doc/salome/gui/VISU/files/about_structure_of_med_object.htm

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  87 <h1 class="whs1">About the structure \r
  88  of MED objects</h1>\r
  89 \r
  90 <p>&nbsp;<img src="../i_blue.jpg" x-maintain-ratio="TRUE" width="30px" height="30px" border="0" class="img_whs2">In <span style="font-weight: bold;"><B>Post-Pro</B></span> module \r
  91  3d representations are constructed on the base of &nbsp;submeshes \r
  92  representing parts of a mesh, which is stored in form of MED objects in \r
  93  *.med files. Each MED object has its own user-defined structure.</p>\r
  94 \r
  95 <p class="whs3">&nbsp;</p>\r
  96 \r
  97 <p class="whs3">In general, the mesh \r
  98  represents an object including the following types of data:</p>\r
  99 \r
 100 <p class="whs3">&nbsp;</p>\r
 101 \r
 102 <p class="whs4">&nbsp;- \r
 103  <span style="font-style: italic;"><I>Geometrical information</I></span>: list \r
 104  of nodes, edges, faces and cells of the mesh;</p>\r
 105 \r
 106 <p class="whs4">&nbsp;- \r
 107  <span style="font-style: italic;"><I>Information on the interpolation in \r
 108  accordance with resulting elements</I></span>: the mesh should be compatible \r
 109  with chosen interpolation;</p>\r
 110 \r
 111 <p class="whs5">&nbsp;- \r
 112  <span style="font-style: italic;"><I>Physical information</I></span>: initial \r
 113  and boundary conditions. (Scalar or vector values applied to the cells \r
 114  of the mesh)</p>\r
 115 \r
 116 <p class="whs3">&nbsp;</p>\r
 117 \r
 118 <p class="whs3">The structure of MED \r
 119  object has a tree-like form. It contains three main folders: <span style="font-weight: bold;"><B><a \r
 120  href="#Families">Families</a>, <a href="#Groups">Groups</a>, <a href="#Fields">Fields</a>.</B></span></p>\r
 121 \r
 122 <p class="whs3">&nbsp;</p>\r
 123 \r
 124 <p class="whs3">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<img src="../pics/snapfgf.png" x-maintain-ratio="TRUE" width="177px" height="274px" border="0" class="img_whs6"></p>\r
 125 \r
 126 <h3 class="whs7"><img src="../i_blue.jpg" x-save-file="TRUE" x-save-method="compute-relative" width="30px" height="30px" border="0" class="img_whs8"> <a name=Families></a>Families</h3>\r
 127 \r
 128 <p class="whs9">From \r
 129  general point of view, the whole mesh is divided into <span style="font-weight: bold;"><B>families</B></span>, \r
 130  submeshes created by the user. <span style="font-style: italic;"><I>Every \r
 131  </I></span><span style="font-weight: bold; font-style: italic;"><I><B>family</B></I></span><span \r
 132  style="font-style: italic;"><I> is composed of cells of a definite type &nbsp;- \r
 133  it can be Nodes, Edges, Faces or Cells.</I></span> The presentation created \r
 134  on the basis of a particular <span style="font-weight: bold;"><B>family </B></span>will \r
 135  be composed of geometrical elements, corresponding to the type of cells \r
 136  of this <span style="font-weight: bold;"><B>family. </B></span>&nbsp;</p>\r
 137 \r
 138 <p class="whs3">&nbsp;</p>\r
 139 \r
 140 <div align=left>\r
 141 <table x-use-null-cells width="100%" class="whs10">\r
 142 <script language='JavaScript'><!--\r
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 144 //--></script>\r
 145 <col class="whs11">\r
 146 <col class="whs11">\r
 147 \r
 148 <tr>\r
 149 <td width="50%" class="whs12">\r
 150 <p align="center" class="whs13">Type of cells (entities) of the family</td>\r
 151 <td width="50%" class="whs12">\r
 152 <p align="center" class="whs13">Geometrical element</td></tr>\r
 153 \r
 154 <tr>\r
 155 <td width="50%" class="whs12">\r
 156 <p align="center" class="whs14">Nodes</td>\r
 157 <td width="50%" class="whs12">\r
 158 <p align="center" class="whs14">Points</td></tr>\r
 159 \r
 160 <tr>\r
 161 <td width="50%" class="whs12">\r
 162 <p align="center" class="whs14">Edges</td>\r
