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In the 3d world, render engine use a process known as super sampling to improve the quality of rendered output by decreasing the effect of aliasing. aliasing is a term to describe imperfections in the rendering process caused by color changes that are too drastic and that occur over too small of an area of screen space to be adequately depicted by the pixels that define the space. In a single still image, aliasing is certainly noticeable and can reduce realism, but if the same scene is set in motion, the results can be downright distracting and can ruin, what would otherwise be a great animation.
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