*CrysMAS* was developed for axial symmetry, which is the normal
use case. But it can also simulate translational symmetry. In this case the geometry is
treated in Cartesian coordinates (2D simulation, coordinates x, y) and extended
infinitely in the third direction (z). No gradient is assumed in z-direction.

### Note

Be sure to change the symmetry before you switch to Materials Mode, because
symmetry has an impact on boundary conditions.

The default is axial symmetry. If you have to change it, proceed as follows:

Select
>
.

The symmetry dialog opens:

Click on the check box in front of
.

The symmetry basics is changed to translational.