3D Image Renderer

What it does

When your agent uses it

• The user asks to generate
• Render an image
• Thumbnail background
• Product shot with this system — especially with phrases like generate an image of

Example prompts

• “generate an image of”
• “render a scene”
• “create a PNG”
• “/3d-image-renderer”

Requirements

• Node.js
• A Bash shell

Workflow steps

6 steps, taken from the step headings in SKILL.md.

1. 1Setup
2. 2Plan the scene
3. 3Write the scene
4. 4Render
5. 5Validate (mandatory — never skip)
6. 6Deliver

What it can do on your machine

Read from SKILL.md and the folder at commit f533831. 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 and Shell), which the agent can run.

  Shell commands in SKILL.md call:

  • bash
  • 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

3D Image Renderer loads about 1.4k tokens when it runs, and up to ~4.1k if it reads all its reference files. Until then it costs about 192 tokens; SKILL.md has 514 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~192

When it runs · the whole SKILL.md, loaded when a task matches

~1.4k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~4.1k

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

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 hassancs91/claude-image-generation at commit f533831, republished under its MIT licence (© hassancs91). 514 words, ~1,377 tokens.

name

3d-image-renderer

description

Generate PNG images by building a real Three.js 3D scene and capturing one frame headlessly — no image model involved. Takes a text prompt and an aspect ratio (1:1, 16:9, or 9:16) and produces a rendered PNG. Use this skill whenever the user asks to generate, create, or render an image, picture, scene, wallpaper, thumbnail background, or product shot with this system — especially with phrases like "generate an image of", "render a scene", "create a PNG", "no image model", "3D render of", or a prompt paired with an aspect ratio. Also use it when the user wants an image in a named visual style (dark studio, Apple light, nature, sunset, night, underwater). Not for editing existing images, 2D vector art, or animated video (VidTSX handles video).

bash <skill_dir>/scripts/setup.sh

import {
  THREE, createRenderer, captureFrame, addStudioEnvironment,
  seededRandom, visibleHeightAt,
} from './pipeline.mjs';

const time = 2.0; // the captured "frame"
const { renderer, glContext, W, H, OUT_W, OUT_H } =
  createRenderer('16:9', { exposure: 1.15 /* from style preset */ });

const scene = new THREE.Scene();
// ... build: sky, lights, ground, hero elements (per preset + recipes) ...

await captureFrame({
  renderer, glContext, scene, camera, W, H, OUT_W, OUT_H,
  outPath: '/home/claude/scene-render/out.png',
});
console.log('DONE');

cd /home/claude/scene-render && xvfb-run -a node scene.mjs

node validate.mjs out.png heroes.json

[
  { "name": "flowers", "hex": "f5a8c8", "tolerance": 45, "minPct": 0.3 },
  { "name": "tree canopy", "hex": "5a9440", "tolerance": 60, "minPct": 2.0 }
]

cp /home/claude/scene-render/out.png "/mnt/user-data/outputs/<descriptive_name>.png"

© hassancs91, MIT. 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, assets) in .claude/skills/level-2-image-generator of hassancs91/claude-image-generation.

• SKILL.md
• assets/webgl-abi127-linux-x64.node
• references/geometry-recipes.md
• references/style-presets.md
• scripts/lib/pipeline.mjs
• scripts/setup.sh
• scripts/validate.mjs

Open the folder on GitHubat commit f533831