 163 <td width="50%" class="whs12">\r
 164 <p align="center" class="whs14">Segments</td></tr>\r
 165 \r
 166 <tr>\r
 167 <td width="50%" class="whs12">\r
 168 <p align="center" class="whs14">Faces</td>\r
 169 <td width="50%" class="whs12">\r
 170 <p align="center" class="whs14">Triangles, quadrangles</td></tr>\r
 171 \r
 172 <tr>\r
 173 <td width="50%" class="whs12">\r
 174 <p align="center" class="whs14">Cells</td>\r
 175 <td width="50%" class="whs12">\r
 176 <p align="center" class="whs14">Any</td></tr>\r
 177 <script language='JavaScript'><!--\r
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 179 //--></script>\r
 180 </table>\r
 181 </div>\r
 182 <p align="center" class="whs15">Table of correspondence</p>\r
 183 \r
 184 <p class="whs3">&nbsp;</p>\r
 185 \r
 186 <p class="whs9">&nbsp;In \r
 187  the folder <span style="font-weight: bold;"><B>Families </B></span>all families \r
 188  of the mesh are put into the following subfolders, defining the type of \r
 189  cells of the mesh: <span style="font-weight: bold;"><B>onNodes, onEdges, \r
 190  onFaces, onCells. </B></span></p>\r
 191 \r
 192 <p class="whs9">These \r
 193  subfolders also represent submeshes of the mesh, which are composed of \r
 194  all cells of the mesh of this type.</p>\r
 195 \r
 196 <h3 class="whs7"><img src="../i_blue.jpg" x-save-file="TRUE" x-save-method="compute-relative" width="30px" height="30px" border="0" class="img_whs8"><a name=Groups></a>Groups</h3>\r
 197 \r
 198 <p class="whs3"><span style="font-weight: bold;"><B>Groups \r
 199  </B></span>combine different families independently of the type of cells, \r
 200  they are composed of. </p>\r
 201 \r
 202 <p class="whs3">&nbsp;</p>\r
 203 \r
 204 <h3 class="whs7"><img src="../i_blue.jpg" x-save-file="TRUE" x-save-method="compute-relative" width="30px" height="30px" border="0" class="img_whs8"><a name=Fields></a>Fields</h3>\r
 205 \r
 206 <p class="whs9"><span \r
 207  style="font-weight: bold;"><B>Fields </B></span>represent the results of calculations \r
 208  (it can be scalar or vector values), grouped together under one physical \r
 209  concept. </p>\r
 210 \r
 211 <p class="whs9">These \r
 212  values are applied to the cells of a definite submesh, which is indicated \r
 213  in the Object Browser in the subfolder of the <span style="font-weight: bold;"><B>field. \r
 214  </B></span></p>\r
 215 \r
 216 <p class="whs9">Most \r
 217  often the calculations are performed during some period of time. That's \r
 218  why <span style="font-weight: bold;"><B>fields </B></span>include <span style="font-weight: bold;"><B>Time \r
 219  Stamps, </B></span>representing the results of calculations in one definite \r
 220  moment. In <span style="font-weight: bold;"><B>Post-Pro </B></span>field presentation \r
 221  are constructed on the base of these <span style="font-weight: bold;"><B>Time \r
 222  Stamps. </B></span>(<a href="creating_field_presentations.htm">See: Creating \r
 223  field presentations</a>) &nbsp;</p>\r
 224 \r
 225 <p class="whs9">&nbsp;</p>\r
 226 \r
 227 <p class="whs3">&nbsp;</p>\r
 228 \r
 229 <p class="whs3">\r
 230 <a href="javascript:void(0);" onClick="var e; if (parseInt(navigator.appVersion)>=4){e=event;}  if (parseInt(navigator.appVersion) >=2 && typeof(PickupDialog_Invoke) == 'function') PickupDialog_Invoke(e,'','Creating field presentations','creating_field_presentations.htm','Creating presentations','creating_presentations.htm','Importing MED files','importing_med_objects.htm','Introduction','introduction.htm');return false;" title="Related Topics"><img src="../ss_btn_related_topics.gif" border=0 height=17 width=82 alt="Related Topics"></a>\r
 231 \r
 232 \r
 233  </p>\r
 234 \r
 235 <p class="whs3">&nbsp;</p>\r
 236 \r
 237 <p class="whs3">&nbsp;</p>\r
 238 \r
 239 <p class="whs3">&nbsp;</p>\r
 240 \r
 241 <p class="whs3">&nbsp;</p>\r
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