENT that refers to an IFCAXIS2PLACEMENT3D entry which in turn looks at another entry called IFCCAARTESIANPOINT. I edited this latter one and the whole model was placed with the offset I had just entered.
    I suppose that if IFCLOCALPLACEMENT is set differently you may find your IFCSITE coordinates actually do something to the model's placement.
    This description worked out for me, but - although human readable - the IFC file is not meant for manual editing, so please be careful. As you have already purchased/leased Revit somehow, perhaps you are willing to pay even more money for a licence of SimpleBIM which allows some editing of given IFC files or so I hear.
    snowyweston likes this.

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