# Rigging Info Part 2 — Biped Settings & Mirroring

https://youtu.be/D27gESe0O2M?si=xpVFy-YNBwWtuFwl

> **Summary**: After Rig Structure and FBX in Part 1, **Biped Settings** must be saved so BipedPlus Ani Utils **Reset** and **Mirror** work. Fast-Ref almost never uses this tab.

---

## 1. What Biped Settings Are

Biped Settings store extra **base Biped data** on the Rigging Info node.

| Tool | Use |
|---|---|
| Fast-Ref | Rarely used |
| BipedPlus Ani Utils | **Required** — Reset All / Mirror |

Those features need this data saved. Most other fields save automatically. The hard part is **mirror setup**.

---

## 2. Prerequisite — Local Matrix & Hierarchy

Pose Factor assumes you know **local matrix, local pose, and rotation**.

→ [3ds Max rigging | Local Matrix & Hierarchy](https://youtu.be/XRBniaqT27U)

---

## 3. How Pose Factor Mirrors

Pick a controller and mirror. It **matches a source** and the opposite side follows.

```
mirror result = controller local pose × Pose Factor
```

You can read the local values in the UI. (The English option name is **Parent**.)

Example: XYZ all `+1` copies as-is. If **Z is `-1`**, lifting `+5` on one side becomes `-5` on the other after mirror.

**Rotation Factor** and **Parent Factor** work the same way. Parent looks like a simpler rotation.

---

## 4. Why It Is Not Fully Automatic

3ds Max has Biped mirror, but a **fully automatic bone-mirror script is hard**.

Every rigger / character TA picks a different **front axis** (X vs Y) and whether **Z is flipped**. Rules differ by shop, so the practical choice was to let you set **Pose Factor / Rotation Factor**.

A BipedPlus-built rig **already has these values**. You do not need to set them by hand.

---

## 5. No Mirror · L/R · Center

To keep an extra controller (for example a sleeve) **out of mirror**, set **No Mirror** and save.

Also built in:

- **Left / Right** name rules find the opposite controller
- **Position-based** matching if names do not follow the rule
- **Center** controllers have no pair; mirror **flips left/right**
- Settings can be **exported / imported**

---

## 6. Save Update and Default Pose

Run **Save Update** to store the data.

Even if the pose has moved, **Reset** returns to the **Default Pose** stored on the Rigging Info node.

---

## In One Line

That is the whole idea. It only feels hard at first. Mirror automation is still being improved; until then, treat Factor this way.

For custom controllers (twin tails, etc.) → [Rigging Info Part 3](https://docs.otakusolutions.com/guide/common/rigging-info-03?lang=en)