/*!
-\page extrusion_along_path_page Extrusion along a path
+\page extrusion_along_path_page Extrusion along Path
-\n In principle, <b>Extrusion along a path</b> works in the same way
+\n In principle, <b>Extrusion along Path</b> works in the same way
as \b Extrusion, the main difference is that we define not a vector,
but a path of extrusion which must be a 1D mesh or 1D sub-mesh.
To get an idea of how this algorithm works, examine several examples,
<center>The same, but using angles {45, -45, 45, -45, 45, -45, 45,
-45}</center>
-<br><em>To use Extrusion along a path:</em>
+<br><em>To use Extrusion along Path:</em>
<ol>
<li>From the \b Modification menu choose the <b>Extrusion along a
path</b> item or click <em>"Extrusion along a path"</em> button in the toolbar.
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:
<li>specify the <b>IDs of the elements</b> which will be extruded
<ul>
-<li><b>Select the whole mesh, submesh or group</b> activating this
-checkbox; or</li>
-<li>choose mesh elements with the mouse in the 3D Viewer. It is
+<li><b>Select the whole mesh, sub-mesh or group</b> activating the corresponding check-box; or</li>
+<li>Choose mesh elements with the mouse in the 3D Viewer. It is
possible to select a whole area with a mouse frame; or</li>
-<li>input the element IDs directly in <b>ID Elements</b> field. The selected elements will be highlighted in the
+<li>Input the element IDs directly in <b>ID Elements</b> field. The selected elements will be highlighted in the
viewer; or</li>
<li>apply Filters. <b>Set filter</b> button allows to apply a filter to the selection of elements. See more
about filters in the \ref selection_filter_library_page "Selection filter library" page.</li>
</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> check-box 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 only the displacement of the <b>Base Point</b> exactly equals to the
+ path, and all other extruded elements simply keep their position relatively to 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>
