真实烟花效果代码

Question

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>3D烟花特效</title> <style> body { margin: 0; overflow: hidden; background: #000; }

text
    canvas {
        display: block;
    }
</style>

</head> <body> <script src="https://cdn.jsdelivr.net/npm/[email protected]/build/three.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/shaders/LuminosityHighPassShader.js"></script> <script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/shaders/CopyShader.js"></script> <script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/postprocessing/EffectComposer.js"></script> <script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/postprocessing/BloomPass.js"></script> <script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/postprocessing/ShaderPass.js"></script> <script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/postprocessing/RenderPass.js"></script> <script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/postprocessing/UnrealBloomPass.js"></script> <script> // 轨迹粒子几何体（全局共用） const trailGeometry = new THREE.SphereGeometry(0.2, 8, 8); const trailMaterial = new THREE.MeshBasicMaterial({ color: 0xFFA500, // 橙色轨迹 transparent: true, opacity: 0.7 });

text
    // 场景初始化
    const scene = new THREE.Scene();
    const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
    const renderer = new THREE.WebGLRenderer();
    renderer.setSize(window.innerWidth, window.innerHeight);
    document.body.appendChild(renderer.domElement);
    camera.position.z = 50;

    // 在场景初始化后添加后期处理
    const composer = new THREE.EffectComposer(renderer);
    const renderPass = new THREE.RenderPass(scene, camera);
    const bloomPass = new THREE.UnrealBloomPass(
        new THREE.Vector2(window.innerWidth, window.innerHeight),
        1.5, // 强度
        2, // 减小泛光半径
        0.85 // 阈值
    );
    bloomPass.threshold = 0.1; // 增加泛光阈值，减少过度发光
    bloomPass.strength = 0.5; // 减小泛光强度
    bloomPass.radius = 0.5;
    composer.addPass(renderPass);
    composer.addPass(bloomPass);

    // 烟花粒子类
    class Firework {
        constructor() {
            this.particles = [];
            // 增加更丰富的颜色变化
            this.color = new THREE.Color().setHSL(
                Math.random(), // 色相
                0.8 + Math.random() * 0.2, // 提高饱和度
                0.4 + Math.random() * 0.3 // 降低亮度范围
            );
            this.exploded = false;
            this.dead = false;

            // 增加更多形状变化
            this.baseSize = Math.random() * 1 + 0.5;
            this.explosionCount = Math.floor(Math.random() * 5) + 1; // 最多三次爆炸
            this.explosionPattern = Math.floor(Math.random() * 5); // 0-4种爆炸模式
            this.dragCoefficient = 0.97 + Math.random() * 0.03; // 空气阻力系数

            // 使用 BufferGeometry 和 Points 来管理粒子
            const geometry = new THREE.BufferGeometry();
            const positions = [];
            const colors = [];
            const sizes = [];
            this.particleCount = 200;
            for (let i = 0; i < this.particleCount; i++) {
                positions.push(0, 0, 0); // 初始位置
                colors.push(this.color.r, this.color.g, this.color.b);
                sizes.push(this.baseSize);
            }
            geometry.setAttribute('position', new THREE.Float32BufferAttribute(positions, 3));
            geometry.setAttribute('customColor', new THREE.Float32BufferAttribute(colors, 3));
            geometry.setAttribute('size', new THREE.Float32BufferAttribute(sizes, 1));

            // 添加粒子速度数组
            this.velocities = [];
            for (let i = 0; i < this.particleCount; i++) {
                this.velocities.push(new THREE.Vector3());
            }

            const material = new THREE.ShaderMaterial({
                uniforms: {
                    color: { value: new THREE.Color(0xffffff) },
                    pointTexture: { value: new THREE.TextureLoader().load('https://threejs.org/examples/textures/sprites/disc.png') }
                },
                vertexShader: `
                    attribute float size;
                    attribute vec3 customColor;
                    varying vec3 vColor;
                    varying float life;
                    void main() {
                        life = 1.0 - (position.y + 30.0) / 60.0; // 基于高度的生命周期
                        vColor = customColor * (1.0 + 2.0 * life); // 颜色增强
                        vec4 mvPosition = modelViewMatrix * vec4(position, 1.0);
                        gl_PointSize = size * (300.0 / -mvPosition.z);
                        gl_Position = projectionMatrix * mvPosition;
                    }
                `,
                fragmentShader: `
                    uniform vec3 color;
                    uniform sampler2D pointTexture;
                    varying vec3 vColor;
                    void main() {
                        gl_FragColor = vec4(color * vColor, 1.0);
                        gl_FragColor = gl_FragColor * texture2D(pointTexture, gl_PointCoord);
                        if (gl_FragColor.a < 0.1) discard;
                    }
                `,
                blending: THREE.AdditiveBlending,
                depthTest: false,
                transparent: true
            });

            this.particles = new THREE.Points(geometry, material);
            // 减小发射范围
            const randomX = (Math.random() - 0.5) * window.innerWidth * 0.8; // 使用屏幕宽度的80%作为范围 
            const randomZ = (Math.random() - 0.5) * 40;
            this.particles.position.set(randomX, -30, randomZ);

            // 调整发射速度，目标点更分散
            // 在空间中随机选择爆炸点
            // 确保目标点在视野范围内
            const targetX = randomX; // 保持水平位置不变
            const targetZ = randomZ;
            const targetY = 15 + Math.random() * 10; // 控制爆炸高度

