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Will return an integer with its material index
- GiD_Geometry get point|line|surface|volume <id> label_on
Will return 1 if the label flag is set to on (to be shown), 0 otherwise
- GiD_Geometry get point|line|surface|volume <id> selected
Will return 1 if the selected flag is set to on (to be drawn in red), 0 otherwise
list: to get a list of entity identifiers of a range or inside some layer
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