# What goes wrong with inverted-hull outlines in production (width vs distance and FOV, hard edges, custom normals, floating lines, fabric) and what fixes did a studio document?

- id: art_01M5MVCK1WVNA6SMDKE35YB3ER
- 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, T15, T18 · tags: none
- updated: 2026-10-23T17:01:57.174Z
- url: https://veyrul.com/articles/art_01M5MVCK1WVNA6SMDKE35YB3ER

The ASW English deck (published 2025-11-28; 79 slides) lists concrete failure modes and fixes for the hull: scale width with camera distance and FOV (tan(FOV/2) factor, FOV from the projection matrix), control width with a vertex-colour channel (default 0.5), push the back-face mesh away from the camera to keep only the outer rim, use a second normal set for the hull when hard edges or customised normals break it (stored in the tangent channel at import), and set the width to 0 in valleys to close gaps that make lines float. Unity Toon Shader exposes parallel controls (width map, Z offset, distance fade, baked normal map for outlines). The deck says it avoids code and is engine-independent; the second-normal-in-tangent approach needs an engine import change.

The ASW English deck (published 2025-11-28; 79 slides) lists concrete failure modes and fixes for the hull: scale width with camera distance and FOV (tan(FOV/2) factor, FOV from the projection matrix), control width with a vertex-colour channel (default 0.5), push the back-face mesh away from the camera to keep only the outer rim, use a second normal set for the hull when hard edges or customised normals break it (stored in the tangent channel at import), and set the width to 0 in valleys to close gaps that make lines float. Unity Toon Shader exposes parallel controls (width map, Z offset, distance fade, baked normal map for outlines). The deck says it avoids code and is engine-independent; the second-normal-in-tangent approach needs an engine import change.

Curator qualifications: Hull failure modes and fixes: scale width with distance and FOV, vertex-colour width control, and others.

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

```json
{
  "citations": [
    {
      "url": "https://www.docswell.com/s/ASW_Academy/5LVY67-GG-Toonline-Eng",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://github.com/Unity-Technologies/com.unity.toonshader/blob/f50ef3579824272907ff603cf97e2edaeb81f20b/com.unity.toonshader/Documentation~/Outline.md",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://www.ggxrd.com/Motomura_Junya_GuiltyGearXrd.pdf",
      "note": "candidate evidence excerpts"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] The ASW English deck (published 2025-11-28; 79 slides) lists concrete failure modes and fixes for the hull: scale width with camera distance and FOV (tan(FOV/2) factor, FOV from the projection matrix), control width with a vertex-colour channel (default 0.5), push the back-face mesh away from the camera to keep only the outer rim, use a second normal set for the hull when hard edges or customised normals break it (stored in the tangent channel at import), and set the width to 0 in valleys to close gaps that make lines float. Unity Toon Shader exposes parallel controls (width map, Z offset, distance fade, baked normal map for outlines). The deck says it avoids code and is engine-independent; the second-normal-in-tangent approach needs an engine import change. · locator: candidate evidence excerpts · source: https://www.docswell.com/s/ASW_Academy/5LVY67-GG-Toonline-Eng

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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