This is the problem I have with Andy Serkis. The majority of people are completely ignorant about the whole mo-cap process, and people like Andy exploit that and take all the credit. He likes to make people think that the animators just press a magic button and the data is transferred from him to the digital character with no effort.
In reality, it is never that simple, not even close. Any recording will always have errors in, which the animators have to fix manually. This clean up stage is a long, tedious process which can take hours for a clip of just a few seconds.
Once clean up is done, the data has to applied to a virtual actor, which is in turn applied to the digital character, (which first has to be rigged and skinned). Again, during these processes more errors will always come up which need to be fixed, and the animators will be constantly making tweaks and adjustments.
Once the animation is actually applied to the digital character, there is still tonnes of work to be done. One of the issues with mo-cap is that animation doesn't scale... so if you apply animation to a character that has different proportions to the mo-cap actor, it won't look right. This has to be fixed by hand.
People think that the data recorded is pretty much the final product in terms of the actual animation, but in reality it's just the first building block.
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