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80 lines
3.0 KiB
ReStructuredText
80 lines
3.0 KiB
ReStructuredText
.. _symmetry_page:
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********
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Symmetry
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********
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This geometrical operation allows to perform a symmetrical copy of your mesh or some of its elements.
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**To create a symmetrical copy:**
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#. From the **Modification** menu choose **Transformation** -> **Symmetry** item or click **"Symmetry"** button in the toolbar.
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.. image:: ../images/symmetry.png
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:align: center
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.. centered::
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"Symmetry button"
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One of the following dialogs will appear:
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It is possible to mirror a mesh or some of its elements through:
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.. image:: ../images/symmetry1.png
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:align: center
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.. centered::
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"a point"
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.. image:: ../images/symmetry2.png
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:align: center
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.. centered::
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"an axis"
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.. image:: ../images/symmetry3.png
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:align: center
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.. centered::
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a plane (defined by a point and a normal to the plane)"
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#. In the dialog:
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* specify the elements for the symmetry operation:
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* **Select the whole mesh, submesh or group** activating this checkbox; or
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* choose mesh elements with the mouse in the 3D Viewer. It is possible to select a whole area with a mouse frame; or
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* input the element IDs directly in **ID Elements** field. The selected elements will be highlighted in the viewer; or
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* apply Filters. **Set Filter** button allows to apply a :ref:`filtering_elements` to the selection of elements.
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* depending on the nature of the mirror object:
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* if the mesh is mirrored through a point, specify the coordinates of the point, either directly or by picking a mesh node;
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* if the mesh is mirrored through an axis:
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* specify the coordinates of the start **Point** of the axis, either directly or by picking a mesh node;
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* specify the components of axis **Vector**, either directly or by picking a mesh node, in which case **Vector** is defined as a shift between the **Point** and the node;
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* if the mesh is mirrored through a plane:
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* specify the cooordinates of the **Point** lying on the plane, either directly or by picking a mesh node;
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* specify the components of plane **Normal**, either directly or by picking a mesh node, in which case **Normal** is defined as a shift between the **Point** and the node.
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* specify the conditions of symmetry operation:
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* activate **Move elements** radio button to change the location of the selected elements within the current mesh;
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* activate **Copy elements** radio button to duplicate the selected elements at the new location within the current mesh;
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* activate **Create as new mesh** radio button to create a new element in a new mesh; the new mesh appears in the Object Browser with the default name *MeshName_mirrored* (it is possible to change this name in the adjacent box);
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* activate **Copy groups** check-box to put new mesh entities into new groups if source entities belong to some groups. New groups are named by pattern "<old group name>_mirrored".
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* activate **Preview** check-box to show the result of transformation in the viewer;
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* click **Apply** or **Apply and Close** button to confirm the operation.
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**See Also** a sample TUI Script of a
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:ref:`tui_symmetry` operation.
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