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.
npx skills add OpenLAIR/OpenSkill --skill evo-threejs-obj-exportgit clone --depth 1 https://github.com/OpenLAIR/OpenSkillWrote 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.
[](https://agentmods.dev/skills/openlair/openskill/evo-threejs-obj-export)<a href="https://agentmods.dev/skills/openlair/openskill/evo-threejs-obj-export"><img src="https://agentmods.dev/badge/skills/openlair/openskill/evo-threejs-obj-export/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.
<a href="https://agentmods.dev/skills/openlair/openskill/evo-threejs-obj-export"><img src="https://agentmods.dev/badge/skills/openlair/openskill/evo-threejs-obj-export.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00077 | $0.00692 |
| Opus 5.5 | $0.00031 | $0.00277 |
| Sonnet 5.5 | $0.00015 | $0.00138 |
| Haiku 4.5 | $0.00008 | $0.00069 |
Grade A, and why
evo-threejs-obj-export 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 1mo ago.
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.
How it starts
The opening of the file, as written. The whole thing — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.
evo-threejs-obj-export
Purpose
Convert Three.js scene definitions (ES module files exporting geometry constructors) into Wavefront OBJ files suitable for import into Blender (Z-up coordinate system).
Key Concepts
Pipeline Steps
- Dynamic Import: Load the Three.js object definition file using
await import(filePath) - Scene Construction: Call the exported function (e.g.,
createScene()) to get the 3D object hierarchy - Coordinate Transform: Apply +90° (Math.PI/2) X-rotation to convert Y-up (Three.js) to Z-up (Blender)
- Matrix Baking: Call
scene.updateMatrixWorld(true)— CRITICAL in headless Node.js (no renderer to auto-update) - OBJ Export: Use
OBJExporter.parse(scene)to serialize to OBJ string - File I/O: Write the OBJ string to disk with
fs.writeFileSync
Critical Details
- Three.js v0.175.0 is an ES Module — requires
"type": "module"in package.json - Import Three.js:
import * as THREE from 'three' - Import OBJExporter:
import { OBJExporter } from 'three/addons/exporters/OBJExporter.js' - The rotation is applied to a wrapper Group containing the imported object, NOT to individual geometries
updateMatrixWorld(true)must be called AFTER setting rotation but BEFORE parsing- The OBJExporter reads
.matrixWorldduring traversal — without explicit update, transforms are ignored - Object.js files may export named functions like
createScene()— check module exports dynamically
Coordinate Transform Math
Rotation matrix Rx(-π/2) maps:
- Y-up → Z-up: (x, y, z) → (x, z, -y)
- This is the standard Three.js-to-Blender conversion
Utility Functions
generate_export_script(inputPath, outputPath)
Generates the content of a Node.js ES module script as a string.
Usage from Node.js:
import { generate_export_script } from './scripts/generate_export_script.mjs';
const scriptContent = generate_export_script('/root/data/object.js', '/root/output/object.obj');
create_obj_export_node_script(inputPath, outputPath, scriptOutputPath)
Generates AND writes the export script to disk, then optionally executes it.
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.
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.
- 1mo ago First seen · 60 lines · 77 tokens per session scan A 9e4f989c7c6b
evo-threejs-obj-export is a skill published in the GitHub repository OpenLAIR/OpenSkill (97 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 77 tokens to every session and 692 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-11.
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