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192 lines
7.3 KiB
HTML
192 lines
7.3 KiB
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<html>
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<head>
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<title>Extrusion along a path</title>
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<script type="text/javascript" language="javascript1.2" src="whutils.js"></script>
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</script>
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<h1>Extrusion along a path</h1>
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<p>In principle, Extrusion along a path works in the same way as Extrusion,
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the main difference is that we define not a vector, but a path of extrusion
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which must be a meshed edge or wire. To get an idea of how this algorithm
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works, let's see the left image, where we have a 1D circle edge and a
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2D hexagon to be extruded along this path (in the picture they are angular
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because we show the wireframe of the mesh). And now let's see the right
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image, showing the result of the operation. </p>
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<p> </p>
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<table x-use-null-cells cellspacing="0" width="100%" class="whs1">
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<tr valign="top" class="whs3">
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<td width="50%" class="whs4">
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<p><img src="image102.gif" width="335px" height="323px" border="0" class="img_whs5"></td>
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<td width="50%" class="whs6">
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<p><img src="image104.gif" width="350px" height="323px" border="0" class="img_whs7"></td></tr>
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</table>
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<p> </p>
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<p> </p>
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<p> </p>
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<p class=TODO>To use Extrusion along a path:</p>
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<p class="whs8">1. From the <span style="font-weight: bold;"><B>Modification
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</B></span>menu choose the <span style="font-weight: bold;"><B>Extrusion along
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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
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following dialog box will appear:</p>
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<p class="whs8"> </p>
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<p class=TODO><img src="pics/a-extusionalongapath2.png" x-maintain-ratio="TRUE" width="434px" height="541px" border="0" class="img_whs10"></p>
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<p class="whs8"> </p>
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<p class="whs8">2. In the dialog box you should </p>
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<ul type="disc" class="whs11">
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<li class=kadov-p><p class="whs12">select the type of
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elements which will be extruded (1D or 2D),</p></li>
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<li class=kadov-p><p class="whs12">specify the IDs of
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the elements which will be extruded by selecting them in the 3D viewer
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or <span style="font-weight: bold;"><B>Select the whole mesh, submesh or
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grou</B></span>p,</p></li>
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<li class=kadov-p><p class="whs12">specify the path along
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which the elements will be extruded, for this you should specify the <span
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style="font-weight: bold;"><B>Mesh</B></span>, the <span style="font-weight: bold;"><B>Shape</B></span>,
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and the <span style="font-weight: bold;"><B>Start point</B></span> for the extrusion.
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</p></li>
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</ul>
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<p class="whs8"> </p>
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<p class="whs8">3. There are two optional parameters, which
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can be very useful.</p>
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<ul type="disc" class="whs11">
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<li class=kadov-p><p class="whs12">If the path of extrusion
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is curvilinear, at each iteration the extruded shape is rotated to keep
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its initial angularity to the curve. By default, the <span style="font-weight: bold;"><B>Base
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point</B></span> around which the shape is rotated is the mass center of the
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shape, however, you can specify any point as the <span style="font-weight: bold;"><B>Base
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Point</B></span> and the shape will be rotated with respect to this point.</p></li>
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<li class=kadov-p><p class="whs12">The shape can also
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be rotated around the path to get the resulting mesh in a helical fashion.
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At the picture above we see both "oblique-angled" and "right-angled"
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mesh elements because <span style="font-weight: bold;"><B>Rotation Angles</B></span>
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have not been set for all iterations. You set the values of the angles
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at the right and add them to the list of angles at the left by pressing
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the <img src="image105.gif" width="26px" height="25px" border="0" class="img_whs13"> button and remove the values from the list by pressing
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the <img src="image106.gif" width="29px" height="28px" border="0" class="img_whs14"> button. </p></li>
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</ul>
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<p class="whs8">4. Click the <span style="font-weight: bold;"><B>Apply
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</B></span>or <span style="font-weight: bold;"><B>OK </B></span>button.</p>
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<p class="whs8"> </p>
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<p> <span style="font-weight: bold;"><B>See
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Also</B></span> a sample TUI Script of an <a href="modifying_meshes.htm#bookmark10">Extrusion
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along a Path</a> operation. </p>
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<p> </p>
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<p> </p>
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</html>
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