MOAISim.openWindow ( "test", 640, 480 )

     local viewport = MOAIViewport.new ()
     viewport:setSize ( 640, 480 )
     viewport:setScale ( 16, 0 )
     local main_layer = MOAILayer2D.new()
     local menu_layer = MOAILayer2D.new()
     game_layer = MOAILayer2D.new()

     local game_layer = game_layer
     main_layer:insertProp(game_layer)
     main_layer:insertProp(menu_layer)
     game_layer:setViewport ( viewport )
     MOAISim.pushRenderPass ( main_layer )--changing this to game layer works


     local world = MOAIBox2DWorld.new ()
     world:setGravity ( 0, -10 )
     world:setUnitsToMeters ( 2 )
     world:start ()
     game_layer:setBox2DWorld ( world )
     function onCollide() end
     body2 = world:addBody ( MOAIBox2DBody.STATIC )
     fixture2 = body2:addRect ( -5, -5, 5, -3 )
     fixture2:setFilter ( 0x02 )
     fixture2:setCollisionHandler ( onCollide, MOAIBox2DArbiter.BEGIN, 0x00 )