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Agent skill

Threejs

by benchflow-ai in benchflow-ai/skillsbench

Three.js scene-graph parsing and export workflows: mesh baking, InstancedMesh expansion, part partitioning, per-link OBJ export, and URDF articulation.

Apache-2.0Auto-check passedGame Development

Install Threejs

skills CLI
$ npx skills add benchflow-ai/skillsbench --skill threejs -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install benchflow-ai/skillsbench threejs --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/benchflow-ai/skillsbench.git skills-src && mkdir -p .claude/skills && cp -r skills-src/tasks/threejs-to-obj/environment/skills/threejs .claude/skills/threejs && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
threejs
GitHub stars
1.8k
Token cost
~807 tokens
SKILL.md length
215 words
Files
7 (incl. scripts, references)
Skills in repo
180
Repo updated
First seen
Licence
Apache-2.0

At a glance

Three.js scene-graph parsing and export workflows: mesh baking, InstancedMesh expansion, part partitioning, per-link OBJ export, and URDF articulation.

  • Works in 5 steps: Load the module, call createScene(),… → Treat named THREE.Group nodes as… → Assign each mesh to its nearest named… → …
  • Tasks that involve 3D graphics and WebGL
  • SKILL.md covers Quick start, Scene graph essentials, Part partitioning rules and Mesh baking (world transforms), plus 3 more sections
  • Runs JavaScript scripts from its folder; calls node

What it does

Threejs is an agent skill from benchflow-ai/skillsbench. Three.js scene-graph parsing and export workflows: mesh baking, InstancedMesh expansion, part partitioning, per-link OBJ export, and URDF articulation.

Its SKILL.md is about 810 tokens, which your agent loads only when the skill is triggered. The skill folder holds 8 other files, including scripts and reference files (for example `references/joint-type-heuristics.md`, `references/link-export-rules.md` and `references/urdf-minimal.md`).

It sits in Game Development, covering 3D graphics and WebGL. It works with Three.js. The repository describes itself as: SkillsBench evaluates how well skills work and how effective agents are at using them. The licence is Apache-2.0.

When your agent uses it

  • Tasks that involve 3D graphics and WebGL

Example prompts

  • “/threejs”

Requirements

  • Node.js

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Load the module, call createScene(), then updateMatrixWorld(true).
  2. Treat named THREE.Group nodes as parts/links.
  3. Assign each mesh to its nearest named ancestor.
  4. Bake world transforms into geometry before export.
  5. Export per-part OBJ (and optionally URDF) using deterministic ordering.

What it can do on your machine

Read from SKILL.md and the folder at commit 9a1f4dd. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 3 files in scripts/ (JavaScript), which the agent can run.

    Shell commands in SKILL.md call:

    • node

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Threejs loads about 807 tokens when it runs, and up to ~1.4k if it reads all its reference files. Until then it costs about 40 tokens; SKILL.md has 215 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~40
When it runs · the whole SKILL.md, loaded when a task matches
~807
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from benchflow-ai/skillsbench at commit 9a1f4dd, republished under its Apache-2.0 licence (© benchflow-ai). 215 words, ~807 tokens.

Download SKILL.mdSave it as .claude/skills/threejs/SKILL.md (or your agent's skills folder). This skill also uses 6 other files; get the full folder from GitHub.
name
threejs
description
Three.js scene-graph parsing and export workflows: mesh baking, InstancedMesh expansion, part partitioning, per-link OBJ export, and URDF articulation.

Three.js Scene Graph + Export

Quick start

  1. Load the module, call createScene(), then updateMatrixWorld(true).
  2. Treat named THREE.Group nodes as parts/links.
  3. Assign each mesh to its nearest named ancestor.
  4. Bake world transforms into geometry before export.
  5. Export per-part OBJ (and optionally URDF) using deterministic ordering.

Scene graph essentials

Object3D (root)
├── Group (part)
│   ├── Mesh
│   └── Group (child part)
│       └── Mesh
└── Group (another part)
    └── Mesh
  • THREE.Scene / THREE.Object3D: containers
  • THREE.Group: logical part (no geometry)
  • THREE.Mesh: geometry + material

Part partitioning rules

  • Parts are named groups at any depth.
  • Each mesh belongs to the nearest named ancestor.
  • Nested named groups are separate parts; do not merge their meshes into parents.
  • Skip empty parts; sort part names for determinism.
javascript
function buildPartMap(root) {
  const parts = new Map();
  root.traverse((obj) => {
    if (obj.isGroup && obj.name) parts.set(obj.name, { group: obj, meshes: [] });
  });
  root.traverse((obj) => {
    if (!obj.isMesh) return;
    let parent = obj.parent;
    while (parent && !(parent.isGroup && parent.name)) parent = parent.parent;
    if (parent && parts.has(parent.name)) parts.get(parent.name).meshes.push(obj);
  });
  return Array.from(parts.values()).filter((p) => p.meshes.length > 0);
}

Mesh baking (world transforms)

Always bake transforms before export:

javascript
root.updateMatrixWorld(true);
let geom = mesh.geometry.clone();
geom.applyMatrix4(mesh.matrixWorld);
if (geom.index) geom = geom.toNonIndexed();
if (!geom.attributes.normal) geom.computeVertexNormals();
InstancedMesh expansion
javascript
const tempMatrix = new THREE.Matrix4();
const instanceMatrix = new THREE.Matrix4();
obj.getMatrixAt(i, instanceMatrix);
tempMatrix.copy(obj.matrixWorld).multiply(instanceMatrix);
Axis conversion (Y-up to Z-up)
javascript
const axisMatrix = new THREE.Matrix4().makeRotationX(-Math.PI / 2);
geom.applyMatrix4(axisMatrix);

Per-part OBJ export

  • Collect meshes owned by each part.
  • Do not traverse into child named groups when exporting a part.
  • Merge baked geometries per part and write <part>.obj.

