Skew mesh quality criterion reflects the angle between the lines that join opposite sides of a quadrangle element or the greatest angle between a median and a midline in a triangle element. This mesh quality criterion can be applied to elements composed of 4 and 3 nodes (quadrangles and triangles).
To apply the Skew quality criterion to your mesh:
Display your mesh in the viewer.
Choose Controls > Face Controls > Skew or click "Skew" button of the toolbar.
Your mesh will be displayed in the viewer with its elements colored according to the applied mesh quality control criterion:
See Also a sample TUI Script of a Skew quality control operation.