9 To **Replace an hexahedron** in the **Main Menu** select **Model -> Operation -> Replace Hexahedron**.
11 .. image:: _static/gui_replacehexa.png
15 Replace Hexahedron Dialog Box
18 The following data are required:
21 - Quad's source: the set of quads to be extruded (select quads).
22 - s1, s2, s3: vertices from the set of quads. (select vertices).
25 - d1, d2, d3: vertices which define the target quad.
26 As a result of the operation, each one are replaced: s1->d1, s2->d2, s3->d3 (select vertices).
29 Here is an example where the source quadrangles and vertices are highlighted:
31 .. image:: _static/before_replacehexa.png
39 .. image:: _static/replacehexa.png
45 TUI command: :ref:`tuireplacehexa`