Resolve the material definition directly associated with an element
(IfcMaterial / IfcMaterial*Set / *Usage). Mirrors the lookup at the top of
extractMaterialsOnDemand: occurrence association first, then the
element's type. Returns the definition express id, or undefined.
Resolve the material definition directly associated with an element (IfcMaterial / IfcMaterial*Set / *Usage). Mirrors the lookup at the top of extractMaterialsOnDemand: occurrence association first, then the element's type. Returns the definition express id, or undefined.