2006-07-06 17:20:58 +06:00
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<h1><img src="image101.gif" width="27px" height="24px" border="0" class="img_whs1">Extrusion along a path</h1>
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<p>In principle, <span style="font-weight: bold;"><B>Extrusion along a path</B></span>
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works in the same way as <span style="font-weight: bold;"><B>Extrusion</B></span>,
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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. To get an idea of how this algorithm works,
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examine several examples, starting from the most simple case of extrusion
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along a straight edge. In all examples the same mesh will be extruded
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along different paths and with different parameters. This sample 2D mesh
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has two quadrangle faces and seven edges. Look at the picture, where white
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digits are the node numbers and green are the element numbers:</p>
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<p><span style="margin-left: 40px;"><img src="pics/mesh_for_extr_along_path.png" x-maintain-ratio="TRUE" width="387px" height="334px" border="0" class="img_whs2"> .</span></p>
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<p> </p>
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<ul type="disc" class="whs3">
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<li class=kadov-p><p><span style="font-weight: bold;"><B>Extrusion along
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a straight edge</B></span> (not using base point or angles)</p></li>
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</ul>
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<table x-use-null-cells cellspacing="0" width="100%" class="whs4">
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<col class="whs5">
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<col class="whs5">
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<tr valign="top" class="whs6">
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<td width="50%" class="whs7">
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<p class="whs8"><img src="pics/straight_before.png" x-maintain-ratio="TRUE" width="389px" height="334px" border="0" class="img_whs9"></td>
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<td width="50%" class="whs10">
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<p class="whs11"><img src="pics/straight_after.png" x-maintain-ratio="TRUE" width="389px" height="334px" border="0" class="img_whs9"></td></tr>
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</table>
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<p class="whs12"> </p>
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<p class="whs12">The left image shows a 1D path mesh, built
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on a linear edge, and the initial 2D mesh. The right image shows the result
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of extrusion of two edges (#1 and #2) of the initial mesh along the path.
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Node #1 of path mesh has been selected as <span style="font-weight: bold;"><B>Start
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node</B></span>.</p>
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<p class="whs12"> </p>
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<ul type="disc" class="whs3">
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<li class=kadov-p><p><span style="font-weight: bold;"><B>Extrusion along
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a curvilinear edge</B></span> (with and without angles)</p></li>
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</ul>
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<table x-use-null-cells cellspacing="0" width="100%" class="whs4">
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<col class="whs13">
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<col class="whs13">
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<col class="whs13">
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<tr valign="top" class="whs6">
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<td width="33.333%" class="whs14">
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<p><img src="pics/curvi_simple_before.png" x-maintain-ratio="TRUE" width="389px" height="334px" border="0" class="img_whs9"></td>
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<td width="33.333%" class="whs15">
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<p><img src="pics/curvi_simple_after.png" x-maintain-ratio="TRUE" width="389px" height="334px" border="0" class="img_whs9"></td>
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<td width="33.333%" class="whs16">
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<p><img src="pics/curvi_angles_after.png" x-maintain-ratio="TRUE" width="389px" height="334px" border="0" class="img_whs9"></td></tr>
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<tr valign="top" class="whs6">
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<td width="33.333%" class="whs17">
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<p>The left image shows a 1D path mesh, built on curvilinear edge, and
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the initial 2D
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mesh.</td>
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<td width="33.333%" class="whs18">
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<p>The central image shows the result of extrusion of one edge (#2) of
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the initial mesh along the path. Node
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#1 of path mesh has been selected as <span style="font-weight: bold;"><B>Start
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node</B></span>.</td>
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<td width="33.333%" class="whs19">
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<p>The same, but using angles {45, 45, 45, 0, -45, -45, -45}</td></tr>
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</table>
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<p class="whs11"> </p>
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<ul type="disc" class="whs3">
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<li class=kadov-p><p class="whs11"><span style="font-weight: bold;"><B>Extrusion
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along a sub-mesh.</B></span></p></li>
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</ul>
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<table x-use-null-cells cellspacing="0" width="100%" class="whs4">
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<col class="whs5">
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<col class="whs5">
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<tr valign="top" class="whs6">
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<td width="50%" class="whs7">
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<p><img src="pics/edge_wire_before.png" x-maintain-ratio="TRUE" width="389px" height="334px" border="0" class="img_whs9"></td>
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<td width="50%" class="whs10">
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<p><img src="pics/edge_wire_after.png" x-maintain-ratio="TRUE" width="389px" height="334px" border="0" class="img_whs9"></td></tr>
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</table>
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<p class="whs12"> </p>
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<p class="whs12">In this example the path mesh has been built
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on a wire (polyline with six edges). The first edge of the wire was used
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as <span style="font-weight: bold;"><B>Shape (edge)</B></span>, node #1 as <span
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style="font-weight: bold;"><B>Start node</B></span>. The angles have been defined
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as {10, 10, 10}. The middle edge (#4) of the initial mesh has been extruded.</p>
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<p class="whs12"> </p>
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<ul type="disc" class="whs3">
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<li class=kadov-p><p class="whs20">Extrusion
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of 2d elements along a sub-mesh.</p></li>
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</ul>
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<table x-use-null-cells cellspacing="0" width="100%" class="whs4">
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<col class="whs5">
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<col class="whs5">
