GeometryDash3D/js/main.js

window.addEventListener("load", () => main());

const main = () => {
    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(1, 1, 1);
    const material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });
    const cube = new THREE.Mesh(geometry, material);
    scene.add(cube);

    camera.position.z = 5;

    const animate = () => {
        requestAnimationFrame(animate);
        renderer.render(scene, camera);
    }

    animate();
};