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It is possible to define 3D models that will be rendered instead of the default sky sphere. This allows creating some interesting map-specific effects in addition to regular [[sky_box]]es. Some ideas:

  *  Large 3D structures around the map area, that move as if they were a part of the real map when the player's viewpoint moves.
  *  Moving objects in the sky.
  *  Animated clouds.

Note. When placing skymodels, the model is not scaled from the centre, it is scaled from the bottom left corner. So if you have the scale higher than 1 1 1 than it might be not placed correctly in the sky