declaration definition SBMaterialRef(Material *,BillboardOrigin) definition declaration addMaterialRef(const MaterialPtr &,BillboardOrigin) definition declaration getList() definition getMaterial() definition getOrigin() definition removeMaterialRef(const MaterialPtr &) definition declaration SBMaterialRef BillboardOrigin true true pass by value pass by value pass by value pass by value has by value Material true false pass by reference pass by reference has by reference MaterialPtr true false pass by reference pass by reference pass by reference pass by reference SBMaterialRefList true true has by value