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IK - v - FK - which is best? |
One question that often confuses student animators is "IK vs FK" - Inverse Kinematics (IK) vs Forward Kinematics (FK). The IK -v- FK debate is a bit of a techie question - it's not immediately obvious what these terms even mean, let alone how to explain which option you should choose.
IK -v- FK is really about hierarchies - usually shoulders, arms and hands. If a character's hand controls are set to IK, then you are controlling the hands from the bottom of the arm hierarchy, from the hand control. If you set the controls to FK, then upper arm, shoulder and body is in control of what the hands do.
In a walk cycle, you usually set arms and hands to FK, because the arms are swinging, controlled from the shoulders. But if you were to animate a sword fight, where the position of the hands is key, then you would likely choose IK. For a bit more visual clarity, watch the short video below.