# About quality controls

Mesh quality control in MESH is destined for visual control of the generated mesh.

Application of a definite quality control consists of usage of the corresponding algorithm, which calculates a value of a definite geometric characteristic (Area, Length of edges, etc) for all meshing elements, composing your mesh. Then all meshing elements are colored according the calculated values. The reference between the coloring of the meshing elements and these calculated values is shown with the help of a scalar bar, which is displayed near the presentation of your mesh.

There are 1D, 2D and 3D quality controls.

1D mesh quality controls:

- Free borders

- Borders at multi-connection

- Length

2D mesh quality controls:

- Free edges

- Length 2D

- Borders at multi-connection 2D

- Area

- Taper

- Aspect ratio

- Minimum angle

- Warping

- Skew

3D mesh quality controls:

- Aspect ratio 3D