Add and reuse IfcMaterial properties

[claimred]

It seems to be very hard to add information to IfcMaterial.

In IFC4 it’s the very same concept Property Sets for Objects applies to IfcMaterial, the confusing thing here is that IfcMaterial is not an object. But it’s not that different - IfcMaterialProperties holds link to IfcMaterialDefinition with inverse HasProperties attribute.

Relevant discussion from not too long ago. With software examples.

Confusing documentation on IfcMaterialProperties

Correct, the concept is not the same. It’s not hard to figure out as you have, so I’m thankful that ArchiCAD has implemented it correctly. For what its worth, the BlenderBIM Add-on has also implemented material properties for a while now. All I’m saying is that the documentation currently doesn’t talk about how to do it, so one has to make assumptions It’s an easy documentation fix. Whether or not materials should become rooted, is a separate discussion You’re righ…