Method plane

src/model/PlanarSurface.cpp:460–465

    }

    Plane PlanarSurface_Impl::plane() const {
      if (!m_cachedPlane) {
        m_cachedPlane = Plane(this->vertices());
      }
      return m_cachedPlane.get();
    }

    Surface3d PlanarSurface_Impl::surface3d() const {
      return {this->vertices(), this->nameString(), 0};