threejs-skills

Three.js Skills

Systematically create high-quality 3D scenes and interactive experiences using Three.js best practices.

When to Use

• Requests 3D visualizations or graphics ("create a 3D model", "show in 3D")
• Wants interactive 3D experiences ("rotating cube", "explorable scene")
• Needs WebGL or canvas-based rendering
• Asks for animations, particles, or visual effects
• Mentions Three.js, WebGL, or 3D rendering
• Wants to visualize data in 3D space

Core Setup Pattern

1. Essential Three.js Imports

Use ES module import maps for modern Three.js (r183+):

<script type="importmap">
{
  "imports": {
    "three": "https://cdn.jsdelivr.net/npm/[email protected]/build/three.module.js",
    "three/addons/": "https://cdn.jsdelivr.net/npm/[email protected]/examples/jsm/"
  }
}
</script>
<script type="module">
import * as THREE from "three";
import { OrbitControls } from "three/addons/controls/OrbitControls.js";
</script>

For production with npm/vite/webpack:

import * as THREE from "three";
import { OrbitControls } from "three/addons/controls/OrbitControls.js";

2. Scene Initialization

Every Three.js artifact needs these core components:

// Scene - contains all 3D objects
const scene = new THREE.Scene();

// Camera - defines viewing perspective
const camera = new THREE.PerspectiveCamera(
  75, // Field of view
  window.innerWidth / window.innerHeight, // Aspect ratio
  0.1, // Near clipping plane
  1000, // Far clipping plane
);
camera.position.z = 5;

// Renderer - draws the scene
const renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

3. Animation Loop

Use renderer.setAnimationLoop() (preferred) or requestAnimationFrame:

// Preferred: setAnimationLoop (handles WebXR compatibility)
renderer.setAnimationLoop(() => {
  mesh.rotation.x += 0.01;
  mesh.rotation.y += 0.01;
  renderer.render(scene, camera);
});

// Alternative: manual requestAnimationFrame
function animate() {
  requestAnimationFrame(animate);
  mesh.rotation.x += 0.01;
  mesh.rotation.y += 0.01;
  renderer.render(scene, camera);
}
animate();