message: Arnaud's comment
diff: @@ -57,8 +57,8 @@ namespace RINGMesh
  plane_( plane )
  {
  Frame3D plane2d_frame( plane_.origin, plane_.normal );
  - u_axis_ = plane2d_frame.u_axis;
  - v_axis_ = plane2d_frame.v_axis;
  + u_axis_ = std::move( plane2d_frame.u_axis );
  + v_axis_ = std::move( plane2d_frame.v_axis );
  }
  protected:
  