<li> create a mesh object, assign a 1D algorithm,</li>
<li> invoke \b Compute command, which computes a 1D mesh,</li>
<li> assign <b>Use existing faces</b> and a 3D algorithm,</li>
<li> run your python code, which creates a 2D mesh,</li>
<li> invoke \b Compute command, which computes a 3D mesh.</li>
<li> create a mesh object, assign a 1D algorithm,</li>
<li> invoke \b Compute command, which computes a 1D mesh,</li>
<li> assign <b>Use existing faces</b> and a 3D algorithm,</li>
<li> run your python code, which creates a 2D mesh,</li>
<li> invoke \b Compute command, which computes a 3D mesh.</li>