/*!
-\page reorient_faces_page Reorient faces by vector
+\page reorient_faces_page Orient faces
-\n This operation allows changing orientation of a set of neighboring
-faces. The desired orientation is defined by a vector. Since direction
-of face normals in the set can be even opposite, it is necessary to
-specify a control face whose normal will be compared with the vector. This
-face can be specified either explicitly or can be found by closeness to
-a given point.
+\n This operation allows fixing the orientation of a set of faces in
+the following ways:
+<ul>
+<li>The required orientation of a set of neighboring faces can be defined
+ by a vector giving the direction of a normal to a certain face. <br>
+ Since the direction of face normals in the set can be even opposite,
+ it is necessary to specify a \a control face, the normal to which
+ will be compared with the vector. This face can be either:
+ <ul>
+ <li>found by proximity to a given point, or</li>
+ <li>specified explicitly.</li>
+ </ul>
+</li>
+<li>Alternatively, the faces can be oriented relatively to the adjacent volumes.</li>
+</ul>
-Orientation of a face is changed by reverting the order of its nodes.
+The orientation of a face is changed by reverting the order of its nodes.
-<em>To change orientation of faces:</em>
+<em>To set orientation of faces:</em>
<ol>
-<li>In the \b Modification menu select the <b>Reorient faces by
- vector</b> item or click <em>Reorient faces by
- vector</em> button in the toolbar.
+<li>In the \b Modification menu select <b>Reorient faces</b>
+ item or click <em>Reorient faces</em> button in the toolbar.
<center>
\image html reorient_faces_face.png
-<em>"Reorient faces by vector" button</em>
+<em>"Reorient faces" button</em>
</center>
+</li>
+
+<li>In the "Reorient faces" dialog box
-The following dialog box will appear:
+<ul>
+<li>Select the \b Object (mesh, sub-mesh or group)
+ containing faces to reorient, in the Object Browser or in the 3D
+ Viewer.</li>
+<li>To reorient by direction of the face normal:
+ <ul>
+ <li>Specify the coordinates of the \b Point by which the control face
+ will be found. You can specify the \b Point by picking a
+ node in the 3D Viewer or selecting a vertex in the Object
+ Browser.</li>
+ <li>Set up the \b Direction vector to be compared with the normal of the
+ control face. There are following options: <ul>
+ <li>adjust vector components directly;</li>
+ <li>select a vertex in the Object Browser or a node in the 3D
+ Viewer; their coordinates will define vector components;</li>
+ <li> pick two nodes (holding Shift button), the \b Direction vector
+ will go from the first to the second node.</li>
+ </ul>
+ </ul>
+
+<br>
<center>
-\image html reorient_2d_point.png
-\image html reorient_2d_face.png
+\image html reorient_2d_point.png "The orientation of adjacent faces is chosen according to a vector. The control face is found by point."
+</center>
+
+</li>
+
+<li>In the second mode it is possible to pick the \b Face by mouse in the 3D Viewer or directly input the \b Face ID in the corresponding field.
+
+<center>
+\image html reorient_2d_face.png "The orientation of adjacent faces is chosen according to a vector. The control face is explicitly given."
</center>
-<li>In this dialog
-<ul>
-<li>Specify a way of selection of the control face: by point or
- explicitely.</li>
-<li>Select an \b Object containing faces to reorient, either in the Object
- Browser or in the 3D Viewer; it can be either <ul>
- <li>group of faces,</li>
- <li>sub-mesh of faces or</li>
- <li>mesh.</li>
- </ul></li>
-<li>Specify either coordinates of a \b Point by which the control face
- will be found or the control \b Face it-self. You can easy specify the \b
- Point by either picking a node in the 3D Viewer or by selecting a vertex
- in the Object Browser. The \b Face can be either picked by mouse in
- the 3D Viewer or its ID can be entered by typing.</li>
-<li>Set up a \b Direction to be compared with the normal of the
- control face. You can either pick a node in the 3D Viewer then a \b Direction
- from the coordinate system origin to the selected node will be set,
- or you can pick two nodes (holding Shift button) then a \b Direction
- from the first to the second node will be set.</li>
-</ul>
</li>
+<li>In the third mode, the faces can be reoriented according to volumes:
+ <ul>
+ <li>Select an object (mesh, sub-mesh or group) containing
+ reference \b Volumes, in the Object Browser or in the 3D
+ Viewer.</li>
+ <li>Specify whether face normals should point outside or inside
+ the reference volumes using <b>Face normal outside volume</b>
+ check-box.</li>
+ </ul>
+
+<br>
+<center>
+\image html reorient_2d_volume.png "The orientation of faces is chosen relatively to adjacent volumes."
+</center>
+
+</li>
+</ul>
+
<li>Click the \b Apply or <b>Apply and Close</b> button to confirm the operation.</li>
</ol>
<br><b>See Also</b> a sample TUI Script of a
-\ref tui_reorient_faces "Reorient faces by vector" operation.
+\ref tui_reorient_faces "Reorient faces" operation.
*/
