code/modules/shielding/helpers.dm 
| /proc/hull_shielding_get_tiles_around_area | HELPER FILE FOR SHIELDING Gets hull exterior adjacent tiles of a certain area Area method. EXPENSIVE. If the area itself is already considered exterior, it'll find all tiles inside it that's next to an interior area. |
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| /proc/hull_shielding_get_tiles_in_z | Gets hull adjacent exterior tiles of an entire zlevel EXPENSIVE. Gets the tiles in the exterior area touching to a non-exterior area |