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threejs-animation · calesthio — Claude Code skill: animation and setup

This skill helps an agent build Three.js motion with keyframes, bones, morph targets, and clip blending. Use it for procedural motion or GLTF playback.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓ 
npx skills add calesthio/OpenMontage --skill threejs-animation -a claude-code
Open on GitHub

What threejs-animation does

threejs-animation covers the Three.js animation model built around AnimationClip, AnimationMixer, and AnimationAction. It includes procedural movement and keyframe tracks for numbers, vectors, quaternions, colors, visibility, and morph targets. Playback examples cover starting, stopping, pausing, timing, weights, loop modes, clamping, and transitions between clips.

The material shows how to load GLTF animations with GLTFLoader, find a clip by name, and update a mixer inside the render loop. It also covers skeleton inspection, bone changes, SkeletonHelper, and attaching an object to a bone. The examples use three; GLTF scenes use GLTFLoader.

mixer.update(delta) is required inside the animation loop for a clip to advance. Check that part of the render loop before tuning an action or a blend.

What it helps with

  • play an animation from a GLTF file
  • build object motion from keyframe tracks
  • crossfade between two animation clips
  • inspect bones and attach an object to a skeleton
  • create procedural mesh movement

Example prompts for the agent

  • Use the `threejs-animation` skill to add procedural object motion with `AnimationMixer`.
  • With `threejs-animation`, load `model.glb`, find the `Walk` clip, and play it in the render loop.
  • Explain how to use `AnimationAction` for a smooth transition between two Three.js animations.

How to install threejs-animation

1Skills CLI (Vercel)

npx skills add calesthio/OpenMontage --skill threejs-animation -a claude-code

2Manually: put the files in place

~/.claude/skills/threejs-animation/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/threejs-animation/

From the same set28

The whole set →
video-understand calesthio This skill extracts video frames and transcribes audio locally with ffmpeg and Whisper. Use it to inspect video content without API keys. Claude Code CX Codex Cursor +1 1,300installs remotion calesthio Teaches AI agents toolkit-specific Remotion patterns, including custom transition shaders and 30 fps video rules. Claude Code CX Codex Cursor +1 1,200installs video-download calesthio Uses yt-dlp to fetch video, audio, subtitles, or URL metadata. Use it when you need a local file, a selected resolution, or details without downloading media. Claude Code CX Codex Cursor +1 1,200installs lottie-bodymovin calesthio Applies Disney's 12 animation principles to Lottie vector animations. Bridges After Effects setup with runtime JavaScript controls. Claude Code CX Codex Cursor +1 1,100installs create-video calesthio This skill turns a description into a finished video: write what you want to see, and HeyGen generates the script, picks an avatar, adds voiceover and editing. Good for quick demos, explainers and promos without tweaking every detail. Claude Code CX Codex Cursor +1 1,100installs video-toolkit calesthio Automates video creation: generates voiceovers, background music, animates talking heads, and composes scenes with Remotion. Requires Node.js, Python3, ffmpeg, and cloud GPU access (Modal or RunPod). Claude Code CX Codex Cursor +1 1,100installs text-to-speech calesthio Generates speech audio with HeyGen Starfish and lets you choose a voice, speed, and pitch. Useful for voiceovers, narration, and podcasts. Claude Code CX Codex Cursor +1 1,100installs bfl-api Black Forest Labs This skill helps connect BFL FLUX API for image generation and editing. It covers async requests, polling, rate limits, and webhooks. Claude Code CX Codex Cursor +1 1,000installs

Other versions of threejs-animation

threejs-animation CloudAI-X Skill for keyframe, skeletal and morph-target animation in Three.js. Play glTF animations, control bones, blend and crossfade clips on WebGL and WebGPU. Claude Code CX Codex Cursor +1 20,100installs

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Questions about threejs-animation

How do I install `threejs-animation` in Claude Code?

Run npx skills add calesthio/OpenMontage --skill threejs-animation -a claude-code, then run npx skills add calesthio/OpenMontage --skill threejs-animation -a claude-code again and check ~/.claude/skills/threejs-animation/SKILL.md.

What does `threejs-animation` do?

The skill helps with Three.js animation work, including keyframes, procedural motion, GLTF clips, skeletal animation, and blending actions.

What is required for a clip to keep playing?

After creating an AnimationMixer, update it with mixer.update(delta) inside the animation loop. GLTF loading uses GLTFLoader.

See also

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