# reference-analysis-validator

The skill measures reference images and Blender renders and blocks a 1:1 claim until the metrics pass.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 826 installs · ★ 125
- Author: RobLe3
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/RobLe3/cc-blender-skill/tree/HEAD/plugin/skills/reference-analysis-validator/SKILL.md
- Updated: 2026-10-12
- HTML: https://affpapa.org/en/nevibecode/skills/reference-analysis-validator

## What it does

This skill turns "looks close" into measurable gates. It classifies sources — front, side, back, top, texture atlas, decals, maps, lightmap, aura, context — and builds `reference_manifest.json` with hard expected part counts and view roles. Masks and components are extracted from each source, then the model is rendered from a matching orthographic camera with reference planes hidden.

Comparison runs through `scripts/render_overlay_validator.py`: IoU, SSIM, centroid and bbox drift, plus landmark drift for face, eyes and smile. Default gates: exact structural part count, front silhouette IoU at or above 0.90 for rigid and logotype shapes, 0.82 for a first mascot pass, bbox center drift within 12 px at 1024 px validation size, bbox size drift within 3% of image dimension, landmark drift within 2%. If hard gates fail, final export is refused.

One catch: compare like with like. A wireframe edge mask against a shaded beauty render gives a misleadingly low IoU, so for hard gates render a flat silhouette or matte pass, and use `render_overlay_validator.py --reference-mode ... --render-mode ...` when source and render need different extraction modes. Before the first Blender call, read `../text-to-blender/references/mcp-backends.md` and pick an MCP backend — official is preferred for shared capabilities, but the chosen one stays for the whole task.

## Requirements
- Works with: Blender

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add RobLe3/cc-blender-skill --skill reference-analysis-validator -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/reference-analysis-validator/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/reference-analysis-validator/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add RobLe3/cc-blender-skill --skill reference-analysis-validator -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/reference-analysis-validator/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add RobLe3/cc-blender-skill --skill reference-analysis-validator -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/reference-analysis-validator/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install RobLe3/cc-blender-skill reference-analysis-validator
```

2. **Manually: put the files in place**
- File: `.github/skills/reference-analysis-validator/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add RobLe3/cc-blender-skill --skill reference-analysis-validator -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/RobLe3/cc-blender-skill --path plugin/skills/reference-analysis-validator
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/reference-analysis-validator/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add RobLe3/cc-blender-skill --skill reference-analysis-validator -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/RobLe3/cc-blender-skill/tree/HEAD/plugin/skills/reference-analysis-validator/SKILL.md

## When to use it
- build a source manifest with expected part counts
- measure IoU and SSIM between reference and render
- catch centroid and bbox drift before export
- compare wireframe masks against a render silhouette in one mode
- refuse export until hard gates pass

## Example prompts
- check the references and build reference_manifest.json before modeling
- compare the reference mask with the render using render_overlay_validator.py
- compute front silhouette IoU and show the report

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 4c3b52253f3b7300.

BEGIN THIRD-PARTY FILE 4c3b52253f3b7300
```text
---
name: reference-analysis-validator
description: Measure and validate supplied reference images, wireframes, texture atlases, and Blender renders before declaring a reconstruction 1:1. Use when an asset must match a template, when visual feedback says the output is off, when part counts must be exact, or before exporting a brand mascot/logo reconstruction. Pairs with reference-to-3d, contour-to-mesh, orthographic-registration, atlas-uv-fitting, and Blender MCP.
allowed-tools: Read Bash Glob Grep mcp__blender__execute_blender_code mcp__blender__get_scene_info mcp__blender__get_object_info mcp__blender__get_objects_summary mcp__blender__get_object_detail_summary mcp__blender__render_viewport_to_path mcp__blender__search_api_docs mcp__blender_official__execute_blender_code mcp__blender_official__get_objects_summary mcp__blender_official__get_object_detail_summary mcp__blender_official__render_viewport_to_path mcp__blender_official__search_api_docs
---


## MCP backend

Use when: Any 1:1 reference/model validation task involving masks, overlays, part counts, centroids, bounding boxes, SSIM/IoU, source manifests, or fail-before-export gates.

Before the first Blender call, read [../text-to-blender/references/mcp-backends.md](../text-to-blender/references/mcp-backends.md). Prefer official MCP for shared capabilities; preserve the selected backend for the whole task. Tool names in recipes are client/legacy examples: map them through that reference and its agent-host guide.
# Reference Analysis Validator

This skill converts “looks close” into measurable gates. For brand/logo/mascot work, **do not model or export until a source manifest and validation thresholds exist**.

## Required outputs

Create these in the asset output folder:

- `reference_manifest.json` — classified source files, expected parts, thresholds.
- `source_analysis/*.json` — image metadata, masks/components/landmarks.
- `validation/front_overlay_reference.png` — reference and render overlay.
- `validation/front_mask_validation.json` — IoU/SSIM/bbox/centroid report.

## Workflow
```
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First 2090 of 4075 bytes. © RobLe3 · MIT · https://github.com/RobLe3/cc-blender-skill/tree/HEAD/plugin/skills/reference-analysis-validator/SKILL.md

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---
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