This quality control criterion consists of calculation of length of the links between corner nodes of mesh faces.
To apply the Length 2D quality criterion to your mesh:
Display your mesh in the viewer.
Choose Controls > Face Controls > Length 2D or click "Length 2D" button in the toolbar.
Your mesh will be displayed in the viewer with links colored according to the applied mesh quality control criterion:
See Also a sample TUI Script of a Length 2D quality control operation.