Method centroid

src/model/PlanarSurface.cpp:505–509

    }

    Point3d PlanarSurface_Impl::centroid() const {
      boost::optional<Point3d> result = getCentroid(this->vertices());
      OS_ASSERT(result);
      return *result;
    }

    std::vector<ModelObject> PlanarSurface_Impl::solarCollectors() const {
      std::vector<ModelObject> result;