# Extrusion

Extrusion is a type of surface meshing by generation from discretized lines. It is used to build mesh elements of plus one dimension than the swept ones. Each swept 1D element produces one or more quadrangles (or triangles if one node of a rotated element lays on the revolution axis).

To use extrusion:

1. From the Modification menu choose the Extrusion item or click button in the toolbar. The following dialog box shall appear:

2. In this dialog box you should select

- the type of elements which will be extruded (1D or 2D),

- specify the IDs of the elements which will be extruded by selecting them in the 3D viewer or select the whole mesh or submesh,

- specify the vector along which the elements will be extruded,

- number of steps

3. Click the Apply or OK button.