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<tr valign="top" class="whs6">
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<td width="50%" class="whs7">
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<p><img src="pics/edge_wire_3d_before.png" x-maintain-ratio="TRUE" width="389px" height="334px" border="0" class="img_whs9"></td>
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<td width="50%" class="whs10">
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<p><img src="pics/edge_wire_3d_after.png" x-maintain-ratio="TRUE" width="389px" height="334px" border="0" class="img_whs9"></td></tr>
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</table>
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<p class="whs12"> </p>
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<p class="whs12">This extrusion bases on the same path mesh
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as in the previous example but the third edge of the wire was set as <span
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style="font-weight: bold;"><B>Shape (edge)</B></span> and node #4 as <span style="font-weight: bold;"><B>Start
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node</B></span>. Please note, that the extrusion has been done in direction
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from node #4 to node #3, i.e. against the wire direction. In this example
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both faces of the initial mesh have been extruded.</p>
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<p class="whs12"> </p>
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<ul type="disc" class="whs3">
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<li class=kadov-p><p class="whs21">Extrusion of 2d elements
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along a closed path.</p></li>
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</ul>
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<table x-use-null-cells cellspacing="0" width="100%" class="whs4">
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<col class="whs13">
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<col class="whs13">
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<col class="whs13">
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<tr valign="top" class="whs6">
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<td width="33.333%" class="whs14">
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<p><img src="pics/circle_simple_before.png" x-maintain-ratio="TRUE" width="389px" height="334px" border="0" class="img_whs9"></td>
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<td width="33.333%" class="whs15">
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<p><img src="pics/circle_simple_after.png" x-maintain-ratio="TRUE" width="389px" height="334px" border="0" class="img_whs9"></td>
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<td width="33.333%" class="whs16">
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<p><img src="pics/circle_angles_after.png" x-maintain-ratio="TRUE" width="389px" height="334px" border="0" class="img_whs9"></td></tr>
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<tr valign="top" class="whs6">
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<td width="33.333%" class="whs17">
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<p>The left image shows a path mesh built on a closed edge (circle).</td>
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<td width="33.333%" class="whs18">
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<p>The central image shows the result of extrusion of both faces of the
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initial mesh. Note, that no sewing has been done, so, there are six coincident
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nodes and two coincident faces in the resulting mesh.</td>
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<td width="33.333%" class="whs19">
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<p>The same, but using angles {45, -45, 45, -45, 45, -45, 45, -45}</td></tr>
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</table>
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<p class="whs12"> </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="whs12">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_whs1"> button in the toolbar. The
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following dialog box will appear:</p>
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<p class="whs12"> </p>
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<p class=TODO
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style="margin-left: 80px;"><img src="pics/extrusion1.png" x-maintain-ratio="TRUE" width="441px" height="541px" border="0" class="img_whs22"></p>
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<p class="whs12"> </p>
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<p class="whs12">2. In the dialog box you should </p>
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<ul type="disc" class="whs3">
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<li class=kadov-p><p class="whs23">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="whs23">specify the <span style="font-weight: bold;"><B>IDs
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of the elements</B></span> which will be extruded by selecting them in the
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3D viewer or <span style="font-weight: bold;"><B>Select the whole mesh, submesh
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or group</B></span>,</p></li>
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<li class=kadov-p><p class="whs23">define the <span style="font-weight: bold;"><B>Path</B></span>
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along which the elements will be extruded, </p></li>
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</ul>
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<p class="whs24">Path definition consists of several elements
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</p>
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<ul type="disc" class="whs3">
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<li class=kadov-p><p class="whs25">Mesh
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- <span style="font-weight: normal;">containing a 1D sub-mesh on the edge,
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along which proceeds the extrusion.</span></p></li>
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<li class=kadov-p><p class="whs25">Shape
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(edge) - <span style="font-weight: normal;">as the mesh can be complex,
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the edge is used to define the sub-mesh for the path.</span></p></li>
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<li class=kadov-p><p class="whs25">Start
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node - <span style="font-weight: normal;"> the
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first or the last node on the edge. It is used to define the direction
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of extrusion.</span></p></li>
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</ul>
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<p class="whs12"> </p>
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<p class="whs12">3. There are two optional parameters, which
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can be very useful.</p>
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<ul type="disc" class="whs3">
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<li class=kadov-p><p class="whs23">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="whs23">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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You can set the values of angles at the right, add them to the list of
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angles at the left by pressing the <img src="image105.gif" width="26px" height="25px" border="0" class="img_whs26"> button and remove them
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from the list by pressing the <img src="image106.gif" width="29px" height="28px" border="0" class="img_whs27"> button. </p></li>
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</ul>
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<p class="whs12">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. Mesh edges
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will be extruded into faces, faces into volumes. The external surface
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of the resulting 3d mesh (if faces have been extruded) is covered with
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faces, and corners with edges. If the path is closed, the resulting mesh
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can contain duplicated nodes and faces, because no sewing is done.</p>
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<p class="whs12"> </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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