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In rigging, FORWARD KINEMATICS (FK) and INVERSE KINEMATICS (IK) differ in which essential way?
AFK is GPU-only; IK is CPU-only by definition
BFK is deterministic; IK uses random sampling always
CFK works only on 2D rigs; IK only on 3D rigs
DFK poses joints down the chain; IK solves joints from a goal
Answer & Solution
Correct answer: D. FK poses joints down the chain; IK solves joints from a goal
Standard rigging: FK = rotate each parent joint in turn (forward). IK = given a target (e.g. foot on ground), solve joint angles to reach it.
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