ArmA 2 3D Editor to World Tools

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ArmA 2 has build in 3D Editor which you can launch in main menu using ALT-E command.

Then you place objects in the 3D Editor and save your mission. You might need / want to use some editor addon to have more objects available in the editor.

Then use World Tools to read the SQM / BIEDI files and convert them into Visitor 3 readable format.