In IfcMaterialConstituent the Fraction attribute is indicated to be optional and can represent both volume or weight as a Normalised Ratio Measure (a 0-1 number).
In a complex object, fraction of weight and fraction of volume will lead to very different outcomes.
There is no further clarification at the IfcMaterialConstituentSet either.
In IfcMaterialConstituent the Fraction attribute is indicated to be optional and can represent both volume or weight as a Normalised Ratio Measure (a 0-1 number).
In a complex object, fraction of weight and fraction of volume will lead to very different outcomes.
There is no further clarification at the IfcMaterialConstituentSet either.
IfcMaterialConstituentSet