Enlarge one area of the mesh with the zoom.

Select Label->All on in->Nodes . The result is shown.

Each number identifies a node. There is a node for each element vertex.

The node identifiers created by generating the mesh appear on the screen. There is one identifier for each vertex of each element.
Select Mesh->Quadratic type->Quadratic.

NOTE : By default GiD meshes with polynomial degree=1 (linear) elements. To find out which mode GiD is working in, go to Mesh->Quadratic type.

Select Mesh->Generate mesh.
A window opens asking whether the previous mesh should be eliminated. Click Yes.
Another window appears in which the desired element size should be entered. Leave the default value unaltered and click OK.
Once the mesh has been generated, select Label->All on in->Nodes. The result is shown in next figure. Now, there are not only nodes at the vertices, but also at the midpoints of the edges of the elements.

Each number identifies a node. There is a node at each element vertex and at the midpoint of each edge.

Select Mesh->Quadratic type->Quadratic9.
Select Mesh->Generate mesh.
A window opens asking whether the previous mesh should be eliminated. Click Yes.
Another window appears in which the desired element size should be entered. Leave the default value unaltered and click OK.
Select Label->All on in->Nodes (see next figure).
Notice that the four-sided elements (quadrilaterals) also have a node in the center, in addition to the nodes at the vertices and midpoints of the edges. Similarly, hexahedra also have a node at their center point.

Each number identifies a node. There is a node at each vertex, at the midpoint of each edge and in the center of quadrilaterals and hexahedra.

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