doc/salome/gui/SMESH/grouping_elements.htm

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  98 <h1>Grouping Elements</h1>
  99
 100 <h3><a name=bookmark>Create a Standalone Group</a></h3>
 101
 102 <p class="whs1">import SMESH_mechanic</p>
 103
 104 <p class="whs1">&nbsp;</p>
 105
 106 <p class="whs1">smesh &nbsp;=
 107  SMESH_mechanic.smesh</p>
 108
 109 <p class="whs1">mesh &nbsp;&nbsp;=
 110  SMESH_mechanic.mesh</p>
 111
 112 <p class="whs1">salome = SMESH_mechanic.salome</p>
 113
 114 <p class="whs1">&nbsp;</p>
 115
 116 <p class="whs2"># Get ids of all faces
 117  with area &gt; 100 </p>
 118
 119 <p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
 120  smesh.FT_Area, smesh.FT_MoreThan, 100.)</p>
 121
 122 <p class="whs1">&nbsp;</p>
 123
 124 <p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)
 125  </p>
 126
 127 <p class="whs1">&nbsp;</p>
 128
 129 <p class="whs3"># create a group consisting
 130  of faces with area &gt; 100</p>
 131
 132 <p class="whs1">&nbsp;</p>
 133
 134 <p class="whs1">aGroup = mesh.MakeGroupByIds(&quot;Area
 135  &gt; 100&quot;, smesh.FACE, anIds)</p>
 136
 137 <p class="whs1">&nbsp;</p>
 138
 139 <p class="whs3"><span style="font-family: 'Lucida Console', monospace;">salome.sg.updateObjBrowser(1)</span>
 140  </p>
 141
 142 <p class="whs3">&nbsp;</p>
 143
 144 <p class="whs3"><img src="pics/create_group.png" x-maintain-ratio="TRUE" width="430px" height="391px" border="0" class="img_whs4"></p>
 145
 146 <h3><a name=bookmark5>Create a Group on Geometry</a></h3>
 147
 148 <p class="whs1">import salome</p>
 149
 150 <p class="whs1">import geompy</p>
 151
 152 <p class="whs1">import smesh</p>
 153
 154 <p class="whs1">&nbsp;</p>
 155
 156 <p class="whs2"># create a box</p>
 157
 158 <p class="whs1">box = geompy.MakeBox(0.,
 159  0., 0., 100., 100., 100.)</p>
 160
 161 <p class="whs1">geompy.addToStudy(box,
 162  &quot;box&quot;)</p>
 163
 164 <p class="whs1">&nbsp;</p>
 165
 166 <p class="whs2"># add the first face
 167  of the box to the study</p>
 168
 169 <p class="whs1"><span style="font-family: 'Lucida Console', monospace;">subShapeList
 170  = geompy.SubShapeAll(box, geompy.ShapeType[&quot;FACE&quot;])</span></p>
 171
 172 <p class="whs1">face = subShapeList[0]</p>
 173
 174 <p class="whs1">geompy.addToStudyInFather(box,
 175  face, &quot;face 1&quot;) </p>
 176
 177 <p class="whs1">&nbsp;</p>
 178
 179 <p class="whs2"># create group of edges
 180  on the face</p>
 181
 182 <p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGeomGroupE
 183  = geompy.CreateGroup(face, geompy.ShapeType[&quot;EDGE&quot;])</span></p>
 184
 185 <p class="whs1">geompy.AddObject(aGeomGroupE,
 186  3)</p>
 187
 188 <p class="whs1">geompy.AddObject(aGeomGroupE,
 189  6)</p>
 190
 191 <p class="whs1">geompy.AddObject(aGeomGroupE,
 192  8)</p>
 193
 194 <p class="whs1">geompy.AddObject(aGeomGroupE,
 195  10)</p>
 196
 197 <p class="whs1">geompy.addToStudyInFather(face,
 198  aGeomGroupE, &quot;Group of Edges&quot;)</p>
 199
 200 <p class="whs1">&nbsp;</p>
 201
 202 <p class="whs2"># create quadrangle
 203  2D mesh on the box</p>
 204
 205 <p class="whs1"><span style="font-family: 'Lucida Console', monospace;">quadra
 206  = smesh.Mesh(box, &quot;Box : quadrangle 2D mesh&quot;)</span></p>
 207
 208 <p class="whs1">algo1D = quadra.Segment()</p>
 209
 210 <p class="whs1">quadra.Quadrangle()</p>
 211
 212 <p class="whs1">algo1D.NumberOfSegments(7)
