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[IfcOpenShell-Python] How to optimize the ifc file?

1. M by Martin156131 on 25 Aug 2022, edited 29 Aug 2022 #

   So i have created from this obj file https://github.com/Martin15135215/git_ifc_test/blob/main/test_obj_cubus/cubus_b.obj with this script https://github.com/IfcOpenShell/IfcOpenShell/blob/v0.7.0/src/blenderbim/scripts/obj2ifc-meshlab.py an ifc file https://github.com/Martin15135215/git_ifc_test/blob/main/test_obj_cubus/cubus_b.ifc.

   What I have noticed, for example, is that this IFCCARTESIANPOINT((-1.,1.,3.384652)) appears five times in the ifc file. Of course for this small ifc file it doesn't make that big a difference, but if the ifc file is bigger, this duplicate IFCCARTESIANPOINT unnecessarily makes the document bigger than it needs to be.

   Is there already a command for the optimization that I can execute before it is saved on line 83 in an ifc file?

   

   Somthing like ifcopenshell.api.run("optimize.remove_duplicate", file=self.file).

   i have found nothing in my research. i am happy if someone points it out to me.

2. T by theoryshaw on 25 Aug 2022 # +2 votes

   There's this patch discussed here, among other things.

3. T by theoryshaw on 26 Aug 2022 # +3 votes

   Started a wiki page for IFC Patch Recipes: https://wiki.osarch.org/index.php?title=BlenderBIM_Add-on/IFC_Patch_Recipes

4. M by Martin156131 on 28 Aug 2022 # +2 votes

   Thanks for the help @theoryshaw

   So i did add this code to the script:

   

   And it did manage to reduce the file size:

   

   6 to 4, it is like 30 %. not bad ?

5. M by Moult on 29 Aug 2022 # +1 votes

   @Martin156131 you can run it again to optimise it further (with diminishing returns).

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