in computer graphics, refers to altering the size of a sprite to make the sprite appear nearer or farther from the player's point of view. It is a transformation that change the size or shape of an object . Scalling with respect to horizion can be carried out by multipling the corrdinate value x,y of a polygon , each end point of a line by scalling factor Sx and Sy to to produce the corrdinate x',y' .

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