nanocode/particle-lab/10-galaxy/index.html

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    <title>10 - GALAXY | 螺旋星系</title>
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        <h1>10 - GALAXY</h1>
        <p>螺旋星系 - 对数旋臂</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 = 10000;
        const ARMS = 4; // 4条旋臂
        
        const scene = new THREE.Scene();
        scene.fog = new THREE.FogExp2(0x000000, 0.003);
        const camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 0.1, 2000);
        camera.position.set(0, 80, 0); // 俯视角度
        
        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 = 0.2;

        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 = 0.5; 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.SphereGeometry(0.2, 6, 6);
        const material = new THREE.MeshBasicMaterial({ color: 0xffffff });
        const instancedMesh = new THREE.InstancedMesh(geometry, material, COUNT);
        instancedMesh.instanceMatrix.setUsage(THREE.DynamicDrawUsage);
        scene.add(instancedMesh);

        // 星系数据
        const stars = [];
        for (let i = 0; i < COUNT; i++) {
            stars.push({
                arm: Math.floor(Math.random() * ARMS),
                dist: Math.pow(Math.random(), 0.7) * 50, // 更多粒子在外围
                angleOffset: (Math.random() - 0.5) * 0.5, // 旋臂宽度
                height: (Math.random() - 0.5) * (2 + Math.random() * 3), // 盘面厚度
                speed: 0,
                size: 0.5 + Math.random() * 1.5,
                type: Math.random() < 0.1 ? 'blue' : (Math.random() < 0.3 ? 'red' : 'yellow') // 恒星类型
            });
        }

        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 s = stars[i];
                
                // 对数螺旋: r = a * e^(b*θ)
                const armAngle = (s.arm / ARMS) * Math.PI * 2;
                const spiralTightness = 0.3;
                const angle = armAngle + s.dist * spiralTightness * 0.1 + time * (20 / (s.dist + 5)) + s.angleOffset;
                
                // 旋转
                const currentAngle = angle + time * 0.1;
                
                // 位置
                const x = Math.cos(currentAngle) * s.dist;
                const z = Math.sin(currentAngle) * s.dist;
                const y = s.height * Math.exp(-s.dist / 20) + Math.sin(time + s.dist * 0.1) * 0.5;
                
                dummy.position.set(x, y, z);
                dummy.scale.setScalar(s.size * (1 + Math.sin(time * 2 + i) * 0.2));
                dummy.updateMatrix();
                instancedMesh.setMatrixAt(i, dummy.matrix);
                
                // 颜色：基于恒星类型和距离
                let hue, sat, light;
                if (s.dist < 8) {
                    // 中心核球: 黄白色
                    hue = 0.08; sat = 0.3; light = 0.7;
                } else if (s.type === 'blue') {
                    hue = 0.6; sat = 0.8; light = 0.6; // 蓝巨星
                } else if (s.type === 'red') {
                    hue = 0.02; sat = 0.9; light = 0.5; // 红矮星
                } else {
                    // 主序星: 黄白色渐变
                    hue = 0.12 + (s.dist / 50) * 0.05;
                    sat = 0.6;
                    light = 0.5 + (1 - s.dist / 50) * 0.2;
                }
                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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