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SpecialZOverlay

Parsed shape name that the engine never draws.

This setting has no runtime effect

The engine accepts and loads it, but no gameplay code uses the stored value.

Specification
Applies to
BuildingType
File
art.ini
Section
[<Image ID>]Image ID: Image= value; ObjectType ID when omitted
Value
string
When omitted
(empty)
Used by the game
No — loaded but not used

The value names a shape file without its extension. A non-empty one is loaded as the structure’s artwork is fetched, through the same theater name substitution the main image goes through, and kept on the type; no drawing path reads it afterward. A name matching no file in the mix archives leaves the type holding nothing, and changes nothing either way.

The depth a structure writes for other objects to sort against comes from BUILDNGZ.SHP, one shape shared by every BuildingType that no key replaces. A structure six or more cells wide is drawn without any depth shape at all, and so is a gate part way through opening or closing.