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The purpose of the distance value is to make the background act more realistic
by moving up and down according to the camera movement
The distance value:
The bigger this number is, the more apparent are the
changes in the height of the background,
when the height of the camera changes. The background moves
up and down according to the height of the camera, to make it
look real (example: If you have a car going up or down a hill, the sky's
height must change(the sky is the background).)
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