 213  </p>
 214
 215 <p class="whs1">&nbsp;</p>
 216
 217 <p class="whs2"># compute the mesh</p>
 218
 219 <p class="whs1">quadra.Compute()</p>
 220
 221 <p class="whs1">&nbsp;</p>
 222
 223 <p class="whs2"># create SMESH group
 224  on the face with name &quot;SMESHGroup1&quot;</p>
 225
 226 <p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aSmeshGroup1
 227  = quadra.GroupOnGeom(face, &quot;SMESHGroup1&quot;)</span></p>
 228
 229 <p class="whs1">&nbsp;</p>
 230
 231 <p class="whs2"># create SMESH group
 232  on &lt;aGeomGroupE&gt; with default name</p>
 233
 234 <p class="whs1">aSmeshGroup2 = quadra.GroupOnGeom(aGeomGroupE)
 235  </p>
 236
 237 <p class="whs3">&nbsp;</p>
 238
 239 <p class="whs3"><span style="font-family: 'Lucida Console', monospace;">salome.sg.updateObjBrowser(1)</span>
 240  </p>
 241
 242 <h3><a name=bookmark1>Edit a Group</a></h3>
 243
 244 <p class="whs1">import SMESH_mechanic</p>
 245
 246 <p class="whs1">&nbsp;</p>
 247
 248 <p class="whs1">smesh &nbsp;=
 249  SMESH_mechanic.smesh</p>
 250
 251 <p class="whs1">mesh &nbsp;&nbsp;=
 252  SMESH_mechanic.mesh</p>
 253
 254 <p class="whs1">salome = SMESH_mechanic.salome</p>
 255
 256 <p class="whs1">&nbsp;</p>
 257
 258 <p class="whs2"># Get ids of all faces
 259  with area &gt; 35</p>
 260
 261 <p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
 262  smesh.FT_Area, smesh.FT_MoreThan, 35.)</p>
 263
 264 <p class="whs1">&nbsp;</p>
 265
 266 <p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)
 267  </p>
 268
 269 <p class="whs1">&nbsp;</p>
 270
 271 <p class="whs1">print &quot;Criterion:
 272  Area &gt; 35, Nb = &quot;, len(anIds)</p>
 273
 274 <p class="whs1">&nbsp;</p>
 275
 276 <p class="whs2"># create a group by
 277  adding elements with area &gt; 35</p>
 278
 279 <p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroup
 280  = mesh.CreateEmptyGroup(smesh.FACE, &quot;Area &gt; 35&quot;)</span></p>
 281
 282 <p class="whs1">aGroup.Add(anIds)
 283  </p>
 284
 285 <p class="whs1">&nbsp;</p>
 286
 287 <p class="whs2"># Get ids of all faces
 288  with area &gt; 40</p>
 289
 290 <p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
 291  smesh.FT_Area, smesh.FT_MoreThan, 40.)</p>
 292
 293 <p class="whs1">&nbsp;</p>
 294
 295 <p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
 296
 297 <p class="whs1">&nbsp;</p>
 298
 299 <p class="whs1">print &quot;Criterion:
 300  Area &gt; 40, Nb = &quot;, len(anIds) </p>
 301
 302 <p class="whs1">&nbsp;</p>
 303
 304 <p class="whs2"># create a group of
 305  elements with area [35; 40] by removing elements with area &gt; 40 from
 306  group aGroup</p>
 307
 308 <p class="whs1">aGroup.Remove(anIds)
 309  </p>
 310
 311 <p class="whs1">&nbsp;</p>
 312
 313 <p class="whs2"># print the result</p>
 314
 315 <p class="whs1">aGroupElemIDs =
 316  aGroup.GetListOfID()</p>
 317
 318 <p class="whs1">&nbsp;</p>
 319
 320 <p class="whs1">print &quot;Criterion:
 321  35 &lt; Area &lt; 40, Nb = &quot;, len(aGroupElemIDs)</p>
 322
 323 <p class="whs1">j = 1</p>
 324
 325 <p class="whs1">for i in range(len(aGroupElemIDs)):</p>
 326
 327 <p class="whs1">&nbsp;&nbsp;if
 328  j &gt; 20: j = 1; print &quot;&quot;</p>
 329
 330 <p class="whs1">&nbsp;&nbsp;print
 331  aGroupElemIDs[i],</p>
 332
 333 <p class="whs1">&nbsp;&nbsp;j
 334  = j + 1</p>
 335
 336 <p class="whs1">&nbsp;&nbsp;pass</p>
 337
 338 <p class="whs1">print &quot;&quot;</p>
