Hi, I think this is a bug! or is it me?
Then I Subdivide an edge (joining the arc) and I get the Error INVALID PROFILE when I 'Save Profile'
Hello ! Thanks for the report. The best place for issues or bug reports is over https://github.com/IfcOpenShell/IfcOpenShell
They're easier to track out there as we can directly tie topics and code commits for a better follow-up.
Cheers
@Gorgious I shall report this, I thought it may have been me not understanding how to Edit the slab
It's a usability bug. Basically vertices know if they are "special" (e.g. part of an arc). When you subdivide, Blender creates a new vertex. If that vertex is next to a arc there is a chance that it copies over the data and thinks that new vertex is part of the arc. You can tell because (if you deselect it first) it is blue.
Just click the vertex and S-X to reset the vertex.
