Method parent

src/model/ShadingSurface.cpp:51–55

      : PlanarSurface_Impl(other, model, keepHandle) {}

    boost::optional<ParentObject> ShadingSurface_Impl::parent() const {
      boost::optional<ParentObject> result;
      result = this->shadingSurfaceGroup();
      return result;
    }

    std::vector<ModelObject> ShadingSurface_Impl::children() const {
      std::vector<ModelObject> result;