# Mesh line: about

## Definition

A mesh line is an algebraic expression, which, once assigned to a line, defines the distribution of the nodes on this line.

A mesh line sets the density of nodes on the line.

- arithmetic : uniformly distributed nodes (isotropic distribution on the line )
- geometric : nodes distributed in a geometrical progression (anisotropic distribution on the line)
- deviation : nodes distributed in accordance with a function of a deviation criterion
(d) *Note: * (d) is the distance between the center of the linear element and its projection on a curve. As long as the distance (d) is inferior to the deviation criterion expressed by the user, the software continues the cutting of the line into linear elements.

## Aided mesh

Within the framework of the administration of global adjustment via aided mesh :

- deviation a mesh line of type AIDED is created and assigned by default in Flux to all free curve lines
- the value and the type (relative or absolute) of this mesh line can only be modified via aided mesh

## Local setting

The local adjustment process comprises two phases:

- Creation of mesh lines
- Assignment of mesh lines to lines

## Parameter setting

Mesh lines allow the mesh parameter setting .

When the mesh parameter setting is associated with the geometry parameter setting (use of geometric parameters to define the mesh lines*) then the distances between nodes can vary along with the distances between points.

Note: * it is not possible to use geometric parameters for all types of mesh
line.