This takes the nearest vertices on the model and connects them to the joints. Often times however it is not perfect. Certain joints will have influence in odd places and make the model look awkward. This is most prominent in the jaw, as the inside of the mouth is quite complex, the jaw controller simply stretches the face where we want it to open the mouth.
To fix these issues, I have to go in and paint the weights. This allows me select what areas of the mesh are affected by what joints. For the jaw i had to get rid of influence on the top and roof of the mouth to get it to open. I also had to paint weights on other limbs so that they moved in a clean fashion.
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