Tuesday, September 10, 2013

breaking the joint

in animation, the breaking of a jointed limb is key to showing force travel through the limb.
when an object such as an arm moves through space, the limbs attached below will drag behind until the primary limb has either slowed down, stopped or changed direction. when this occurs, the lower limb will keep moving due to the momentum built up by the primary limb. as the limb swings past the centre line of the primary limb the joint has been broken.

going to the life action ref, you notice the drag occuring in the 2ndary limb (blue) by the straightening out of the arm. Although the movement is slight, this straightening out is what gives the arm its flexibiltiy and ability to generate force through it. as the arm reaches its extreme fwd movement it slows down and the secondary limb to catches up with it. the movement is slight and appears stiff when it is copied.

studying the swing of a human arm you will notice that there is not the xtreme joint breaking as depicted in animations. but its is still important to examine real life movement and see where the oppurtunity for joint breaking can occur.
take that breakdown drawing of the arm mid swing, what if we drag that secondary limb so it passes the upper arms cog, thus "breaking" the joint.
 when we jump to the extreme forward position we feel  the force more clearly being exerted through the arm.
the arm swing now feels more loose and flexible.

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