Modify the IfcObject's property/quantity

[pmorshed]

Hi,
Is it possible to modify the IfcObject's property/quantity value and then save ifc file with updated fields?
If so, can you give a simple example?

[jmirtsch]

Yes, this is possible.
GG provides a method to find a property set (or quantity set) by name. You can create it if it doesn't exist.

There is a method on a pset to add a property. This will displace any existing property of the same name.
You do need to be careful. A property (or quantity) set might be common to multiple elements. And the property/quantity
itself might be referenced in multiple property/quantity sets. So it's best to check, and duplicate the pset (if it is common)
and generate the property anew rather than simply change the assigned value.

If you want to generate an example file and have problems, you can create a pull request and I'll review it.