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89 lines
3.7 KiB
Plaintext
89 lines
3.7 KiB
Plaintext
/*!
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\page split_to_tetra_page Splitting volumes
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\n This operation allows to split either any volumic elements into
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tetrahedra or hexahedra into prisms. 2D mesh is modified accordingly.
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<em>To split volumes:</em>
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<ol>
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<li>Display a mesh, a sub-mesh or a group in the 3D viewer.</li>
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<li>In the \b Modification menu select the <b>Split Volumes</b> item or
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click <em>"Split Volumes"</em> button in the toolbar.
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\image html split_into_tetra_icon.png
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<center><em>"Split Volumes" button</em></center>
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The following dialog box will appear:
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\image html split_into_tetra.png
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<br>
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<b>Target element type</b> group of radio-buttons allows to select
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a type of operation. If \b Tetrahedron button is checked, then the
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operation will split volumes of any type into tetrahedra.
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If \b Prism button is checked, then the operation will split hexahedra
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into prisms, and the dialog will look as follows:
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\image html split_into_prisms.png
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<ul>
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<li>The main list contains list of volumes to split. You can click on
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a volume in the 3D viewer and it will be highlighted (lock Shift
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keyboard button to select several volumes). Click \b Add button and
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the ID of this volume will be added to the list. To remove the
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selected element or elements from the list click \b Remove button. <b>Sort
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list</b> button allows to sort the list of IDs. \b Filter button allows to
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apply a definite filter to the selection of volumes.
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<br><b>Note:</b> If you split not all adjacent non-tetrahedral
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volumes, your mesh becomes non-conform.</li>
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<li><b>Apply to all</b> radio button allows to split all
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volumes of the currently selected mesh.</li>
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</ul>
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<ul>
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<li><b> Split hexahedron </b> group allows to specify a method of
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splitting hexahedra.
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<ul>
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<li><b>Into N tetrahedra/prisms</b> allows to specify the number of
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tetrahedra or prisms a hexahedron will be split into. If the
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specified method does not allow to get a conform mesh, a generic
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solution is applied: an additional node is created at the gravity
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center of a hexahedron, serving an apex of tetrahedra, all
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quadrangle sides of the hexahedron are split into two triangles each
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serving a base of a new tetrahedron.</li>
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<li> <b> Facet to split </b> group allows to specify a side (facet) of a
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hexahedron to split into triangles when splitting into prisms.
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The facet to split is defined by specifying a point and a direction
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close to normal of the facet. The operation finds a hexahedron most
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close to the specified point and splits a facet whose normal is most
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close to the specified direction. Then the splitting is propagated
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from that hexahedron to all adjacent hexahedra.
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<ul>
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<li> <b> Hexa location </b> allows to specify a <em> start
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point </em> by which a first split hexahedron is found. <em>
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Selection button</em> switches to selection of the element whose
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barycenter will be used the start point and whose direction will be
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used as a normal to facet to split into triangles. To return to
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selection of volumes to split it is necessary to switch this button
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off. </li>
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<li> <b> Facet normal </b> allows to specify a direction of the
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normal to hexahedron facet to split into triangles.</li>
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</ul>
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<li><b> All domains </b> - if it is off the operation stops as all
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hehexedra adjacent to the start hexahedron are split into
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prisms. Else the operation tries to continue splitting starting from
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another hexahedron closest to the <b> Hexa location</b>. </li>
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</li>
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</ul>
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<li><b>Select from</b> a set of fields allows to choose a sub-mesh or an
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existing group whose elements will be added to the list as you ckick
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\b Add button.</li>
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</ul>
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<li>Click the \b Apply or <b>Apply and Close</b> button to confirm the operation.</li>
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</ol>
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*/
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