threejs realistic globe that updates the mesh image to match sunli in typescript

To create a realistic globe in Three.js that updates the mesh image to match the sun's lighting, you can follow these steps:

Create a new THREE.WebGLRenderer and add it to your HTML document:


index.ts
const renderer = new THREE.WebGLRenderer();
document.body.appendChild(renderer.domElement);
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Set up a new THREE.Scene and add a new THREE.PerspectiveCamera:


index.ts
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
camera.position.z = 5;
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Load a texture map for the globe using THREE.TextureLoader:


index.ts
const texture = new THREE.TextureLoader().load('path/to/globe_texture.jpg');
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Create a new THREE.SphereGeometry and add a new THREE.Mesh with the texture map:


index.ts
const geometry = new THREE.SphereGeometry(1, 32, 32);
const material = new THREE.MeshPhongMaterial({map: texture});

const mesh = new THREE.Mesh(geometry, material);
scene.add(mesh);
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Add some lighting to the scene, such as a new THREE.AmbientLight and a new THREE.PointLight:


index.ts
const ambientLight = new THREE.AmbientLight(0xffffff, 0.5);
scene.add(ambientLight);

const pointLight = new THREE.PointLight(0xffffff, 0.5);
pointLight.position.set(2, 2, 2);
scene.add(pointLight);
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Create a new function called animate and call it with requestAnimationFrame:


index.ts
function animate() {
    requestAnimationFrame(animate);

    // Update mesh position here

    renderer.render(scene, camera);
}

animate();
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To update the mesh image based on the sun's lighting, you can create a new THREE.Vector3 object to represent the direction of the sun, and then update the mesh material's color based on the angle between the sun vector and the surface normal of each vertex in the mesh:


index.ts
const sunVector = new THREE.Vector3(1, 0, 0);
geometry.vertices.forEach((vertex: THREE.Vector3) => {
    const surfaceNormal = mesh.localToWorld(vertex.clone()).normalize();
    const angle = surfaceNormal.angleTo(sunVector);
    material.color.setHSL(0.6 - (0.5 * angle / Math.PI), 1, 0.5);
});
geometry.verticesNeedUpdate = true;
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This will update the mesh's color based on how much each point faces the sun, resulting in a realistic globe that appears to rotate and reflect the sun's lighting.

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