# Taper

Taper mesh quality criterion represents the ratio of the areas of two triangles separated by a diagonal. So it can be calculated only for elements consisting of 4 nodes.

To apply the Taper quality criterion to your mesh:

1. Display your mesh in the viewer.

2. Choose Controls > Taper or click button in 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 Taper quality control operation.