atlas-uv-fitting

atlas-uv-fitting is a skill for Claude Code from CheshireJCat/blender. It costs 69 tokens per session (694 once invoked), scanned A, a copy of atlas-uv-fitting, MIT.

A Blender workflow for fitting separate parts of a texture atlas—a single image containing multiple texture regions—onto the correct model surfaces.

In plain words
What is it for?
Use it to detect atlas regions, create matching UV mappings, assign front, side, and back surfaces, and prepare textured GLB exports.
Why use it?
It prevents textures from appearing stretched, misplaced, or incorrectly applied, especially when decals, lightmaps, or transparent areas are involved.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Good fit Use it to detect atlas regions, create matching UV mappings, assign front, side, and back surfaces, and prepare textured GLB exports.

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Install with agentmods
npx agentmods add skills/cheshirejcat/blender/atlas-uv-fitting
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add CheshireJCat/blender --skill atlas-uv-fitting
Clone the repo
git clone --depth 1 https://github.com/CheshireJCat/blender

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for atlas-uv-fitting

README.md
[![agentmods](https://agentmods.dev/badge/skills/cheshirejcat/blender/atlas-uv-fitting/github.svg)](https://agentmods.dev/skills/cheshirejcat/blender/atlas-uv-fitting)
Your own site
<a href="https://agentmods.dev/skills/cheshirejcat/blender/atlas-uv-fitting"><img src="https://agentmods.dev/badge/skills/cheshirejcat/blender/atlas-uv-fitting/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for atlas-uv-fitting

Your own site · 80×15
<a href="https://agentmods.dev/skills/cheshirejcat/blender/atlas-uv-fitting"><img src="https://agentmods.dev/badge/skills/cheshirejcat/blender/atlas-uv-fitting.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 69 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 694 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 98% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00069 $0.00694
Opus 5 $0.00034 $0.00347
Sonnet 5 $0.00014 $0.00139
Haiku 4.5 $0.00007 $0.00069

Measured 11d ago against content hash 77e7805c00aa, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

atlas-uv-fitting scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/atlas_region_detector.py, scripts/atlas_region_mapper.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

98% identical to atlas-uv-fitting — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/create-3d-model/references/modules/atlas-uv-fitting/SKILL.md · 59 lines

How it starts

The opening of the file, as written. The whole thing — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Atlas UV Fitting

This skill exists because assigning a texture material is not the same as fitting a texture.

Supplemental map sanity rule

Do not blindly wire emissive/roughness/bump/lightmap images into every atlas-mapped part. First verify the supplemental map has the same UV layout and semantic region as the basecolor. If it contains aura dots, guide marks, lightmap blobs, or decorations outside the part, leave it disconnected for that mesh and use constant roughness/bump plus explicit edge/glow geometry instead.

Hard rules

  • Atlas textures must be mapped by region; never apply the full atlas to every structural mesh.
  • Front-facing hero surfaces use front-projected UVs or a source-region rectangle.
  • Side/back surfaces use their own UV islands or procedural/baked fills.
  • Roughness, bump, normal, AO, and lightmap images are Non-Color.
  • Alpha decals must use alpha-connected materials and no black backing planes.
  • Base GLB should not include reference planes or optional aura unless explicitly requested.

Workflow

  1. Run scripts/atlas_region_detector.py on basecolor/decal/aura atlases.
  2. Name regions semantically in atlas_regions.json.
  3. Create/activate UV map per mesh.
  4. Remap local 0-1 UVs into the matching atlas rectangle.
  5. Audit the GLB/export material node graph: Principled BSDF + Image Texture nodes.
  6. Render texture overlay validation before export.

Sources distilled

  • Blender UV/Image Texture node uses UV maps for rendered/exported texture output.
  • Blender baking needs UV maps and active image targets.
  • Blender glTF exporter is most reliable with Principled BSDF, UVs, textures, normals.
  • Khronos glTF PBR: base color, metallic/roughness, normal maps are standard channels.

Semantic atlas mapping

Region detection is only a candidate list. For source-locked work, create an atlas_part_map.json that binds each structural part name to exactly one atlas region or declares procedural/no_texture.

Mapping order:

  1. Detect candidate regions from basecolor/decal/lightmap.
  2. Reject decorative/aura/composite-preview regions unless the target is context/aura.
  3. Match structural parts by role, aspect ratio, and relative size.
  4. Manually rename ambiguous regions before automated UV assignment.
  5. Verify supplemental maps share the same region layout before connecting roughness/bump/emission/lightmap.

Read the full file on GitHub · 59 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 11d ago First seen · 59 lines · 69 tokens per session scan A 77e7805c00aa

Subscribe to this mod's changes

atlas-uv-fitting is a skill published in the GitHub repository CheshireJCat/blender (26 stars, last pushed 22d ago), licensed MIT. It adds 69 tokens to every session and 694 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 98% identical to atlas-uv-fitting, differing in 2 lines, and is treated as a copy.

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