To create a **Cartesian Grid** in the **Main Menu** select **Model -> Construction -> Make Grid**.

Three kinds of grid can be created:

- simple cartesian grid (see
*Simple cartesian grid*), - uniform cartesian grid (see
*Uniform cartesian grid*), - custom cartesian grid (see
*Custom cartesian grid*).

To create a simple cartesian grid, select radio button **Simple**:

**Dialogue Box for a Simple cartesian grid**

The following data are required:

*nb X*: The number of hexahedra along the X axis*nb Y*: The number of hexahedra along the Y axis*nb Z*: The number of hexahedra along the Z axis

The result of this action is:

**Simple Cartesian Grid**

TUI command: *Simple Cartesian Grid*

To create an uniform cartesian grid, select radio button **Uniform**:

**Dialogue Box for an Uniform cartesian grid**

The following data are required:

*origin*: The vertex of the origin*vec X*: The X vector*vec Y*: The Y vector*vec Z*: The Z vector*len X*: The length of an hexahedra on the X axis*len Y*: The length of an hexahedra on the Y axis*len Z*: The length of an hexahedra on the Z axis*nb X*: The number of hexahedra on the X axis*nb Y*: The number of hexahedra on the Y axis*nb Z*: The number of hexahedra on the Z axis

Clicking on “Apply” on the previous dialog box will produce the following grid (Uniform hexahedra, different sizes on the three axis):

**Unfiorm cartesian grid**

TUI command: *Uniform Cartesian Grid*

To create a Custom cartesian grid, select radio button **Custom**:

**Dialogue Box for a Custom cartesian grid**

The following data are required:

*origin*: The vertex of the origin*vec X*: The X vector*vec Y*: The Y vector*vec Z*: The Z vector*X*: A list of x values in ascendant order*Y*: A list of y values in ascendant order*Z*: A list of z values in ascendant order

A value on each axis gives the length of an hexahedra on that axis from the origin of the grid. For example the first value in the list of x values is the length on X axis of the first hexahedra from the origin.

The result of this action is:

**Custom cartesian grid**

TUI command: *Custom Cartesian Grid*