local Iterations = 10
local Iteration = 1

GroundZones = { "GroundZone1", "GroundZone2", "GroundZone3" }
GroundRandomizeZones = { "GroundRandomizeZone1", "GroundRandomizeZone2", "GroundRandomizeZone3" }
AirplaneZones = { "AirplaneZone1", "AirplaneZone2", "AirplaneZone3" }
HelicopterZones = { "HelicopterZone1", "HelicopterZone2", "HelicopterZone3" }
ShipZones = { "ShipZone1", "ShipZone2", "ShipZone3" }

HeightLimit = 500

SpawnGrounds = SPAWN:New("Ground"):InitLimit( 20, 10 )
SpawnRandomizeGrounds = SPAWN:New("GroundRandomize"):InitLimit( 20, 10 ):InitRandomizeUnits( true, 500, 100 )
SpawnAirplanes = SPAWN:New("Airplane"):InitLimit( 20, 10 )
SpawnHelicopters = SPAWN:New("Helicopter"):InitLimit( 20, 10 )
SpawnShips = SPAWN:New("Ship"):InitLimit( 20, 10 )

--- Spawns these groups slowly.
SCHEDULER:New( nil,

  function( Interation, Iterations )
    do
      -- Spawn Ground
      local ZoneName = GroundZones[ math.random( 1, 3 ) ]
      local SpawnVec3 = POINT_VEC3:NewFromVec3( ZONE:New( ZoneName ):GetVec3() )
      SpawnGrounds:SpawnFromVec2( SpawnVec3:GetVec2() )  
    end
    
    do
      -- Spawn Ground Randomize
      local ZoneName = GroundRandomizeZones[ math.random( 1, 3 ) ]
      local SpawnVec3 = POINT_VEC3:NewFromVec3( ZONE:New( ZoneName ):GetVec3() )
      SpawnRandomizeGrounds:SpawnFromVec2( SpawnVec3:GetVec2() )  
    end
    
    do
      -- Spawn Airplanes
      local ZoneName = AirplaneZones[ math.random( 1, 3 ) ]
      local SpawnVec3 = POINT_VEC3:NewFromVec3( ZONE:New( ZoneName ):GetVec3() )
      SpawnAirplanes:SpawnFromVec2( SpawnVec3:GetVec2() )  
      SpawnAirplanes:SpawnFromVec2( SpawnVec3:GetVec2(), 200, 500 )  
    end
    
    do
      -- Spawn Helicopters
      local ZoneName = HelicopterZones[ math.random( 1, 3 ) ]
      local SpawnVec3 = POINT_VEC3:NewFromVec3( ZONE:New( ZoneName ):GetVec3() )
      SpawnHelicopters:SpawnFromVec2( SpawnVec3:GetVec2() ) 
      SpawnHelicopters:SpawnFromVec2( SpawnVec3:GetVec2(), 2000, 4000 ) 
    end
    
    do
      -- Spawn Ships
      local ZoneName = ShipZones[ math.random( 1, 3 ) ]
      local SpawnVec3 = POINT_VEC3:NewFromVec3( ZONE:New( ZoneName ):GetVec3() )
      SpawnShips:SpawnFromVec2( SpawnVec3:GetVec2() )  
    end
    
  end, {}, 0, 15, 0.5 
)