nanocode/particle-lab/14-vortex/index.html

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    <title>14 - VORTEX | 龙卷风</title>
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        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { background: #000; overflow: hidden; font-family: 'Space Mono', monospace; }
        #canvas-container { width: 100vw; height: 100vh; }
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            position: fixed; top: 20px; left: 20px; color: #22d3ee;
            font-size: 14px; pointer-events: none; z-index: 100;
            text-shadow: 0 0 10px rgba(34,211,238,0.8);
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        .info h1 { font-size: 20px; margin-bottom: 8px; }
        .info p { opacity: 0.8; font-size: 12px; margin: 4px 0; }
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<body>
    <div id="canvas-container"></div>
    <div class="info">
        <h1>14 - VORTEX</h1>
        <p>龙卷风 - 螺旋上升气流</p>
        <p>粒子数: <span id="count">0</span></p>
        <p>FPS: <span id="fps">0</span></p>
    </div>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/three@0.128.0/examples/js/controls/OrbitControls.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/three@0.128.0/examples/js/postprocessing/EffectComposer.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/three@0.128.0/examples/js/postprocessing/RenderPass.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/three@0.128.0/examples/js/postprocessing/ShaderPass.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/three@0.128.0/examples/js/shaders/CopyShader.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/three@0.128.0/examples/js/shaders/LuminosityHighPassShader.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/three@0.128.0/examples/js/postprocessing/UnrealBloomPass.js"></script>

    <script>
        const COUNT = 8000;
        const BANDS = 5; // 5层风带
        
        const scene = new THREE.Scene();
        scene.fog = new THREE.FogExp2(0x000000, 0.004);
        const camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 0.1, 2000);
        camera.position.set(40, 30, 60);
        
        const renderer = new THREE.WebGLRenderer({ antialias: true, powerPreference: "high-performance" });
        renderer.setSize(window.innerWidth, window.innerHeight);
        renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
        document.getElementById('canvas-container').appendChild(renderer.domElement);

        const controls = new THREE.OrbitControls(camera, renderer.domElement);
        controls.enableDamping = true;
        controls.autoRotate = true;
        controls.autoRotateSpeed = 0.5;

        const renderScene = new THREE.RenderPass(scene, camera);
        const bloomPass = new THREE.UnrealBloomPass(new THREE.Vector2(window.innerWidth, window.innerHeight), 1.5, 0.4, 0);
        bloomPass.strength = 1.5; bloomPass.radius = 0.4; bloomPass.threshold = 0;
        const composer = new THREE.EffectComposer(renderer);
        composer.addPass(renderScene);
        composer.addPass(bloomPass);

        const dummy = new THREE.Object3D();
        const color = new THREE.Color();
        const geometry = new THREE.BoxGeometry(0.3, 0.3, 0.3);
        const material = new THREE.MeshBasicMaterial({ color: 0xffffff });
        const instancedMesh = new THREE.InstancedMesh(geometry, material, COUNT);
        instancedMesh.instanceMatrix.setUsage(THREE.DynamicDrawUsage);
        scene.add(instancedMesh);

        // 龙卷风粒子
        const particles = [];
        for (let i = 0; i < COUNT; i++) {
            const band = Math.floor(Math.random() * BANDS);
            const bandRadius = 3 + band * 4; // 每层半径递增
            
            particles.push({
                angle: Math.random() * Math.PI * 2,
                height: Math.random() * 80 - 40,
                radius: bandRadius + (Math.random() - 0.5) * 3,
                band: band,
                speed: 0.02 + (BANDS - band) * 0.005, // 内圈更快
                upSpeed: 0.1 + Math.random() * 0.1,
                wobble: Math.random() * Math.PI * 2,
                size: 0.5 + Math.random() * 0.5
            });
        }

        document.getElementById('count').textContent = COUNT;
        let lastTime = performance.now(), frameCount = 0;
        const fpsEl = document.getElementById('fps');
        const clock = new THREE.Clock();

        function animate() {
            requestAnimationFrame(animate);
            const now = performance.now();
            frameCount++;
            if (now - lastTime >= 1000) { fpsEl.textContent = frameCount; frameCount = 0; lastTime = now; }

            const time = clock.getElapsedTime();

            for (let i = 0; i < COUNT; i++) {
                const p = particles[i];
                
                // 旋转
                p.angle += p.speed;
                
                // 上升
                p.height += p.upSpeed;
                
                // 半径变化：越往上越细（漏斗形状）
                const heightFactor = Math.max(0.1, 1 - (p.height + 40) / 100);
                const currentRadius = p.radius * Math.sqrt(heightFactor) + Math.sin(time * 3 + p.wobble) * 0.5;
                
                // 重置到底部
                if (p.height > 40) {
                    p.height = -40;
                    p.angle = Math.random() * Math.PI * 2;
                }
                
                // 位置
                const x = Math.cos(p.angle) * currentRadius;
                const z = Math.sin(p.angle) * currentRadius;
                const y = p.height;
                
                dummy.position.set(x, y, z);
                
                // 朝向旋转方向
                dummy.rotation.y = -p.angle;
                dummy.rotation.z = Math.atan2(p.upSpeed, p.speed * currentRadius) * 2;
                
                // 大小：内圈更大更明显
                const sizeScale = (BANDS - p.band + 1) / BANDS;
                dummy.scale.setScalar(p.size * sizeScale * (1 + Math.sin(time * 5 + i * 0.01) * 0.3));
                
                dummy.updateMatrix();
                instancedMesh.setMatrixAt(i, dummy.matrix);
                
                // 颜色：基于高度和层级
                // 底部：深色，顶部：浅色
                const heightRatio = (p.height + 40) / 80;
                const hue = 0.5 + p.band * 0.02; // 青色到蓝色
                const sat = 0.7 + heightRatio * 0.3;
                const light = 0.2 + heightRatio * 0.5;
                color.setHSL(hue, sat, light);
                instancedMesh.setColorAt(i, color);
            }

            instancedMesh.instanceMatrix.needsUpdate = true;
            instancedMesh.instanceColor.needsUpdate = true;
            controls.update();
            composer.render();
        }
        animate();

        window.addEventListener('resize', () => {
            camera.aspect = window.innerWidth / window.innerHeight;
            camera.updateProjectionMatrix();
            renderer.setSize(window.innerWidth, window.innerHeight);
            composer.setSize(window.innerWidth, window.innerHeight);
        });
    </script>
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</html>