nanocode/particle-lab/08-nave/index.html

<!DOCTYPE html>
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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>08 - NAVE | 飞船导航</title>
    <style>
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { background: #000; overflow: hidden; font-family: 'Space Mono', monospace; }
        #canvas-container { width: 100vw; height: 100vh; }
        .info {
            position: fixed; top: 20px; left: 20px; color: #4ade80;
            font-size: 14px; pointer-events: none; z-index: 100;
            text-shadow: 0 0 10px rgba(74,222,128,0.5);
        }
        .info h1 { font-size: 20px; margin-bottom: 8px; }
        .info p { opacity: 0.8; font-size: 12px; margin: 4px 0; }
    </style>
</head>
<body>
    <div id="canvas-container"></div>
    <div class="info">
        <h1>08 - NAVE</h1>
        <p>飞船导航箭头 + 星空尾迹</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 scene = new THREE.Scene();
        scene.fog = new THREE.FogExp2(0x000000, 0.005);
        const camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 0.1, 2000);
        camera.position.set(0, 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 target = new THREE.Vector3();
        const geometry = new THREE.ConeGeometry(0.2, 0.6, 4);
        const material = new THREE.MeshBasicMaterial({ color: 0xffffff });
        const instancedMesh = new THREE.InstancedMesh(geometry, material, COUNT);
        instancedMesh.instanceMatrix.setUsage(THREE.DynamicDrawUsage);
        scene.add(instancedMesh);

        const positions = [];
        for (let i = 0; i < COUNT; i++) {
            positions.push(new THREE.Vector3(0, 0, 0));
        }

        // 箭头形状的点阵
        const arrowPoints = [];
        // 箭头头部（三角形）
        for (let y = 0; y < 15; y++) {
            const width = (15 - y) * 0.8;
            for (let x = -width; x <= width; x += 0.5) {
                arrowPoints.push({x: x, y: y + 5, z: 0});
            }
        }
        // 箭尾
        for (let y = -15; y < 5; y++) {
            for (let x = -2; x <= 2; x += 0.5) {
                arrowPoints.push({x: x, y: y, z: 0});
            }
        }

        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++) {
                if (i < arrowPoints.length) {
                    // 主箭头形状
                    const pt = arrowPoints[i];
                    // 波浪运动
                    const waveZ = Math.sin(time * 3 + pt.y * 0.3) * 2;
                    const waveX = Math.cos(time * 2 + pt.y * 0.2) * 1;
                    target.set(pt.x + waveX, pt.y, pt.z + waveZ);
                    
                    dummy.position.copy(positions[i].lerp(target, 0.1));
                    // 箭头指向运动方向
                    dummy.lookAt(target.x, target.y + 1, target.z);
                } else {
                    // 尾迹粒子 - 流动效果
                    const trailIdx = i - arrowPoints.length;
                    const t = trailIdx / (COUNT - arrowPoints.length);
                    const angle = t * Math.PI * 2 + time * 0.5;
                    const radius = 20 + t * 30;
                    const y = -30 + t * 20 + Math.sin(time * 2 + t * 10) * 5;
                    target.set(Math.cos(angle) * radius, y, Math.sin(angle) * radius);
                    
                    dummy.position.copy(positions[i].lerp(target, 0.05));
                    dummy.lookAt(0, y + 10, 0);
                }
                
                dummy.updateMatrix();
                instancedMesh.setMatrixAt(i, dummy.matrix);
                
                // 颜色：箭头亮绿，尾迹渐变
                const isArrow = i < arrowPoints.length;
                const hue = isArrow ? 0.35 : 0.3 + (i / COUNT) * 0.2;
                const lightness = isArrow ? 0.6 : 0.3 + Math.sin(time + i * 0.01) * 0.1;
                color.setHSL(hue, 0.9, lightness);
                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>
</body>
</html>