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6 <title>Extrusion along a path</title>
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85 <h1>Extrusion along a path</h1>
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87 <p>In principle, Extrusion along a path works in the same way as Extrusion,
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88 the main difference is that we define not a vector, but a path of extrusion
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89 which must be a meshed edge or wire. To get an idea of how this algorithm
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90 works, let's see the left image, where we have a 1D circle edge and a
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91 2D hexagon to be extruded along this path (in the picture they are angular
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92 because we show the wireframe of the mesh). And now let's see the right
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93 image, showing the result of the operation. </p>
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101 <p><img src="image102.gif" width="335px" height="323px" border="0" class="img_whs5"></td>
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103 <p><img src="image104.gif" width="350px" height="323px" border="0" class="img_whs7"></td></tr>
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108 <p> </p>
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112 <p class=TODO>To use Extrusion along a path:</p>
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114 <p class=TODO> </p>
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116 <p class="whs8">1. From the <span style="font-weight: bold;"><B>Modification
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117 </B></span>menu choose the <span style="font-weight: bold;"><B>Extrusion along
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118 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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119 following dialog box shall appear:</p>
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121 <p class="whs8"> </p>
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125 <p><img src="image85.jpg" width="493px" height="537px" border="0" class="img_whs10"></p>
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129 <p class="whs8">2. In this dialog box you should </p>
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131 <ul type="disc" class="whs11">
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133 <li class=kadov-p><p class="whs8">select the type of
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134 elements which will be extruded (1D or 2D),</p></li>
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136 <li class=kadov-p><p class="whs8">specify the IDs of
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137 the elements which will be extruded by selecting them in the 3D viewer
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138 or <span style="font-weight: bold;"><B>Select the whole mesh, submesh or
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139 grou</B></span>p,</p></li>
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141 <li class=kadov-p><p class="whs8">specify the path along
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142 which the elements will be extruded, for this you should specify the <span
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143 style="font-weight: bold;"><B>Mesh</B></span>, the <span style="font-weight: bold;"><B>Shape</B></span>,
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144 and the <span style="font-weight: bold;"><B>Start point</B></span> for the extrusion.
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148 <p class="whs8"> </p>
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150 <p class="whs8">3. There are two optional parameters, which,
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151 nevertheless, can be very useful.</p>
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153 <ul type="disc" class="whs11">
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155 <li class=kadov-p><p class="whs8"> If
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156 the path of extrusion is curvilinear, at each iteration the extruded shape
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157 is rotated to keep its initial angularity to the curve. By default, the
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158 <span style="font-weight: bold;"><B>Base point</B></span> around which the shape
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159 is rotated is the mass center of the shape, however, you can specify any
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160 point as the <span style="font-weight: bold;"><B>Base Point</B></span> and the
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161 shape will be rotated with respect to this point.</p></li>
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163 <li class=kadov-p><p class="whs8">The shape can also
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164 be rotated around the path to get the resulting mesh in a helical fashion.
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165 At the picture above we see both "oblique-angled" and "right-angled"
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166 mesh elements because <span style="font-weight: bold;"><B>Rotation Angles</B></span>
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167 have not been set for all iterations. You set the values of the angles
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168 at the right and add them to the list of angles at the left by pressing
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169 the <img src="image105.gif" width="26px" height="25px" border="0" class="img_whs12"> button and remove the values from the list by pressing
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170 the <img src="image106.gif" width="29px" height="28px" border="0" class="img_whs13"> button. </p></li>
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173 <p class="whs8">4. Click the <span style="font-weight: bold;"><B>Apply
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174 </B></span>or <span style="font-weight: bold;"><B>OK </B></span>button.</p>
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176 <p class="whs8"> </p>
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