Do I need a navmesh to move and use behavior tree if my “AI” is flying and I am not using any pathfinding?

[anonymous_user_f53ee2a91 (anonymous_user_f53ee2a9)]

You might be looking for MoveDirectlyToward

If it’s a 2D space game you could get away with a nav mesh I suppose as long as it’s on an xy plane. If it’s 3D you could check out DoN’s 3D Pathfinding for Flying AI though I haven’t used it personally.