/// delta/angle between neighbor entities
/// \param thePoint1 [in] center for multi-rotation or start point for multi-translation
/// \param thePoint2 [in] end point for multi-translation (empty for multi-rotation)
/// delta/angle between neighbor entities
/// \param thePoint1 [in] center for multi-rotation or start point for multi-translation
/// \param thePoint2 [in] end point for multi-translation (empty for multi-rotation)