Constrains one joint to follow another joint's position and rotation, with per-axis and per-channel weight control.
What it does
A plumbing component, no control built
FollowJoint builds no control. It point- and orient-constrains one joint to a source joint you pick in Properties.
Independent per-axis skip and weight sliders for translate and rotate.
It's plumbing: useful wherever a joint just needs to track another one.
When to use it
Wherever a joint should track another
Engine reference joints
UE5 joints (ik_foot_*, ik_hand_*, ik_hand_gun) that follow their rig counterparts for export.
Helpers & attachers
Helper joints, prop attachers, or any joint that should track another without a control.
Template placeholder
Leave the follow target empty and set it later, a supported no-op.
Empty target is silent
Leaving the follow target empty is silent: the joint doesn't move, no warning printed.
Missing target fails the build
A follow target that doesn't exist in the scene fails the build.
Zeroing skips the constraint
Dropping either weight to 0, or turning off all axes on one side, skips building that constraint; re-enabling it later needs a rebuild.
No control, no mirror
Not mirrorable, and it never joins the FK/IK selection sets; it has no control.