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ThreeJS

We introduced threeJS to help us create 3D scenes. This section will give a brief introduction to three.js; We're going to start building a scene.

Module import​

    import * as THREE from '/three/build/three.module.js';

Create a scenario​

In order to be able to actually display anything with three.js, we need three things: the scene, the camera, and the renderer so that we can render the scene with the camera.

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 );

Render the scene​

We need to create a continuously rendering effect or animation loop to display the individual.

function animate() {
    requestAnimationFrame( animate );
    renderer.render( scene, camera );
}
animate();

Result​

You have now completed your first three.js application. The full code is available below as an editable live example.

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>My first three.js app</title>
        <style>
            body { margin: 0; }
        </style>
    </head>
    <body>
        <script type="module">
            import * as THREE from '/three/build/three.module.js';
            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;

            function animate() {
                requestAnimationFrame( animate );
                renderer.render( scene, camera );
            };

            animate();
        </script>
    </body>
</html>