Pre-rendering

In computer graphics, pre-rendering or offline rendering is the technique of rendering images before playing them back at a later time, often on another computer system. It is contrasted with real-time rendering, where images are rendered and displayed within a time constraint, usually quickly enough to produce the illusion of motion.

Since rendering is more computationally expensive than playing back pre-rendered images, pre-rendering can be used where real-time rendering is not computationally feasible. More powerful computer systems, or more rendering time, can be used to render images or video for playback on less powerful computer systems, or when time constraints are tighter. As a result, pre-rendering has applications in interactive computer graphics, such as in video games and in 3D animation software.

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