} else if (relatingMaterial instanceof IfcMaterialLayerSetUsage) { IfcMaterialLayerSetUsage ifcMaterialLayerSetUsage = (IfcMaterialLayerSetUsage) relatingMaterial; IfcMaterialLayerSet forLayerSet = ifcMaterialLayerSetUsage.getForLayerSet(); for (IfcMaterialLayer ifcMaterialLayer : forLayerSet.getMaterialLayers()) { IfcMaterial material = ifcMaterialLayer.getMaterial();