Postvisualization

In big-budget live action movies, an increasingly important part of the CGI pipeline is a step called "postvisualization," which means a series of shots with low-res digital effects created after principle photography.

(Direct link to video) This documentary explains the advantages that postvis gives the director and editor to allow them to make good storytelling decisions and bid the effects accurately before the expensive rendering of the final shots.
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Via CGBros