It is possible to invert their directions by selecting all vertices in Edit Mode and by pressing the Flip Normals button in the Mesh Tools Panel of the Editing ( F9 ) Context (Flipping normals.).

• 可以通过在编辑模式中选择所有顶点，按下编辑（F9）上下文网格工具面板中的翻转法线按钮反转它们的法线方向（翻转法线。）。