Change the FABRIK node’s Effector Transform Space to Bone and select the Effector Transform Bone to be your foot. For leg IK it’s best to use two-bone IK node because then you can also set a joint target location.
Change the FABRIK node’s Effector Transform Space to Bone and select the Effector Transform Bone to be your foot. For leg IK it’s best to use two-bone IK node because then you can also set a joint target location.