smesh/doc/salome/gui/SMESH/input/scale.rst

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.. _scale_page:
*****
Scale
*****
This geometrical operation allows to scale in space your mesh or some of its elements.
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*To scale a mesh:*
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#. From the **Modification** menu choose **Transformation** -> **Scale Transform** item.
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The following dialogs will appear, where you can select how to scale:
* with one scale factor:
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.. image:: ../images/scale01.png
:align: center
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* or with different scale factors for axes:
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.. image:: ../images/scale02.png
:align: center
#. In the dialog:
* specify the IDs of the translated elements:
* **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 to the selection of elements. See more about filters in the :ref:`selection_filter_library_page` page.
* specify the base point for scale
* specify the scale factor
* specify the conditions of scale:
* activate **Move elements** radio button to scale the selected mesh (or elements) without creating a copy;
* activate **Copy elements** radio button to duplicate the selected mesh (or elements) and to apply scaling to the copy within the same mesh;
* activate **Create as new mesh** radio button to leave the selected mesh (or elements) at its previous location and create a new mesh of the scaled copy of the selected elements; the new mesh appears in the Object Browser with the default name MeshName_scaled (it is possible to change this name in the adjacent box);
* activate **Copy groups** checkbox to copy the groups of elements existing in the source mesh to the newly created mesh.
* activate **Preview** checkbox to show the result of transformation in the viewer
* click **Apply** or **Apply and Close** button to confirm the operation.
**Example of using:**
#. Create quandrangle mesh 3x3 on a simple planar face (200x200)
.. image:: ../images/scaleinit01.png
:align: center
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and union 3 faces (along axis Z) to group "gr_faces"
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.. image:: ../images/scaleinit02.png
:align: center
#. Perform scale operation for the whole mesh and create a new mesh:
.. image:: ../images/scale03.png
:align: center
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result after operation:
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.. image:: ../images/scaleres03.png
:align: center
#. Perform scale operation for the whole mesh and copy elements:
.. image:: ../images/scale04.png
:align: center
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result after operation:
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.. image:: ../images/scaleres04.png
:align: center
#. Perform scale operation for a group of faces and copy elements:
.. image:: ../images/scale06.png
:align: center
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result after operation:
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.. image:: ../images/scaleres06.png
:align: center
#. Perform scale operation for two edges and move elements:
.. image:: ../images/scale07.png
:align: center
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result after operation:
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.. image:: ../images/scaleres07.png
:align: center
#. Perform scale operation for one face and move elements:
.. image:: ../images/scale09.png
:align: center
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result after operation:
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.. image:: ../images/scaleres09.png
:align: center
**See Also** a sample TUI Script of a :ref:`tui_scale` operation.