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112 <h1>Constructing meshes</h1>
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114 <p class="whs1">Construction of a mesh consists of:</p>
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116 <p class="whs1"> </p>
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118 <ul type="disc" class="whs2">
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120 <li class=kadov-p><p class="whs1">Selecting a geometrical
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121 object for meshing</p></li>
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123 <li class=kadov-p><p class="whs1">Applying <a href="about_meshing_algorithms.htm">meshing
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124 algorithms</a> and <a href="about_hypotheses.htm">hypotheses</a> which
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125 will be used at computation of this mesh.</p></li>
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128 <p class="whs1"> </p>
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130 <p class=TODO>To construct a mesh:</p>
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132 <p class="whs3">1. In the <span style="font-weight: bold;"><B>Mesh
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133 </B></span>menu select<span style="font-weight: bold;"><B> Create Mesh </B></span>or
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134 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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137 <p class="whs3"> </p>
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139 <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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141 <p class="whs5"> </p>
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143 <p class="whs3">2. For example, you need to mesh a 3d object.
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146 <p class="whs3">First, type the name for your mesh in the
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147 "Name" box, by default, it is "Mesh_1". Then select
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148 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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149 the <img src="../image120.gif" width="34px" height="29px" border="0" class="img_whs8"> "Add" button. </p>
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151 <p class="whs3">Now you can define 1d Algorithm and 1d Hypotheses,
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152 which will be applied to the edges of your object. (Note that any object
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153 has edges, even if their existence is not apparent, for example, a sphere
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154 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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155 to define values for the current hypothesis. The use of additional hypotheses
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156 is optional (i.e. you may leave "None" in this box). </p>
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158 <p class="whs3"> </p>
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160 <p class="whs3">Proceed in the same way with 2d and 3d Algorithms
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161 and Hypotheses, note that the choice of hypotheses depends on the algorithm.
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162 There must be one Algorithm and one or several Hypotheses for each dimension
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163 of your object, otherwise you will not get any mesh at all. Of course,
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164 if you wish to mesh a face, which is a 2d object, you don't need to define
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165 3d Algorithm and Hypotheses. </p>
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167 <p class="whs3">In the <span style="font-weight: bold;"><B>Object
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168 Browser</B></span> the structure of the new mesh will be displayed as follows:</p>
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170 <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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172 <ul type="disc" class="whs2">
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174 <li class=kadov-p><p class="whs3">a reference to the
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175 geometrical object on the basis of which the mesh has been constructed;</p></li>
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177 <li class=kadov-p><p class="whs3"><span style="font-weight: bold;"><B>Applied
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178 hypotheses </B></span>folder containing the references to the hypotheses applied
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179 to the construction of the mesh;</p></li>
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181 <li class=kadov-p><p class="whs3"><span style="font-weight: bold;"><B>Applied
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182 algorithms </B></span>folder containing the references to the algorithms applied
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183 to the construction of the mesh.</p></li>
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186 <p class="whs3"> </p>
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188 <p class="whs3">There is an alternative way to create a mesh
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189 on an object simply by clicking <span style="font-weight: bold;"><B>Assign
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190 a set of hypotheses </B></span>button and selecting between Automatic Tetrahedralization
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191 or Hexahedralization. The
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192 program will automatically generate a 3D mesh with the most appropriate
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193 settings. In the same way you can apply this functionality for meshing
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194 2D objects, in which case 3D algorithms are not applied. </p>
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196 <p class="whs3"> </p>
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198 <p class="whs3">3. Now, when everything is ready, select
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199 your mesh in the <span style="font-weight: bold;"><B>Object Browser</B></span>.
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201 <span style="font-weight: bold;"><B>Mesh </B></span>menu select<span style="font-weight: bold;"><B>
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202 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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203 Computation information box appears.</p>
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205 <p class="whs3"> </p>
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207 <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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209 <p class="whs3"> </p>
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211 <p class="whs3">If the mesh computation failed, the information
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212 about the cause of the failure is provided. </p>
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214 <p class="whs3"> </p>
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216 <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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218 <p class="whs3"> </p>
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220 <p class="whs3">After you select the error, <span style="font-weight: bold;"><B>Show
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221 Subshape</B></span> button allows visualizing the mesh elements that cause
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224 <p class="whs3"> </p>
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226 <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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228 <p class="whs3"> </p>
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230 <p class="whs3"><span style="font-weight: bold;"><B>Publish
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231 Subshape</B></span> button allows importing it in a separate MED or UNV file.
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234 <p class="whs3"> </p>
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236 <table x-use-null-cells width="67.18%" cellspacing="0" class="whs16">
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238 <col class="whs18">
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240 <tr valign="top" class="whs19">
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241 <td width="65.545%" class="whs20">
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242 <p class="whs21"><span style="font-weight: bold;"><B>Note:</B></span>
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243 It is possible to define a 1D or a 2D mesh in a python script and then
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244 use such submeshes in the construction of a 3D mesh. For this, there exist
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245 two algorithms: <span style="font-weight: bold;"><B>Use existing edges</B></span>
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246 and <span style="font-weight: bold;"><B>Use existing faces</B></span>. They are
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247 not entirely usable from the GUI, so a mesh created using these algorithms
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248 should be exported into a python script, edited and then imported into
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250 <td width="34.455%" class="whs22">
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251 <p><img src="../image162.gif" width="214px" height="240px" border="0" class="img_whs23"></td></tr>
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254 <p class="whs24"> </p>
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256 <p class="whs3"> </p>
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258 <p class="whs3">Consider trying a sample script for construction
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259 of a mesh from our <a href="../constructing_meshes.htm">TUI Scripts</a>
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262 <p class="whs3"> </p>
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