mirror of
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6c4a9f32ed
+ Pre-open MED file to speed-up reading/writing (following 22349) + Clock-cursor in Display Entity dlg + In Filter dlg, do not perform filtering if it's not needed + In Group dlg, store a user-given name of a new group + Clock-cursor after hypothesis modif as mesh clearing can be long + Treat selected object right at opening of Measure dlgs + Allow removal of elements in a not shown mesh + Make filter work on a not shown mesh + Don't leave orphan nodes at RemoveGroupWithContents + Avoid crash when exporting a group + fields
174 lines
6.8 KiB
Plaintext
174 lines
6.8 KiB
Plaintext
/*!
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\page extrusion_along_path_page Extrusion along Path
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\n In principle, <b>Extrusion along Path</b> works in the same way
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as \ref extrusion_page "Extrusion", the main difference is that we define not a vector,
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but a path of extrusion which must be a 1D mesh or 1D sub-mesh.
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To get an idea of how this algorithm works, examine several examples,
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starting from the most simple case of extrusion along a straight edge.
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In the examples the sample mesh will be extruded along different
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paths and with different parameters.
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This 2D mesh has two quadrangle faces and seven edges. Look
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at the picture, where white digits are the node numbers and green
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are the element numbers:
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\image html mesh_for_extr_along_path.png
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<br><center><h2>Extrusion along a straight edge</h2>(not using base point
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or angles)</center>
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\image html straight_before.png
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<center>The image shows a 1D path mesh, built on a linear edge, and the initial 2D mesh.</center>
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\image html straight_after.png
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<center> The image shows the result of extrusion of two edges
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(#1 and #2) of the initial mesh along the path. \n Node #1 of path mesh
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has been selected as Start node.</center>
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<br><center><h2>Extrusion along a curvilinear edge</h2>(with and
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without angles)</center>
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\image html curvi_simple_before.png
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<center>The image shows a 1D path mesh, built on curvilinear edge, and
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the initial 2D mesh.</center>
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\image html curvi_simple_after.png
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<center>The central image shows the result of extrusion of one edge
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(#2) of the initial mesh along the path. \n Node #1 of path mesh has
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been selected as <b>Start node</b>.</center>
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\image html curvi_angles_after.png
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<center>The same, but using angles {45, 45, 45, 0, -45, -45, -45}</center>
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<br><center><h2>Extrusion of a 2D face along a mesh built on a wire</h2></center>
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In this example the path mesh has been built on a wire containing 3
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edges. Node 1 is a start node. Linear angle variation by 180 degrees
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has also been applied.
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\image html extr_along_wire_before.png
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<center><em>Meshed wire</em></center>
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\image html extr_along_wire_after.png
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<center><em>The resulting extrusion</em></center>
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<br><center><h2>Extrusion of 2d elements along a closed path</h2></center>
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\image html circle_simple_before.png
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<center>The image shows a path mesh built on a closed edge
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(circle).</center>
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\image html circle_simple_after.png
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<center>The central image shows the result of extrusion of both faces
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of the initial mesh. \n Note, that no sewing has been done, so, there are
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six coincident nodes and two coincident faces in the resulting
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mesh.</center>
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\image html circle_angles_after.png
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<center>The same, but using angles {45, -45, 45, -45, 45, -45, 45,
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-45}</center>
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<br><em>To use Extrusion along Path:</em>
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<ol>
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<li>From the \b Modification menu choose the <b>Extrusion along a
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path</b> item or click <em>"Extrusion along a path"</em> button in the toolbar.
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\image html image101.png
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<center><em>"Extrusion along a path" button</em></center>
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The following dialog will appear:
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\image html extrusion_along_path_dlg.png
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</li>
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<li>In this dialog:
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<ul>
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<li>Use \a Selection button to specify what you are going to
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select at a given moment, \b Nodes, \b Edges or \b Faces.
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\image html image120.png
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<center><em>"Selection" button</em></center>
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</li>
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<li>Specify \b Nodes, \b Edges and \b Faces, which will be extruded, by one
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of following means:
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<ul>
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<li><b>Select the whole mesh, sub-mesh or group</b> activating this
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checkbox.</li>
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<li>Choose mesh elements with the mouse in the 3D Viewer. It is
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possible to select a whole area with a mouse frame.</li>
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<li>Input the element IDs directly in <b>Node IDs</b>, <b>Edge
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IDs</b> and <b>Face IDs</b> fields. The selected elements will
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be highlighted in the viewer, if the mesh is shown there.</li>
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<li>Apply Filters. <b>Set filter</b> button allows to apply a
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filter to the selection of elements. See more about filters in
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the \ref filtering_elements "Selection filters" page.</li>
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</ul>
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</li>
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<li>Define the \b Path along which the elements will be extruded.<br>
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Path definition consists of several elements:
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<ul>
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<li><b>Mesh or submesh</b> - 1D mesh or sub-mesh, along which
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proceeds the extrusion.</li>
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<li><b>Start node</b> - the start node. It is used to define
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the direction of extrusion. </li>
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</ul>
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</li>
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<li>If you activate <b>Generate Groups</b> check-box, the <em>result elements</em>
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created from <em>selected elements</em> contained in groups will be
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included into new groups named by pattern "<old group
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name>_extruded" and "<old group name>_top". For example if a
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selected quadrangle is included in \a g_Faces group (see figures
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below) then result hexahedra will be included in \a
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g_Faces_extruded group and a quadrangle created at the "top" of
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extruded mesh will be included in \a g_Faces_top group. <br>
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\image html extrusion_groups.png
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\image html extrusion_groups_res.png
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<p> This check-box is active only if there are some groups in the mesh.
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</li>
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</ul>
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</li>
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<li>There are two optional parameters, which can be very useful:
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<ul>
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<li>If the path of extrusion is curvilinear, at each iteration the
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extruded elements are rotated to keep its initial angularity to the
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curve. By default, the <b>Base Point</b> around which the elements
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are rotated is the mass center of the elements, however, you can
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specify any point as the <b>Base Point</b> and the elements will be
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rotated with respect to this point.<br>
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Note that only the displacement of the <b>Base Point</b> exactly
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equals to the path, and all other extruded elements simply keep
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their position relatively to the <b>Base Point</b> at each
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iteration.</li>
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<li>The elements can also be rotated around the path to get the
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resulting mesh in a helical fashion. You can set the values of
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angles at the right, add them to the list of angles at the left by
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pressing the <em>"Add"</em> button and remove them from the list by
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pressing the <em>"Remove"</em> button.
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\image html add.png
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<center><em>"Add" button</em></center>
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\image html remove.png
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<center><em>"Remove" button</em></center>
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<b>Linear variation of the angles</b> option allows defining the angle
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of gradual rotation for the whole path. At each step the elements will
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be rotated by <code>angle / nb. of steps</code>.
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</li>
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</ul>
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</li>
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<li>Click \b Apply or <b> Apply and Close</b> button to confirm the
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operation. Mesh edges will be extruded into faces, faces into
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volumes. The external surface of the resulting 3d mesh (if faces
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have been extruded) is covered with faces, and corners with
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edges. If the path is closed, the resulting mesh can contain
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duplicated nodes and faces, because no sewing is done.
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</li>
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</ol>
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<br><b>See Also</b> a sample TUI Script of an
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\ref tui_extrusion_along_path "Extrusion along a Path" operation.
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*/
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