 339
 340 <p class="whs1">&nbsp;</p>
 341
 342 <p class="whs1">salome.sg.updateObjBrowser(1)
 343  </p>
 344
 345 <p class="whs3">&nbsp;</p>
 346
 347 <p class="whs3"><img src="pics/editing_groups1.png" x-maintain-ratio="TRUE" width="463px" height="417px" border="0" class="img_whs5"> &nbsp;<img src="pics/editing_groups2.png" x-maintain-ratio="TRUE" width="541px" height="417px" border="0" class="img_whs6"></p>
 348
 349 <h3><a name=bookmark2>Union of two groups</a></h3>
 350
 351 <p class="whs1">import SMESH_mechanic</p>
 352
 353 <p class="whs1">&nbsp;</p>
 354
 355 <p class="whs1">smesh &nbsp;=
 356  SMESH_mechanic.smesh</p>
 357
 358 <p class="whs1">mesh &nbsp;&nbsp;=
 359  SMESH_mechanic.mesh</p>
 360
 361 <p class="whs1">salome = SMESH_mechanic.salome</p>
 362
 363 <p class="whs1">&nbsp;</p>
 364
 365 <p class="whs2"># Criterion : AREA
 366  &gt; 20</p>
 367
 368 <p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
 369  smesh.FT_Area, smesh.FT_MoreThan, 20.)</p>
 370
 371 <p class="whs1">&nbsp;</p>
 372
 373 <p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
 374
 375 <p class="whs1">&nbsp;</p>
 376
 377 <p class="whs1">print &quot;Criterion:
 378  Area &gt; 20, Nb = &quot;, len( anIds ) </p>
 379
 380 <p class="whs1">&nbsp;</p>
 381
 382 <p class="whs2"># create a group by
 383  adding elements with area &gt; 20</p>
 384
 385 <p class="whs1">aGroup1 = mesh.CreateEmptyGroup(SMESH.FACE,
 386  &quot;Area &gt; 20&quot;)</p>
 387
 388 <p class="whs1">aGroup1.Add(anIds)</p>
 389
 390 <p class="whs1">&nbsp;</p>
 391
 392 <p class="whs2"># Criterion : AREA
 393  = 20</p>
 394
 395 <p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aFilter
 396  = smesh.GetFilter(smesh.FACE, smesh.FT_Area, smesh.FT_EqualTo, 20.)</span></p>
 397
 398 <p class="whs1">&nbsp;</p>
 399
 400 <p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
 401
 402 <p class="whs1">&nbsp;</p>
 403
 404 <p class="whs1">print &quot;Criterion:
 405  Area = 20, Nb = &quot;, len( anIds ) </p>
 406
 407 <p class="whs1">&nbsp;</p>
 408
 409 <p class="whs2"># create a group by
 410  adding elements with area = 20</p>
 411
 412 <p class="whs1">aGroup2 = mesh.CreateEmptyGroup(
 413  smesh.FACE, &quot;Area = 20&quot; )</p>
 414
 415 <p class="whs1">&nbsp;</p>
 416
 417 <p class="whs1">aGroup2.Add(anIds)</p>
 418
 419 <p class="whs1">&nbsp;</p>
 420
 421 <p class="whs2"># create union group
 422  : area &gt;= 20</p>
 423
 424 <p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroup3
 425  = mesh.UnionGroups(aGroup1, aGroup2, &quot;Area &gt;= 20&quot;)</span></p>
 426
 427 <p class="whs1">print &quot;Criterion:
 428  Area &gt;= 20, Nb = &quot;, len(aGroup3.GetListOfID())</p>
 429
 430 <p class="whs1">&nbsp;</p>
 431
 432 <p class="whs2"># Criterion : AREA
 433  &lt; 20</p>
 434
 435 <p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aFilter
 436  = smesh.GetFilter(smesh.FACE, smesh.FT_Area, smesh.FT_LessThan, 20.)</span></p>
 437
 438 <p class="whs1">&nbsp;</p>
 439
 440 <p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
 441
 442 <p class="whs1">&nbsp;</p>
 443
 444 <p class="whs1">print &quot;Criterion:
 445  Area &lt; 20, Nb = &quot;, len(anIds)</p>
 446
 447 <p class="whs1">&nbsp;</p>
 448
 449 <p class="whs2"># create a group by
 450  adding elements with area &lt; 20</p>
 451
 452 <p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroup4
