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IsFlammable

Parsed terrain flag that the engine never uses.

This setting has no runtime effect

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

Specification
Applies to
TerrainType
File
rules.ini
Section
[<ObjectType ID>]
Value
boolean
When omitted
no
Used by the game
No — loaded but not used

The flag neither makes a terrain object burn nor stops it burning. A terrain object can catch fire when its type has Armor=wood and does not set SpawnsTiberium=yes. TreeFlammability covers the full conditions and how fire spreads between terrain objects.