I want to assign the frame and glass different materials. Already I used the IfcMaterialConstituentSet and added the two materials. How can I visualise the styles also in the model.
Found the solution! Use the Representation Items and assign the materials according to the polygonal faces. The faces can be generated by duplicating and editing it in the latest release of bonsai.
And thanks to @steverugi's sleuthing, there's also this method, but currently there's a glitch where the type doesn't retain its IFCSHAPEASPECT assignment when imported into a project.