The following dialog common for line and planar elements will appear:
-\image html extrusion1.png
+\image html extrusion_along_path_dlg.png
</li>
<li>In this dialog:
</ul>
</li>
-<li>define the Path along which the elements will be extruded,
-\n Path definition consists of several elements:
-<ul>
-<li><b>Mesh or submesh</b> - 1D mesh or sub-mesh, along which proceeds the extrusion</li>
-<li><b>Start node</b> - the start node. It is used to define the direction of extrusion </li>
-</ul>
+<li>define the \b Path along which the elements will be extruded.<br>
+ Path definition consists of several elements:
+ <li><b>Mesh or submesh</b> - 1D mesh or sub-mesh, along which proceeds the extrusion</li>
+ <li><b>Start node</b> - the start node. It is used to define the direction of extrusion </li>
+ </ul>
</li>
-<li>activate <b>Generate Groups</b> checkbox if it is necessary to copy the groups of
-elements of the source mesh to the newly created one. </li>
+<li>activate <b>Generate Groups</b> checkbox if it is necessary to copy the groups of
+ elements of the source mesh to the newly created one. </li>
</ul>
</li>
<li>There are two optional parameters, which can be very useful:
<ul>
<li>If the path of extrusion is curvilinear, at each iteration the
-extruded shape is rotated to keep its initial angularity to the
-curve. By default, the <b>Base Point</b> around which the shape is rotated is
-the mass center of the shape, however, you can specify any point as
-the <b>Base Point</b> and the shape will be rotated with respect to this
-point.
+extruded elements are rotated to keep its initial angularity to the
+curve. By default, the <b>Base Point</b> around which the elements are rotated is
+the mass center of the elements, however, you can specify any point as
+the <b>Base Point</b> and the elements will be rotated with respect to this
+point.<br>
+ Note that it is the <b>Base Point</b> who goes exactly along the
+ path, and all the elements being extruded just keep their relative
+ position around the <b>Base Point</b> at each iteration.
</li>
-<li>The shape can also be rotated around the path to get the resulting
+<li>The elements can also be rotated around the path to get the resulting
mesh in a helical fashion. You can set the values of angles at the
right, add them to the list of angles at the left by pressing the <em>"Add"</em>
button and remove them from the list by pressing the <em>"Remove"</em> button.
<center><em>"Remove" button</em></center>
<b>Linear variation of the angles</b> option allows defining the angle of gradual rotation for the whole path.
-At each step the shape will be rotated by angle/nb. of steps.
+At each step the elements will be rotated by <code>angle / nb. of steps</code>.
</li>
</ul>
