GiD_Info bounding_box ?-geometry|-mesh|-post? ?-layers_off_also? ?point|line|surface|volume <entity_id>?
This command returns a list {x_min x_max y_min y_max z_min z_max} of the bounding box that contains the visualized model with the current settings (on layers) of preproces: depends on the current visualization mode: geometry or mesh.
If the extra flag-geometry, -mesh or -post is set then is used instead of the current visualization.
by default off layers are ignored, to change it can set -layers_off_also
It also could return the bounding box of a geometric entity, specified by its category and <entity_id>.
GiD - The personal pre and post processor
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