Tried to ignore all the error warnings and kept on going, by when I wanted to export the IFC2x3. I got this warning AttributeError: entity instance of type 'IFC2X3.IfcFaceOuterBound' has no attribute 'ContextOfItems'
Yeah so the Migrate IFC patch does a pretty swell job at upgrading IFC2X3 to IFC4 (specify ["IFC4"] as an argument). However, although in theory it can downgrade, it would likely fail on a real project (it'll work for small subsets of data, though). This is because I never wrote the code to handle downgrading certain IFC4 geometry types since I never needed it and it was more urgent to upgrade than downgrade.
But let me know if you need downgrading and I can find a bit of time to implement it. It's pretty straightforward, just another item in the endless todo list.
What's pretty awesome too is that in the latest BlenderBIM Add-on builds since this is such a common thing, there is now a one-button upgrade whilst you're loading files:
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I just did an attempt with your model from the other thread.
Openened two sessions of BlenderBIM,
Got this error:
Now it's beyond my knowledge. I'm tempted to say it's not possible.
Tried to ignore all the error warnings and kept on going, by when I wanted to export the IFC2x3. I got this warning
AttributeError: entity instance of type 'IFC2X3.IfcFaceOuterBound' has no attribute 'ContextOfItems'I succeeded half, but it an extremely hacky way and probably lost all the data attached to the IFC elements.
I think there is an IfcPatch recipe just for this, I can't show a screenshot right now though.
This is the code for the patch (I think), for information :
https://github.com/IfcOpenShell/IfcOpenShell/blob/v0.7.0/src/ifcpatch/ifcpatch/recipes/Migrate.py
First argument should be the schema name.
Hope it helps
Yeah so the Migrate IFC patch does a pretty swell job at upgrading IFC2X3 to IFC4 (specify
["IFC4"]as an argument). However, although in theory it can downgrade, it would likely fail on a real project (it'll work for small subsets of data, though). This is because I never wrote the code to handle downgrading certain IFC4 geometry types since I never needed it and it was more urgent to upgrade than downgrade.But let me know if you need downgrading and I can find a bit of time to implement it. It's pretty straightforward, just another item in the endless todo list.
What's pretty awesome too is that in the latest BlenderBIM Add-on builds since this is such a common thing, there is now a one-button upgrade whilst you're loading files:
the argument for downgrading is then 'IFC2X3' ?