FK and IK Explained - Which One to Use and When

What is Inverse Kinematics? How and why to use it? What are the differences between FK and IK. You can find all the answers in this short explainer video. Forward and inverse kinematics are essential part of every animation and every animator should understand it. The rig I explain it on was done in 3ds Max CAT. 3ds Max CAT (Character Animation Toolkit) is an animation system inside Max that offers a lot of useful features. If you are interested in CAT and why is it (in my opinion) better then biped or re