IK Rigs & Retargeting

Blueprint AI authors both halves of the IK Rig toolset: the IK Rig (solvers, goals, and retarget chains over a skeleton) and the IK Retargeter that copies animation from one skeleton onto another.

Note

This is a conditional domain — available when the engine’s IKRig plugin is enabled (it is by default).

IK Rigs

The skeletal mesh must be assigned first — it loads the bone hierarchy every other step references.

Create an IK Rig called IK_Mannequin in /Game/Characters and assign SK_Mannequin as its skeletal mesh Add a Full Body IK solver to IK_Mannequin Add goals Hand_L at the hand_l bone and Foot_R at the foot_r bone, connected to the solver Add a retarget chain LeftArm spanning upperarm_l to hand_l, and set the retarget root to the pelvis bone Describe the IK rig IK_Mannequin

IK Retargeters

Create an IK Retargeter called RTG_ManToMonster in /Game/Characters Set its source IK Rig to IK_Mannequin and its target IK Rig to IK_Monster Add the default retarget-op stack and auto-map the chains using fuzzy matching Map the source chain Spine onto the target chain MonsterSpine Describe the retargeter RTG_ManToMonster

Tip

Solvers are added by type — Full Body IK, Limb, Pole, or Body Mover. Just name the solver you want and Blueprint AI resolves the struct path for you.