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NOTE: In the Copy and Move windows, the button 
may be used to select existing points with the mouse, or alternativelly alternatively enter its number in the entry field. 
NOTE: If we look at the Copy Window, we can see an option called Collapse. By activating this option, point 6 will be merged with point 5 when the entities are copied. By labeling the entities we could verify that only one point has been created.
If the user does not choose option Collapse, when the entities are copied (in this case from point 1 to point 5) GiD would create a new point (point 6) with the same coordinates as point 5.
To finish the copy command click Select, select the surface and then press ESC. We obtain the following surfaces:
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NOTE: Another valid option would be to assign a size of 0 to all entities. This would eliminate all the previous size information as well as the information for the mesh, and the default options would become active.
Next, generate the mesh of the volume by choosing Mesh->Generate mesh. Another Auxiliary Window appears into which the size of the volumetric element must be entered. In this example, the value is 1. 
The mesh generated above is composed of tetrahedral elements of four nodes, but GiD also permits the use of hexahedral, eight-nodded structured elements.
We will generate a structured mesh of the volume of the cube. This is done by selecting Mesh->Structured->Volumes->Assign number of divisions to volume lines.
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