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Node.jsでThree.jsを使う方法

Posted at

いつも忘れるので...

ディレクトリ内にindex.html,script.js(とその他必要な)ファイルを用意

index.html
<!DOCTYPE html>
<html lang="ja">
    <head>
        <meta charset="utf-8">
        <title>Node.jsでThree.js</title>
        <link rel="stylesheet" href="style.css">
        <script type="module" src="script.js"></script>
    </head>
    <body>
        <h1>Hello, World</h1>
        <div id="webgl"></div>
    </body>
</html>
script.js
import * as THREE from 'three';

let scene, camera, renderer;

function init(){
    scene = new THREE.Scene();

    camera = new THREE.PerspectiveCamera(45,window.innerWidth/window.innerHeight,1,1000);
    camera.position.set(0,15,0);
    camera.lookAt(0,0,0);

    renderer = new THREE.WebGLRenderer();
    renderer.setClearColor(0x000000);
    renderer.setSize(window.innerWidth, window.innerHeight);
    renderer.setPixelRatio(window.devicePixelRatio);

    //環境光
    let ambientLight = new THREE.AmbientLight(0xcccccc,0.1);
    scene.add(ambientLight);

    //平行光源
    let directionalLight = new THREE.DirectionalLight(0xffffff, 0.5);
    directionalLight.position.set(10, 100, 0);
    scene.add(directionalLight);

    //立方体を一つ描画
    let boxGeometry = new THREE.BoxGeometry(5,5,5);
    let boxMaterial = new THREE.MeshLambertMaterial({
        color:0xff0000
    });
    let box = new THREE.Mesh(boxGeometry, boxMaterial);
    box.position.set(0,0,0);
    box.rotation.x = Math.PI * 0.5
    scene.add(box);
    //console.log(box);
    
    document.getElementById('webgl').appendChild(renderer.domElement);

    render();

    function render(){
        requestAnimationFrame(render);
        renderer.render(scene, camera);
        box.rotation.x += 0.01;
        box.rotation.y += 0.01;
    }
}

window.onload = init;

style.css
*{
    margin: 0;
    padding: 0;
    list-style: none;
}

ターミナルでthreeとviteをインストール

Three.js本体をインストール

npm install --save three

ビルドツール「Vite」をインストールして実行

npm install --save-dev vite
npx vite

npx viteを実行すると、ターミナルに Local: http://127.0.0.1:0000/ のように表示されるので、こちらにブラウザでアクセスすると、実行結果が表示されます。

止め方

Ctrl + C でサーバーが停止します。

参考

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