[IfcOpenShell] How to change element attributes, a note

M by mcnill on 25 Nov 2022, edited 28 Nov 2022 # +2 votes

My task is to remove transparency values of out of our Ifc files.

In our case i need to set the transparency value of "IfcSurfaceStyleRendering" to zero (0.).

I' ve searched quite a while to find out how to change (this) attribute(s) with IfcOpenShell. That's why i want to share how i did this.

Comments and notes welcome.

Edit: Please be aware that this is just snippet and cannot be executed on it's own.


surface_list = self.ifc.by_type("IfcSurfaceStyleRendering")

for surface in surface_list:

    try:

        ifcopenshell.api.run("attribute.edit_attributes", self.ifc, product=surface, attributes={"Transparency": 0.0})

        new_file_name = self.ifcfilepath.stem + "_intransparent" + self.ifcfilepath.suffix

        new_ifc_file_path = str(self.ifcfilepath.with_name(new_file_name))

        self.ifc.write(new_ifc_file_path)

        return True

    except Exception as err:

        print("Error on writing the new Ifc file: ", err)

        traceback.print_exception(*sys.exc_info())

        return False

C by camontellano on 25 Nov 2022, edited 25 Nov 2022 #

Hi,

I used to have a problem with Transparencies. Maybe this post can help:

https://community.osarch.org/discussion/1137/after-re-importing-all-styles-are-transparent

The Bug that was causing the issue was repaired. For files not being originally with BlenderBIM the solution for removing transparency with a simple search and replace may be easier.

M by mcnill on 28 Nov 2022 #

Hi, thank's for the feedback. We're not working with BlenderBIM but a different authoring tool. You're right, modifying with a text editor would work as well. But the team is a little bit bigger that's why i wanted to have a '1-click' GUI solution instead.