# SymmetryΒΆ

This geometrical operation allows to perform a symmetrical copy of your mesh or some of its elements.

To create a symmetrical copy:

1. From the Modification menu choose Transformation -> Symmetry item or click “Symmetry” button in the toolbar.

“Symmetry button”

One of the following dialogs will appear:

It is possible to mirror a mesh or some of its elements through:

“a point”

“an axis”

a plane (defined by a point and a normal to the plane)”

2. In the dialog:

• specify the elements for the symmetry operation:

• Select the whole mesh, submesh or group activating this checkbox; or
• choose mesh elements with the mouse in the 3D Viewer. It is possible to select a whole area with a mouse frame; or
• input the element IDs directly in ID Elements field. The selected elements will be highlighted in the viewer; or
• apply Filters. Set Filter button allows to apply a Filter Dialog to the selection of elements.
• depending on the nature of the mirror object:

• if the mesh is mirrored through a point, specify the coordinates of the point, either directly or by picking a mesh node;

• if the mesh is mirrored through an axis:

• specify the coordinates of the start Point of the axis, either directly or by picking a mesh node;
• 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;
• if the mesh is mirrored through a plane:

• specify the cooordinates of the Point lying on the plane, either directly or by picking a mesh node;
• 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.
• specify the conditions of symmetry operation:

• activate Move elements radio button to change the location of the selected elements within the current mesh;

• activate Copy elements radio button to duplicate the selected elements at the new location within the current mesh;

• 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);

• 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”.

• activate Preview check-box to show the result of transformation in the viewer;

• click Apply or Apply and Close button to confirm the operation.