When to use

Use this skill whenever you are working with TresJS code - a declarative Vue 3 framework for building Three.js 3D experiences. This provides comprehensive patterns, best practices, and anti-patterns for TresJS v5+.

What is TresJS?

TresJS transforms Three.js development by providing:

• Declarative Syntax - Use Vue components instead of imperative Three.js code
• Vue Reactivity - Leverage Vue's reactivity system for dynamic 3D experiences
• Better DX - TypeScript support, Vue DevTools integration, HMR
• Ecosystem - Rich collection of helpers, components, and post-processing effects

How to use

This skill includes several reference documents:

TRESJS_BEST_PRACTICES.md

Complete reference guide covering:

• Installation & Setup - Vite configuration, Nuxt integration, required packages
• Performance Optimization - shallowRef usage, render modes, tree-shaking, device pixel ratio
• Component Usage - TresCanvas props, naming conventions, template refs, the attach prop
• Composables - useLoop, useLoader, useTres, useTexture, useGLTF
• Animation Patterns - Simple animations with useLoop, complex timelines with GSAP
• Event Handling - Pointer events, canvas events, hover states
• Memory Management - Automatic disposal, manual cleanup for primitives
• Common Patterns - Scene structure, camera setup, lighting, shadows, controls
• Anti-Patterns - What NOT to do and why
• Migration Guide - v4 to v5 breaking changes and updates

CHEATSHEET.md

Quick reference for common TresJS patterns:

• Installation snippets
• Basic scene structure
• Component naming conventions
• Performance rules
• Animation examples
• Asset loading
• Event handling
• Shadows and lighting
• Controls setup
• Common gotchas

README.md

Overview of TresJS concepts with quick start guide and core concepts summary.

Key Topics

Performance:

• Always use shallowRef for Three.js objects (not ref)
• Choose appropriate render modes (always, on-demand, manual)
• Leverage tree-shaking by importing only needed components

Animation:

• Use useLoop with delta parameter for frame-rate independence
• Use GSAP for complex timelines and sequences

Common Gotchas:

• Always position cameras away from origin (default is [0,0,0])
• Use shallowRef not ref for Three.js objects
• Always use delta parameter for frame-rate independence
• Component order matters - controls must come after camera
• WebGL context props are non-reactive - set once at creation

v5 Breaking Changes:

• Event names changed: @pointer-down → @pointerdown
• useLoader returns reactive state instead of promise
• useTexture moved to @tresjs/cientos
• ESM only (no UMD)

Resources

• TresJS Documentation
• Cientos (Helpers)
• Three.js Docs