doc/salome/gui/SMESH/extrusion_along_a_path.htm

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  91 <h1>Extrusion along a path</h1>
  92
  93 <p>In principle, Extrusion along a path works in the same way as Extrusion,
  94  the main difference is that we define not a vector, but a path of extrusion
  95  which must be a meshed edge or wire. To get an idea of how this algorithm
  96  works, let's see the left image, where we have a 1D circle edge and &nbsp;a
  97  2D hexagon to be extruded along this path (in the picture they are angular
  98  because we show the wireframe of the mesh). And now let's see the right
  99  image, showing the result of the operation. &nbsp;</p>
 100
 101 <p>&nbsp;</p>
 102
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 109 <p><img src="image102.gif" width="335px" height="323px" border="0" class="img_whs5"></td>
 110 <td width="50%" class="whs6">
 111 <p><img src="image104.gif" width="350px" height="323px" border="0" class="img_whs7"></td></tr>
 112 </table>
 113
 114 <p>&nbsp;</p>
 115
 116 <p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</p>
 117
 118 <p>&nbsp;</p>
 119
 120 <p class=TODO>To use Extrusion along a path:</p>
 121
 122 <p class="whs8">1. From the <span style="font-weight: bold;"><B>Modification
 123  </B></span>menu choose the <span style="font-weight: bold;"><B>Extrusion along
 124  a path </B></span>item or click <img src="image101.gif" width="27px" height="24px" border="0" class="img_whs9"> button in the toolbar. The
 125  following dialog box will appear:</p>
 126
 127 <p class="whs8">&nbsp;</p>
 128
 129 <p class=TODO
 130         style="margin-left: 80px;"><img src="pics/a-extusionalongapath2.png" x-maintain-ratio="TRUE" width="434px" height="541px" border="0" class="img_whs10"></p>
 131
 132 <p class="whs8">&nbsp;</p>
 133
 134 <p class="whs8">2. In the dialog box you should &nbsp;</p>
 135
 136 <ul type="disc" class="whs11">
 137
 138         <li class=kadov-p><p class="whs12">select the type of
 139  elements which will be extruded (1D or 2D),</p></li>
 140
 141         <li class=kadov-p><p class="whs12">specify the IDs of
 142  the elements which will be extruded by selecting them in the 3D viewer
 143  or <span style="font-weight: bold;"><B>Select the whole mesh, submesh or
 144  grou</B></span>p,</p></li>
 145
 146         <li class=kadov-p><p class="whs12">specify the path along
 147  which the elements will be extruded, for this you should specify the <span
 148  style="font-weight: bold;"><B>Mesh</B></span>, the <span style="font-weight: bold;"><B>Shape</B></span>,
 149  and the <span style="font-weight: bold;"><B>Start point</B></span> for the extrusion.
 150  </p></li>
 151 </ul>
 152
 153 <p class="whs8">&nbsp;</p>
 154
 155 <p class="whs8">3. There are two optional parameters, which
 156  can be very useful.</p>
 157
 158 <ul type="disc" class="whs11">
 159
 160         <li class=kadov-p><p class="whs12">If the path of extrusion
 161  is curvilinear, at each iteration the extruded shape is rotated to keep
 162  its initial angularity to the curve. By default, the <span style="font-weight: bold;"><B>Base
 163  point</B></span> around which the shape is rotated is the mass center of the
 164  shape, however, you can specify any point as the <span style="font-weight: bold;"><B>Base
 165  Point</B></span> and the shape will be rotated with respect to this point.</p></li>
 166
 167         <li class=kadov-p><p class="whs12">The shape can also
 168  be rotated around the path to get the resulting mesh in a helical fashion.
 169  At the picture above we see both &quot;oblique-angled&quot; and &quot;right-angled&quot;
 170  mesh elements because <span style="font-weight: bold;"><B>Rotation Angles</B></span>
 171  have not been set for all iterations. You set the values of the angles
 172  at the right and add them to the list of angles at the left by pressing
 173  the <img src="image105.gif" width="26px" height="25px" border="0" class="img_whs13"> button and remove the values from the list by pressing
 174  the <img src="image106.gif" width="29px" height="28px" border="0" class="img_whs14"> button. </p></li>
 175 </ul>
 176
 177 <p class="whs8">4. Click the <span style="font-weight: bold;"><B>Apply
 178  </B></span>or <span style="font-weight: bold;"><B>OK </B></span>button.</p>
 179
 180 <p class="whs8">&nbsp;</p>
 181
 182 <p>&nbsp;<span style="font-weight: bold;"><B>See
 183  Also</B></span> a sample TUI Script of an <a href="modifying_meshes.htm#bookmark10">Extrusion
 184  along a Path</a> operation. &nbsp;</p>
 185
 186 <p>&nbsp;</p>
 187
 188 <p>&nbsp;</p>
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