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Operation Flashpoint (OFP) aka ArmA: Cold War Assault (CWA)
Objects that are used in the Geometry or Fire Geometry LOD must be closed and convex in order to work.
To test for these qualities you can use the following methods:
Open Objects
Either select the objects manually or find them via
Structure → Topology → Find Non-Closed
Then close them via
Structure → Topology → Close
Non-Convex Objects
Either select the objects manually or find them via
Structure → Convexities → Find Non-Convexities
and then close them via
Structure → Convexities → Convex Hull
Or, alternatively, apply a
Structure → Convexities → Component Convex Hull
on all objects in the current LOD
Faces/Textures
In general it is also a good idea to test for any illegal/dead textures via
Structure → Check Faces