GiD-Tcl special commands to create and delete materials and conditions:

GiD_CreateData create|delete material|material_base|condition ...
To create or delete materials or conditions:

GiD_CreateData create material <basename> <name> <values>
To create a material with the same question fields as a base material but different values:

<basename> this only applies to the create material operation, and is the base material from which the new material is derived;
<name> is the name of material itself;
<values> is a list of all field values for the new material.

GiD_CreateData delete material|material_base <name>
To delete a material

GiD_CreateData create material_base <name> {{question_1 ... question_n} ?{value_1 value_n}?}
To create a base material: (define the fields of a new material to be used to derive new materials from it)

<name> is the name of material;
<questions> and <values> are lists of all questions and values for the new material. If values are missing empty values are used.

GiD_CreateData create condition <name> <over_geometry> <over_mesh> {{question_1 ... question_n} ?{value_1 value_n}?}
To create a condition:

<over_geometry> must be over_point|over_line|over_surface|over_volume|over_layer|over_group
<over_mesh> must be over_node|over_element|over_face

GiD_CreateData delete condition <name>
To delete a condition:

Example:

set id_material [GiD_CreateData create material Steel Aluminium {3.5 4 0.2}]
GiD_CreateData delete material Aluminium
set id_condition [GiD_CreateData create condition surface_pressure over_surface over_face {{pressure} {0.0}}]
GiD_CreateData delete condition surface_pressure