/*! \page reorient_faces_page Reorient faces \n This operation allows changing the orientation of a set faces in the following ways: The orientation of a face is changed by reverting the order of its nodes. To change orientation of faces:
  1. In the \b Modification menu select Reorient faces item or click Reorient faces button in the toolbar.
    \image html reorient_faces_face.png "Reorient faces" button
    The following dialog box will appear:
    \image html reorient_2d_point.png "The orientation of adjacent faces is chosen according to a vector. The control face is found by point."
  2. In this dialog
    • Select the \b Object (mesh, sub-mesh or group) containing faces to reorient, in the Object Browser or in the 3D Viewer.
    • To reorient according to vector:
      • Specify the coordinates of the \b Point by which the control face will be found. You can easy specify the \b Point by either picking a node in the 3D Viewer or selecting a vertex in the Object Browser. It is possible to pick the \b Face by mouse in the 3D Viewer or enter its ID.
      • Set up the \b Direction vector to be compared with the normal of the control face. If you pick a node in the 3D Viewer then the \b Direction vector will go from the coordinate system origin to the selected node. If you pick two nodes (holding Shift button) then the \b Direction vector will go from the first to the second node.
    • \image html reorient_2d_face.png "The orientation of adjacent faces is chosen according to a vector. The control face is explicitly given."
    • In the second mode it is possible to directly input the \b Face ID in the corresponding field.
    • \image html reorient_2d_volume.png "The orientation of faces is chosen with relation to adjacent volumes."
  3. In the third mode, the faces can be reoriented according to volumes:
  4. Click the \b Apply or Apply and Close button to confirm the operation.

See Also a sample TUI Script of a \ref tui_reorient_faces "Reorient faces" operation. */