Three.js Quick Start - Run Spinning-Cube Example
In this post, I am going to run the spinning-cube example for three.js.
https://threejs.org/docs/#manual/en/introduction/Creating-a-scene
What is three.js?
three.js is a JavaScript library to render 3D graphics on a browser.
Example
% mkdir threejs && cd threejs
% mkdir js
% curl -o ./js/three.js https://threejs.org/build/three.js
% tree
.
├── index.html
└── js
└── three.js% vim index.html
% open index.html
index.html (the code is from example)
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>My first three.js app</title>
<style>
body { margin: 0; }
</style>
</head>
<body>
<script src="js/three.js"></script>
<script>
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 );
const renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
const geometry = new THREE.BoxGeometry();
const material = new THREE.MeshBasicMaterial( { color: 0x00ff00 } );
const cube = new THREE.Mesh( geometry, material );
scene.add( cube );
camera.position.z = 5;
const animate = function () {
requestAnimationFrame( animate );
cube.rotation.x += 0.01;
cube.rotation.y += 0.01;
renderer.render( scene, camera );
};
animate();
</script>
</body>
</html>
You will see the cube is spinning on your browser, as shown on top of this post.
Snippet for what is going on:
- "we need three things: scene, camera and renderer"
- "To create a cube, we need a BoxGeometry"
- we need "render" or "animate loop" to see it
Modify a bit
- Color: blue
- Spin: faster
- Size: bigger -> move the camera closer
% cp index.html modified.html
% vim modified.html
% open modified.html
diff
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