 453  = mesh.CreateEmptyGroup(smesh.FACE, &quot;Area &lt; 20&quot;)</span></p>
 454
 455 <p class="whs1">aGroup4.Add(anIds)</p>
 456
 457 <p class="whs1">&nbsp;</p>
 458
 459 <p class="whs2"># create union group
 460  : area &gt;= 20 and area &lt; 20</p>
 461
 462 <p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroup5
 463  = mesh.UnionGroups(aGroup3, aGroup4, &quot;Any Area&quot;)</span></p>
 464
 465 <p class="whs1">print &quot;Criterion:
 466  Any Area, Nb = &quot;, len(aGroup5.GetListOfID())</p>
 467
 468 <p class="whs1">&nbsp;</p>
 469
 470 <p class="whs1">salome.sg.updateObjBrowser(1)
 471  </p>
 472
 473 <p class="whs1">&nbsp;</p>
 474
 475 <p class="whs1"><img src="pics/union_groups1.png" x-maintain-ratio="TRUE" width="394px" height="425px" border="0" class="img_whs7"></p>
 476
 477 <p class="whs1">&nbsp;</p>
 478
 479 <p class="whs1"><img src="pics/union_groups2.png" x-maintain-ratio="TRUE" width="368px" height="379px" border="0" class="img_whs8"> <img src="pics/union_groups3.png" x-maintain-ratio="TRUE" width="344px" height="381px" border="0" class="img_whs9"></p>
 480
 481 <p class="whs1">&nbsp;</p>
 482
 483 <h3><a name=bookmark3>Intersection of two groups</a></h3>
 484
 485 <p class="whs1">import SMESH_mechanic</p>
 486
 487 <p class="whs1">&nbsp;</p>
 488
 489 <p class="whs1">smesh &nbsp;=
 490  SMESH_mechanic.smesh</p>
 491
 492 <p class="whs1">mesh &nbsp;&nbsp;=
 493  SMESH_mechanic.mesh</p>
 494
 495 <p class="whs1">salome = SMESH_mechanic.salome</p>
 496
 497 <p class="whs1">&nbsp;</p>
 498
 499 <p class="whs2"># Criterion : AREA
 500  &gt; 20</p>
 501
 502 <p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
 503  smesh.FT_Area, smesh.FT_MoreThan, 20.)</p>
 504
 505 <p class="whs1">&nbsp;</p>
 506
 507 <p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
 508
 509 <p class="whs1">&nbsp;</p>
 510
 511 <p class="whs1">print &quot;Criterion:
 512  Area &gt; 20, Nb = &quot;, len(anIds) </p>
 513
 514 <p class="whs1">&nbsp;</p>
 515
 516 <p class="whs2"># create a group by
 517  adding elements with area &gt; 20</p>
 518
 519 <p class="whs1">aGroup1 = mesh.CreateEmptyGroup(SMESH.FACE,
 520  &quot;Area &gt; 20&quot;)</p>
 521
 522 <p class="whs1">aGroup1.Add(anIds)</p>
 523
 524 <p class="whs1">&nbsp;</p>
 525
 526 <p class="whs2"># Criterion : AREA
 527  &lt; 60</p>
 528
 529 <p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
 530  smesh.FT_Area, smesh.FT_LessThan, 60.)</p>
 531
 532 <p class="whs1">&nbsp;</p>
 533
 534 <p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
 535
 536 <p class="whs1">&nbsp;</p>
 537
 538 <p class="whs1">print &quot;Criterion:
 539  Area &lt; 60, Nb = &quot;, len(anIds) </p>
 540
 541 <p class="whs1">&nbsp;</p>
 542
 543 <p class="whs2"># create a group by
 544  adding elements with area &lt; 60</p>
 545
 546 <p class="whs1">aGroup2 = mesh.CreateEmptyGroup(SMESH.FACE,
 547  &quot;Area &lt; 60&quot;)</p>
 548
 549 <p class="whs1">aGroup2.Add(anIds)</p>
 550
 551 <p class="whs1">&nbsp;</p>
 552
 553 <p class="whs2"># create an intersection
 554  of groups : 20 &lt; area &lt; 60</p>
 555
 556 <p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroup3
 557  = mesh.IntersectGroups(aGroup1, aGroup2, &quot;20 &lt; Area &lt; 60&quot;)</span></p>
 558
 559 <p class="whs1">print &quot;Criterion:
 560  20 &lt; Area &lt; 60, Nb = &quot;, len(aGroup3.GetListOfID())</p>
 561
 562 <p class="whs1">&nbsp;</p>
 563
 564 <p class="whs1">salome.sg.updateObjBrowser(1)
