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Let's open the cmas2d_customlib.tcl file and see how are we processing the event of GiD that is called when the user wants to calculate: GiD_Event_AfterWriteCalculationFile. After a few check of the environment, 'Cmas2d::WriteCalculationFile AfterWriteCalculationFile $filename ' is called (It is defined in scripts/writing.tcl).

First we need to do in this function is to call some initialization procedures:
To open the file for writing:

customlib::InitWriteFileGiD_WriteCalculationFile init $filename

To initialize the material's database, indicating wich which 'conditions' have materials assigned.

customlib::InitMaterials [list "Shells"] active

Then we write some headers and to write the number of elements and nodes, we call some GiD_Info Functions:

customlib::WriteStringGiD_WriteCalculationFile puts "[GiD_Info Mesh NumElements] [GiD_Info Mesh NumNodes]"

To write the nodes and their coordinates we need to prepare the format and call WriteCoordinates:

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for an integer node id and two reals x, y (z is omitted)

GiD_WriteCalculationFile coordinates -factor $mesh_factor "%5d %14.5e %14.5e%.0s\n"

As we can see, the format is prepared to write 2D coordinates (X & Y).

Next we need to write are the connectivities of the elements. For each element, we want to write it's id, it's nodes, and the material id that we assigned. In order to do this, again we prepare the parameters for the function WriteConnectivities:

set elements_conditions [list "Shells"]
set element_formats [list {"%10d" "element" "id"} {"%10d" "element" "connectivities"} {"%10d" "material" "MID"}]
customlib::WriteConnectivities $elements_conditions $element_formats active

Then, the material's block. To get and write the number of materials, there is a function, GetNumberOfMaterials:

set num_materials [customlib::GetNumberOfMaterials used]
customlib::WriteString "Nº Materials=GiD_WriteCalculationFile puts "Materials:"
GiD_WriteCalculationFile puts $num_materials"

And, to write the material information, again, we need to prepare the parameters to print the material's id and it's density, and call the function WriteMaterials

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set condition_list [list "Point_Weight"]
set condition_formats [list {"%1d" "node" "id"} {"%13.5e" "property" "Weight"}]
customlib::WriteNodesWriteNodesByGroup $condition_list $condition_formats "" active

Finally, all we need to do is to close the writing file

customlib::EndWriteFileGiD_WriteCalculationFile end ;