Terrain's in ArmA, as the engine is so great now we decided to generalize and call this section terrain instead of islands. You can still use WrpTool to edit ArmA WRP files, but all its ODOL format p3d files will cause “vertexInfo” error, you can skip these errors by just pressing the OK button or Space Bar.

Read initial information at PMC WRP Tutorial.

PMC provided the community with Empty WRP files for 102km and 204km sizes.

The big list of OFP objects in ArmA which helps you on island porting.

Object alignment heights here.

New WRP texture system: Layered Terrain Surface

Visitor 3 comref by Master85

Visitor 3 Quick Tutorial by Opteryx