- <li>If the <b>Extrude to Distance</b> radio button is selected</li>
- <ul>
- <li>specify the distance at which the elements will be extruded.</li>
- </ul>
- <li>If the <b>Extrude Along Vector</b> radio button is selected</li>
- <ul>
- <li>specify the coordinates of the vector along which the elements
- will be extruded, or select the face (the normal to the face will
- define the vector),</li>
- <li>specify the distance of extrusion along the vector.</li>
+ <li>If the <b>Extrusion to Distance</b> radio button is selected
+ - specify the translation vector by which the elements will be extruded.
+ </li>
+ <p><br></p>
+
+\image html extrusionalongaline2.png
+
+ <li>If the <b>Extrusion Along Vector</b> radio button is selected
+ <ul>
+ <li>specify the coordinates of the \b Vector along which the elements
+ will be extruded, either directly or by selecting the mesh face (the
+ normal to the face will define the vector),</li>
+ <li>specify the \b Distance of extrusion along the vector (it can
+ be negative).</li>
+ </ul>
+ </li>
+ <p><br></p>
+
+\image html extrusionalongaline3.png
+
+ <li>If the <b>Extrusion By Normal</b> radio button is selected,
+ every node of the selected faces is extruded along the \a average
+ of the \a normal vectors to the faces sharing the node. (Nodes and
+ edges cannot be extruded in this mode.)
+ <ul>
+ <li>Specify the \b Distance of extrusion (it can be negative),</li>
+ <li>Use <b>Along average normal</b> check-box to specify along
+ which vector the distance is measured.
+ <ul>
+ <li>If it is \a activated the distance is measured along the
+ average normal mentioned above. </li>
+ <li>If it is \a deactivated every node is extruded along the
+ average normal till its intersection with a virtual plane obtained
+ by translation of the face sharing the node along its own normal
+ by the \b Distance.</li>
+ </ul>
+ The picture below shows a cross-section of a 2D mesh extruded
+ with <b>Along average normal</b> activated (to the left) and
+ deactivated (to the right).
+
+ \image html extrusionbynormal_alongavgnorm.png "'Along average normal' activated (to the left) and deactivated (to the right)"
+ <p></li>
+
+ <li><b>Use only input elements</b> check-box specifies what
+ elements will be used to compute the average normal.<ul>
+ <li> If it is \a activated only selected faces, among faces
+ sharing the node, are used to compute the average normal at
+ the node. </li>
+ <li>Else all faces sharing the node are used.</li></ul>
+
+ The picture below shows a cross-section of a 2D mesh the upper
+ plane of which is extruded with <b>Use only input elements</b>
+ activated (to the left) and deactivated (to the right).
+
+ \image html extrusionbynormal_useonly.png "'Use only input elements' activated (to the left) and deactivated (to the right)"
+ <p></li>
+ </li>