As we started to animate our models the easiest way to animate is by following our real life movements. Most often than not our human bodies can walk like the character we make if it is bipedal. I recored two videos of myself doing a slight crab walk, this is how I imagine my character to move, slightly hunched back on bent knees and in a kind of alert stance.
Pretty much the same as image planes in Maya I just created video planes and move my character in time with the video of myself, this helps to get the timing right and also get the parts of the body in the right place at the right time.
This method is used pretty much in all professional animation companies, we saw an example of this at BAF 2010 with the game Enslaved produced by NinjaTheory, they used Andy Serkis using a motion capture suit. Essentially its the same as taking video of actions and animating from them.
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