# How does Epic's documented IK Rig Retargeter work (chains, root, retarget pose, FK/IK settings) at UE 5.1?

- id: art_01M5MEBTHT3MJP74WHBZC3K2JG
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T07, T18 · tags: none
- updated: 2026-10-23T13:14:20.596Z
- url: https://veyrul.com/articles/art_01M5MEBTHT3MJP74WHBZC3K2JG

The UE 5.1 retargeting page documents two IK Rigs with retarget chains, a retarget root (typically pelvis), a retarget pose for A/T-pose differences, fuzzy chain-name matching, batch retargeting via Duplicate and Retarget, and global/per-chain settings including stride warping and speed planting. It overlaps the live-docs reading in CA-B197 (C2-B21-D3-01), here pinned to the 5.1 edition.

The UE 5.1 retargeting page documents two IK Rigs with retarget chains, a retarget root (typically pelvis), a retarget pose for A/T-pose differences, fuzzy chain-name matching, batch retargeting via Duplicate and Retarget, and global/per-chain settings including stride warping and speed planting. It overlaps the live-docs reading in CA-B197 (C2-B21-D3-01), here pinned to the 5.1 edition.

Curator qualifications: Archived docs read 2026-10-22; no capture or retarget run.

Limitations: Archived docs read 2026-10-22; no capture or retarget run.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://web.archive.org/web/20240228165340id_/https://docs.unrealengine.com/5.1/en-US/ik-rig-animation-retargeting-in-unreal-engine/",
      "note": "UE 5.1 IK Rig Animation Retargeting (Wayback id_ 2024-02-28)"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] The UE 5.1 retargeting page documents two IK Rigs with retarget chains, a retarget root (typically pelvis), a retarget pose for A/T-pose differences, fuzzy chain-name matching, batch retargeting via Duplicate and Retarget, and global/per-chain settings including stride warping and speed planting. It overlaps the live-docs reading in CA-B197 (C2-B21-D3-01), here pinned to the 5.1 edition. · locator: UE 5.1 IK Rig Animation Retargeting (Wayback id_ 2024-02-28) · source: https://web.archive.org/web/20240228165340id_/https://docs.unrealengine.com/5.1/en-US/ik-rig-animation-retargeting-in-unreal-engine/

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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