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46 lines
1.4 KiB
ReStructuredText
46 lines
1.4 KiB
ReStructuredText
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.. _warping_page:
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*******
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Warping
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*******
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.. image:: ../images/image24.gif
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:align: center
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**Warping** indicates that a face is not planar and is applied only to
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2D elements with 4 nodes. This quality control criterion is based on a
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projection plane created by:
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#. bisecting the four element edges,
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#. creating a point on the plane at the vector average of the corners, where the x-axis extends from the point to the bisector on edge 2.
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The plane normal is in the direction of the cross product of the
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x-axis and the vector from the origin to the bisector of edge 3. Every
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corner of the quad will then be a distance *h* from the plane. The
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length of each half edge is measured and the shortest length is
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assigned *l*. The warp angle is the arcsine of the ratio of the
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projection height *h* to the half edge length *l*.
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**To apply the Warping quality criterion to your mesh:**
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#. Display your mesh in the viewer.
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#. Choose **Controls > Face Controls > Warping Angle** or click **"Warping angle"** button of the toolbar.
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.. image:: ../images/image39.png
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:align: center
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.. centered::
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**"Warping angle" 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/image97.jpg
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:align: center
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**See Also** a sample TUI Script of a
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:ref:`tui_warping` operation.
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