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103 <h1>Constructing meshes</h1>
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105 <p class="whs1">Construction of a mesh consists of:</p>
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107 <p class="whs1"> </p>
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109 <ul type="disc" class="whs2">
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111 <li class=kadov-p><p class="whs1">Selecting a geometrical
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112 object for meshing</p></li>
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114 <li class=kadov-p><p class="whs1">Applying <a href="about_meshing_algorithms.htm">meshing
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115 algorithms</a> and <a href="about_hypotheses.htm">hypotheses</a> which
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116 will be used at computation of this mesh.</p></li>
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119 <p class="whs1"> </p>
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121 <p class=TODO>To construct a mesh:</p>
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123 <p class="whs3">1. In the <span style="font-weight: bold;"><B>Mesh
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124 </B></span>menu select<span style="font-weight: bold;"><B> Create Mesh </B></span>or
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125 click <img src="../image32.gif" width="22px" height="24px" border="0" class="img_whs4"> button in the toolbar. The following dialog box will
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128 <p class="whs3"> </p>
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130 <p class="whs5"><img src="../pics/createmesh-inv.png" x-maintain-ratio="TRUE" width="370px" height="296px" border="0" class="img_whs6"></p>
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132 <p class="whs5"> </p>
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134 <p class="whs3">2. For example, you need to mesh a 3d object.
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137 <p class="whs3">First, type the name for your mesh in the
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138 "Name" box, by default, it is "Mesh_1". Then select
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139 the object you wish to mesh in the Object Browser <img src="../image119.gif" width="173px" height="88px" border="0" class="img_whs7">and click
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140 the <img src="../image120.gif" width="34px" height="29px" border="0" class="img_whs8"> "Add" button. </p>
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142 <p class="whs3">Now you can define 1d Algorithm and 1d Hypotheses,
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143 which will be applied to the edges of your object. (Note that any object
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144 has edges, even if their existence is not apparent, for example, a sphere
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145 has 4 edges). Click the <img src="../image121.gif" width="29px" height="28px" border="0" class="img_whs9"> button to add a hypothesis. Click the <img src="../image122.gif" width="30px" height="29px" border="0" class="img_whs10"> button
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146 to define values for the current hypothesis. The use of additional hypotheses
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147 is optional (i.e. you may leave "None" in this box). </p>
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149 <p class="whs3"> </p>
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151 <p class="whs3">Proceed in the same way with 2d and 3d Algorithms
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152 and Hypotheses, note that the choice of hypotheses depends on the algorithm.
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153 There must be one Algorithm and one or several Hypotheses for each dimension
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154 of your object, otherwise you will not get any mesh at all. Of course,
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155 if you wish to mesh a face, which is a 2d object, you don't need to define
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156 3d Algorithm and Hypotheses. </p>
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158 <p class="whs3">In the <span style="font-weight: bold;"><B>Object
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159 Browser</B></span> the structure of the new mesh will be displayed as follows:</p>
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161 <p class="whs3"><img src="../image88.jpg" width="232px" height="142px" align="right" border="0" class="img_whs11">It contains:</p>
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163 <ul type="disc" class="whs2">
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165 <li class=kadov-p><p class="whs3">a reference to the
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166 geometrical object on the basis of which the mesh has been constructed;</p></li>
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168 <li class=kadov-p><p class="whs3"><span style="font-weight: bold;"><B>Applied
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169 hypotheses </B></span>folder containing the references to the hypotheses applied
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170 to the construction of the mesh;</p></li>
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172 <li class=kadov-p><p class="whs3"><span style="font-weight: bold;"><B>Applied
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173 algorithms </B></span>folder containing the references to the algorithms applied
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174 to the construction of the mesh.</p></li>
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177 <p class="whs3"> </p>
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179 <p class="whs3">There is an alternative way to create a mesh
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180 on an object simply by clicking <span style="font-weight: bold;"><B>Assign
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181 a set of hypotheses </B></span>button and selecting between Automatic Tetrahedralization
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182 or Hexahedralization. The
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183 program will automatically generate a 3D mesh with the most appropriate
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184 settings. In the same way you can apply this functionality for meshing
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185 2D objects, in which case 3D algorithms are not applied. </p>
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187 <p class="whs3"> </p>
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189 <p class="whs3">3. Now, when everything is ready, select
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190 your mesh in the <span style="font-weight: bold;"><B>Object Browser</B></span>.
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192 <span style="font-weight: bold;"><B>Mesh </B></span>menu select<span style="font-weight: bold;"><B>
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193 Compute </B></span>or click <img src="../image28.gif" width="25px" height="24px" border="0" class="img_whs12"> button of the toolbar. The Mesh
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194 Computation information box appears.</p>
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196 <p class="whs3"> </p>
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198 <p class="whs3"><img src="../pics/meshcomputationsucceed.png" x-maintain-ratio="TRUE" width="457px" height="486px" border="0" class="img_whs13"></p>
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200 <p class="whs3"> </p>
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202 <p class="whs3">If the mesh computation failed, the information
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203 about the cause of the failure is provided. </p>
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205 <p class="whs3"> </p>
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207 <p class="whs3"><img src="../pics/meshcomputationfail.png" x-maintain-ratio="TRUE" width="564px" height="402px" border="0" class="img_whs14"> </p>
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209 <p class="whs3"> </p>
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211 <p class="whs3">After you select the error, <span style="font-weight: bold;"><B>Show
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212 Subshape</B></span> button allows visualizing the mesh elements that cause
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215 <p class="whs3"> </p>
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217 <p class="whs3"><img src="../pics/failed_computation.png" x-maintain-ratio="TRUE" width="260px" height="270px" border="0" class="img_whs15"> </p>
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219 <p class="whs3"> </p>
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221 <p class="whs3"><span style="font-weight: bold;"><B>Publish
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222 Subshape</B></span> button allows importing it in a separate MED or UNV file.
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225 <p class="whs3"> </p>
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227 <p class="whs3">Consider trying a sample script for construction
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228 of a mesh from our <a href="../constructing_meshes.htm">TUI Scripts</a>
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231 <p class="whs3"> </p>
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