2-Interactive 3D Lighting and Animation with Three.js

This code creates a dynamic 3D scene using Three.js, featuring a rotating sphere illuminated by ambient and directional lighting. The WebGL renderer adjusts to different screen sizes, providing a responsive and interactive experience. The scene includes realistic lighting, shadows, and smooth animations.

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Three.js 3D rendering WebGL JavaScript lighting sphere animation directional light ambient light responsive design canvas 3D scene shadows Web development graphics interactive experience renderer rotation dynamic scene real-time rendering canvas container resizing

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Three.js Lighting Example</title>
    <style>
        /* Basic styles for the page */
        body {
            margin: 0;
            font-family: Arial, sans-serif;
            background-color: #222;
            color: white;
        }

        /* Modal container styles */
        .modal {
            position: fixed;
            top: 10%;
            left: 10%;
            width: 80%;
            height: 80%;
            background-color: rgba(0, 0, 0, 0.9);
            border-radius: 10px;
            display: flex;
            justify-content: center;
            align-items: center;
            overflow: hidden;
        }

        /* Canvas container styles */
        #threeCanvas {
            width: 100%;
            height: 100%;
        }

        /* Slider container styles */
        .slider-container {
            position: absolute;
            bottom: 10px;
            width: 100%;
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 20px;
        }

        .slider {
            width: 200px;
        }

        label {
            color: white;
        }
    </style>
</head>
<body>
    <!-- Modal to contain the Three.js canvas -->
    <div class="modal">
        <!-- Div container for Three.js rendering -->
        <div id="threeCanvas"></div>
    </div>

    <!-- Slider controls for light intensity and direction -->
    <div class="slider-container">
        <div>
            <label for="intensitySlider">Light Intensity</label>
            <input type="range" id="intensitySlider" class="slider" min="0" max="2" step="0.01" value="0.8">
        </div>
        <div>
            <label for="directionSliderX">Light Direction X</label>
            <input type="range" id="directionSliderX" class="slider" min="-5" max="5" step="0.1" value="5">
        </div>
        <div>
            <label for="directionSliderY">Light Direction Y</label>
            <input type="range" id="directionSliderY" class="slider" min="-5" max="5" step="0.1" value="5">
        </div>
        <div>
            <label for="directionSliderZ">Light Direction Z</label>
            <input type="range" id="directionSliderZ" class="slider" min="-5" max="5" step="0.1" value="5">
        </div>
    </div>

    <!-- Include the Three.js library from a CDN -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
    <script>
        // Select the container for rendering the Three.js scene
        const canvasContainer = document.getElementById('threeCanvas');

        // Create the Three.js scene
        const scene = new THREE.Scene();

        // Create a perspective camera
        const camera = new THREE.PerspectiveCamera(
            75, // Field of view in degrees
            canvasContainer.offsetWidth / canvasContainer.offsetHeight, // Aspect ratio
            0.1, // Near clipping plane
            1000 // Far clipping plane
        );

        // Create the WebGL renderer
        const renderer = new THREE.WebGLRenderer();
        renderer.setSize(canvasContainer.offsetWidth, canvasContainer.offsetHeight);
        canvasContainer.appendChild(renderer.domElement);

        // Add ambient light to the scene
        const ambientLight = new THREE.AmbientLight(0xffffff, 0.3);
        scene.add(ambientLight);

        // Add directional light to the scene
        const directionalLight = new THREE.DirectionalLight(0xffffff, 0.8);
        directionalLight.position.set(5, 5, 5);
        directionalLight.castShadow = true;
        scene.add(directionalLight);

        // Create the geometry for a sphere
        const geometry = new THREE.SphereGeometry(1, 64, 64);

        // Create the material for the sphere
        const material = new THREE.MeshStandardMaterial({
            color: 0xadd8e6,
            wireframe: false
        });

        // Create the sphere mesh by combining geometry and material
        const sphere = new THREE.Mesh(geometry, material);
        scene.add(sphere);

        // Position the camera to view the sphere
        camera.position.z = 5;

        // Function to animate the scene
        function animate() {
            requestAnimationFrame(animate);

            // Rotate the sphere for dynamic visualization
            sphere.rotation.x += 0.02;
            sphere.rotation.y += 0.01;

            // Render the scene from the camera's perspective
            renderer.render(scene, camera);
        }

        // Start the animation loop
        animate();

        // Adjust the renderer size when the window is resized
        window.addEventListener('resize', () => {
            const width = canvasContainer.offsetWidth;
            const height = canvasContainer.offsetHeight;
            renderer.setSize(width, height);
            camera.aspect = width / height;
            camera.updateProjectionMatrix();
        });

        // Event listeners for the sliders to control light intensity and direction
        const intensitySlider = document.getElementById('intensitySlider');
        const directionSliderX = document.getElementById('directionSliderX');
        const directionSliderY = document.getElementById('directionSliderY');
        const directionSliderZ = document.getElementById('directionSliderZ');

        // Update light intensity and direction when sliders are moved
        intensitySlider.addEventListener('input', (event) => {
            directionalLight.intensity = event.target.value; // Update light intensity
        });

        directionSliderX.addEventListener('input', (event) => {
            directionalLight.position.x = event.target.value; // Update light direction X
        });

        directionSliderY.addEventListener('input', (event) => {
            directionalLight.position.y = event.target.value; // Update light direction Y
        });

        directionSliderZ.addEventListener('input', (event) => {
            directionalLight.position.z = event.target.value; // Update light direction Z
        });
    </script>
</body>
</html>

CODE SIMULATION

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