# EP06 — Full Body Weights 1 (Neck · Shoulder · Arm)

https://youtu.be/IjTvEomgTS4?si=Y_sAMlvMKIvucbIc

## 1. Neck Refinement

- With the head mesh merged, you can now fill in the **top of the Neck** with weights.
- Hierarchy: `Neck` → **Neck_Seg** + **Twist bone** (follows neck rotation).
- Twist: Flood 1.0 — name varies by rig, identify by function.
- Use **Eyedropper** to unify a loop of weights → Smooth.
- Play the animation to verify neck and twist deformation.

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## 2. Clavicle (Collarbone)

- `Clavicle_Seg` layer + Mask.

### Select Bone
- Toolbar **Select Bone** (shortcut **Q**): select a bone in the SLS viewport and use **gizmos (W=move / E=rotate / R=scale)** to temporarily pose it and check deformation.
- **The DCC rig is not affected** — this is a temporary pose in the SLS viewport only. Playback resets to the original pose.

### Fixing Poor Weld Seams
- If the armpit Weld is incomplete → switch to Vertex mode and manually select problem vertices → Set Weight / Smooth.
- Root fix: Weld thoroughly in DCC before Attach (see ep05).

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## 3. Upper Arm

1. **UpperArm_Seg** layer — Flood 1.0.
2. **Shader ▾ Gray Shaded** (key **5**) + **Screen mode** to paint generously front and back.
3. **Smooth** only the boundary edges.
4. **Mirror** (Weight + Mask).

**Shoulder interior detail:**
- For armpit/shoulder junctions: use **Multiply** brush at low value, small radius for fine adjustments.
- Use **Surface mode** to paint precisely up to back-face edges.

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## 4. Forearm

1. **ForeArm_Seg** layer.
2. After Masking, check elbow bend from the **Top view**.
3. Distribute joint-center weights with Set Weight 0.5 / 0.9, etc.
4. Use **Select Bone** to pose the elbow and adjust.

**Handling topology limitations:**
- Ideally the bone pivot aligns with an edge loop. When it doesn't, use Eyedropper + Vertex editing to get as close to natural as possible.

**Checking for leftover Root weight:**
- If Root is **not** in the Used list → all vertices are properly assigned **(good)**.
- If Root is in Used → some vertices are unassigned → clean up with Eyedropper or Set Weight.

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## 5. Mirror · Save

- Mirror is based on the bind pose — works even if the current pose is asymmetrical.
- **Ctrl+S** to save.