 565  </p>
 566
 567 <p class="whs3">&nbsp;</p>
 568
 569 <p class="whs3"><img src="pics/intersect_groups1.png" x-maintain-ratio="TRUE" width="314px" height="351px" border="0" class="img_whs10"> &nbsp;<img src="pics/intersect_groups2.png" x-maintain-ratio="TRUE" width="319px" height="351px" border="0" class="img_whs11"> &nbsp;<img src="pics/intersect_groups3.png" x-maintain-ratio="TRUE" width="304px" height="352px" border="0" class="img_whs12"></p>
 570
 571 <h3><a name=bookmark4>Cut of two groups</a></h3>
 572
 573 <p class="whs1">import SMESH_mechanic</p>
 574
 575 <p class="whs1">&nbsp;</p>
 576
 577 <p class="whs1">smesh &nbsp;=
 578  SMESH_mechanic.smesh</p>
 579
 580 <p class="whs1">mesh &nbsp;&nbsp;=
 581  SMESH_mechanic.mesh</p>
 582
 583 <p class="whs1">salome = SMESH_mechanic.salome</p>
 584
 585 <p class="whs1">&nbsp;</p>
 586
 587 <p class="whs2"># Criterion : AREA
 588  &gt; 20</p>
 589
 590 <p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
 591  smesh.FT_Area, smesh.FT_MoreThan, 20.)</p>
 592
 593 <p class="whs1">&nbsp;</p>
 594
 595 <p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
 596
 597 <p class="whs1">&nbsp;</p>
 598
 599 <p class="whs1">print &quot;Criterion:
 600  Area &gt; 20, Nb = &quot;, len(anIds) </p>
 601
 602 <p class="whs1">&nbsp;</p>
 603
 604 <p class="whs2"># create a group by
 605  adding elements with area &gt; 20</p>
 606
 607 <p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroupMain
 608  = mesh.MakeGroupByIds(&quot;Area &gt; 20&quot;, smesh.FACE, anIds)</span></p>
 609
 610 <p class="whs1">&nbsp;</p>
 611
 612 <p class="whs2"># Criterion : AREA
 613  &lt; 60</p>
 614
 615 <p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
 616  smesh.FT_Area, smesh.FT_LessThan, 60.)</p>
 617
 618 <p class="whs1">&nbsp;</p>
 619
 620 <p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
 621
 622 <p class="whs1">&nbsp;</p>
 623
 624 <p class="whs1">print &quot;Criterion:
 625  Area &lt; 60, Nb = &quot;, len(anIds) </p>
 626
 627 <p class="whs1">&nbsp;</p>
 628
 629 <p class="whs2"># create a group by
 630  adding elements with area &lt; 60</p>
 631
 632 <p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroupTool
 633  = mesh.MakeGroupByIds(&quot;Area &lt; 60&quot;, smesh.FACE, anIds)</span></p>
 634
 635 <p class="whs1">&nbsp;</p>
 636
 637 <p class="whs2"># create a cut of groups
 638  : area &gt;= 60</p>
 639
 640 <p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroupRes
 641  = mesh.CutGroups(aGroupMain, aGroupTool, &quot;Area &gt;= 60&quot;)</span></p>
 642
 643 <p class="whs1">print &quot;Criterion:
 644  Area &gt;= 60, Nb = &quot;, len(aGroupRes.GetListOfID())</p>
 645
 646 <p class="whs1">&nbsp;</p>
 647
 648 <p class="whs1">salome.sg.updateObjBrowser(1)
 649  </p>
 650
 651 <p class="whs1">&nbsp;</p>
 652
 653 <p class="whs3"><img src="pics/cut_groups1.png" x-maintain-ratio="TRUE" width="318px" height="355px" border="0" class="img_whs13"> &nbsp;<img src="pics/cut_groups2.png" x-maintain-ratio="TRUE" width="318px" height="355px" border="0" class="img_whs14"> &nbsp;<img src="pics/cut_groups3.png" x-maintain-ratio="TRUE" width="320px" height="354px" border="0" class="img_whs15"></p>
 654
 655 <script type="text/javascript" language="javascript1.2">
 656 <!--
 657 if (window.writeIntopicBar)
 658         writeIntopicBar(0);
 659 //-->
 660 </script>
 661 </body>
 662 </html>