Reference: references/link-export-rules.md.

Relation between Three.js and URDF articulation

  • Use named groups as links.
  • Parent is the nearest named ancestor link.
  • Joint type defaults to fixed unless evidence suggests revolute/prismatic.
  • Sort link and joint names for determinism.

References:

  • references/joint-type-heuristics.md
  • references/urdf-minimal.md

Scripts

  • InstancedMesh OBJ exporter: node scripts/export_instanced_obj.mjs
  • Per-link OBJ exporter: node scripts/export_link_objs.mjs --input <scene_js> --out-dir <dir>
  • URDF builder: node scripts/build_urdf_from_scene.mjs --input <scene_js> --output <file.urdf> --mesh-dir <mesh_dir>

Adjust inputs/outputs inside scripts as needed.

© benchflow-ai, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 6 other files (scripts, references) in tasks/threejs-to-obj/environment/skills/threejs of benchflow-ai/skillsbench.

  • SKILL.md
  • references/joint-type-heuristics.md
  • references/link-export-rules.md
  • references/urdf-minimal.md
  • scripts/build_urdf_from_scene.mjs
  • scripts/export_instanced_obj.mjs
  • scripts/export_link_objs.mjs

Open the folder on GitHubat commit 9a1f4dd

Compare with similar skills

Threejs next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Threejs compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Threejs this skillbenchflow-ai/skillsbench1.8k—~807Automated safety check: PassApache-2.0
Image to Three.js Modelimg2threejs/img2threejs18k1 repos~8.2kAutomated safety check: PassApache-2.0
Web CloneJane-xiaoer/claude-skill-web-clone1k1 repos~2.7kAutomated safety check: PassMIT
Threejs Game Directormajidmanzarpour/threejs-game-skills2.4k—~2.2kAutomated safety check: PassMIT
Threejs Gameplay Systemsvalkor-ai/loom1.2k1 repos~1.4kAutomated safety check: PassApache-2.0
Threejs World Generationcalesthio/OpenMontage65k—~2kAutomated safety check: PassAGPL-3.0

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Works with

Categories

Questions about Threejs

What does Threejs do?

Three.js scene-graph parsing and export workflows: mesh baking, InstancedMesh expansion, part partitioning, per-link OBJ export, and URDF articulation. Threejs is an agent skill from benchflow-ai/skillsbench.js scene-graph parsing and export workflows: mesh baking, InstancedMesh expansion, part partitioning, per-link OBJ export, and URDF articulation.

When should I use Threejs?

Threejs fits situations like: tasks that involve 3D graphics and WebGL.

How do I install Threejs in Claude Code?

Run `npx skills add benchflow-ai/skillsbench --skill threejs -a claude-code`. Or copy the skill folder (tasks/threejs-to-obj/environment/skills/threejs in benchflow-ai/skillsbench) into .claude/skills/threejs in your project. Claude Code loads it when a task matches its description.

How do I install Threejs in Codex?

Run `npx skills add benchflow-ai/skillsbench --skill threejs -a codex`. Or copy the skill folder (tasks/threejs-to-obj/environment/skills/threejs in benchflow-ai/skillsbench) into .agents/skills/threejs in your project. Codex loads it when a task matches its description.

Can I use Threejs in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add benchflow-ai/skillsbench --skill threejs -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/threejs, .gemini/skills/threejs, .github/skills/threejs and .opencode/skills/threejs in your project.

What does Threejs need to run?

Going by SKILL.md and its folder, Threejs needs JavaScript for the scripts in its folder and the command-line tools its instructions call (node). Our summary lists: Node.js.

Does Threejs access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Threejs safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Threejs use?

Threejs is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Threejs use?

About 807 tokens (SKILL.md is roughly 3.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 610 tokens, read only when the agent opens those files.

What are the alternatives to Threejs?

Skills that share tags, products or a category with Threejs: Image to Three.js Model (img2threejs/img2threejs, 18k stars), Web Clone (Jane-xiaoer/claude-skill-web-clone, 1k stars), Threejs Game Director (majidmanzarpour/threejs-game-skills, 2.4k stars) and Threejs Gameplay Systems (valkor-ai/loom, 1.2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Threejs?

benchflow-ai (a GitHub organization) maintains it in benchflow-ai/skillsbench, which has 1,832 GitHub stars. The repository holds 180 skills in this directory. The repository was last updated on July 23, 2026.

Source: benchflow-ai/skillsbench on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.