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39 lines
1.1 KiB
ReStructuredText
39 lines
1.1 KiB
ReStructuredText
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.. _aspect_ratio_3d_page:
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***************
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Aspect ratio 3D
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***************
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The **Aspect Ratio 3D** mesh quality criterion calculates the same parameter as the :ref:`aspect_ratio_page` criterion, but it is applied to 3D mesh elements: tetrahedrons, pentahedrons, hexahedrons, etc.
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* The **Aspect Ratio** of a **tetrahedron** 3D element defined by vertices {a,b,c,d } is calculated by the formula:
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.. image:: ../images/formula1.png
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:align: center
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* Other element types like polyhedron, pentahedron and hexahedron use the following formula:
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.. image:: ../images/formula2.png
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:align: center
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**To apply the Aspect Ratio 3D quality criterion to your mesh:**
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#. Display your mesh in the viewer.
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#. Choose **Controls > Volume Controls > Aspect Ratio 3D** or click **"Aspect Ratio 3D"** button of the toolbar.
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.. image:: ../images/image144.png
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:align: center
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.. centered::
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"Aspect Ratio 3D" button
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Your mesh will be displayed in the viewer with its elements colored according to the applied mesh quality control criterion:
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.. image:: ../images/image86.jpg
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:align: center
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**See Also** a sample TUI Script of a :ref:`tui_aspect_ratio_3d` operation.
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