"Animation and cameras are also added to the scene if required, movies tend to be outputted at 30 frames per second. Animating and outputting movies can take up quite a lot of time to output.  A 10 second movie has 300 frames @ 30 fps. So if each frame takes 1 minute to render the 10 second movie could take 1 computer 5 hours to output.  To speed up this process we can send the 3D file to various computers to be rendered, this is normally called a render farm. This dramatically speeds up the process, for example using x8 computers to output the above would reduce the render time from 5 hours to 38 minutes.  This also enables us to carry on using the main computer while the other computers ""Render Farm"" are busy outputting the files."
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