            // 计算从初始位置到目标位置的方向
            const directionX = targetX - randomX;
            const directionZ = targetZ - randomZ;
            const directionY = targetY - (-30);

            // 标准化方向并设置速度
            const length = Math.sqrt(directionX * directionX + directionY * directionY + directionZ * directionZ);
            // 随机化速度大小
            const speedMultiplier = 1.2 + Math.random() * 0.3; // 调整速度范围
            this.velocity = new THREE.Vector3(
                directionX / length * speedMultiplier,
                directionY / length * speedMultiplier,
                directionZ / length * speedMultiplier
            );

            // 存储目标位置用于判断爆炸
            this.targetPosition = new THREE.Vector3(targetX, targetY, targetZ);
            // 设置允许的爆炸距离误差
            this.explosionTolerance = 5;

            // 初始化每个粒子的速度
            for (let i = 0; i < this.particleCount; i++) {
                this.velocities[i].set(
                    (Math.random() - 0.5) * 1,
                    Math.random() * 2 + 2,
                    (Math.random() - 0.5) * 1
                );
            }

            scene.add(this.particles);
        }

        explode(phase = 0) {
            // 使用 Points 系统进行爆炸
            const geometry = this.particles.geometry;
            const positions = geometry.attributes.position.array;
            const sizes = geometry.attributes.size.array;
            // 获取当前烟花的位置作为爆炸中心点
            const centerX = this.particles.position.x;
            const centerY = this.particles.position.y;
            const centerZ = this.particles.position.z;

            for (let i = 0; i < this.particleCount; i++) {
                // 设置粒子的初始位置为爆炸中心
                positions[i * 3 + 0] = 0;
                positions[i * 3 + 1] = 0;
                positions[i * 3 + 2] = 0;

                // 为每个粒子设置向外扩散的速度
                const phi = Math.random() * Math.PI * 2;
                const theta = Math.random() * Math.PI;
                const speed = 2 + Math.random() * 3; // 减小爆炸速度

                this.velocities[i].set(
                    Math.sin(theta) * Math.cos(phi) * speed,
                    Math.cos(theta) * speed,
                    Math.sin(theta) * Math.sin(phi) * speed
                );

                sizes[i] = Math.random() * 3 + 2; // 减小粒子尺寸

                // 更新颜色渐变
                const colors = this.particles.geometry.attributes.customColor.array;
                const baseIndex = i * 3;
                const currentColor = new THREE.Color(
                    colors[baseIndex],
                    colors[baseIndex + 1],
                    colors[baseIndex + 2]
                );
                const targetColor = new THREE.Color().setHSL(
                    Math.random(),
                    0.8 + Math.random() * 0.2,
                    0.4 + Math.random() * 0.3 // 降低爆炸粒子亮度
                );
                const lerpedColor = currentColor.lerp(targetColor, 0.3); // 减小颜色变化强度
                colors[baseIndex] = lerpedColor.r;
                colors[baseIndex + 1] = lerpedColor.g;
                colors[baseIndex + 2] = lerpedColor.b;
            }
            geometry.attributes.position.needsUpdate = true;
            geometry.attributes.customColor.needsUpdate = true;
            geometry.attributes.size.needsUpdate = true;

            this.exploded = true;

            // 添加连锁爆炸效果
            if (phase === 0 && this.explosionCount > 1) {
                setTimeout(() => this.explode(1), 400 + Math.random() * 200);
            }

            // 修正轨迹材质创建方式
            if(phase === 0) {
                this.trailParticles = new THREE.Group();
                const trailColor = this.color.clone().multiplyScalar(1.5);
                
                for(let i=0; i<20; i++) {
                    const material = trailMaterial.clone();
                    material.color = trailColor;  // 正确设置材质颜色的方式
                    material.transparent = true;
                    material.opacity = 0.7;

                    const trail = new THREE.Mesh(trailGeometry, material);
                    trail.position.copy(this.particles.position);
                    this.trailParticles.add(trail);
                }
                scene.add(this.trailParticles);
            }
        }

        update() {
            if (!this.exploded) {
                this.particles.position.add(this.velocity);
                this.velocity.y -= 0.015;

                // 增强上升轨迹的视觉效果
                this.particles.scale.set(
                    1 + Math.sin(Date.now() * 0.01) * 0.3,
                    1 + Math.cos(Date.now() * 0.01) * 0.3,
                    1
                );

                // 检查是否需要爆炸
                // 在以下情况爆炸：
                // 1. 接近目标位置
                // 2. 超出视野范围
                // 3. 上升速度过小
                if (
                    this.particles.position.distanceTo(this.targetPosition) < this.explosionTolerance ||
                    Math.abs(this.particles.position.x) > 50 ||
                    Math.abs(this.particles.position.z) > 50 ||
                    this.particles.position.y > 25 || // 增加最大高度
                    this.velocity.y < 0.3
                ) {
                    this.explode();
                }
            } else {
                let allDead = true;
                const positions = this.particles.geometry.attributes.position.array;
                for (let i = 0; i < this.particleCount; i++) {
                    // 根据速度更新粒子位置
                    positions[i * 3 + 0] += this.velocities[i].x * 0.016;
                    positions[i * 3 + 1] += this.velocities[i].y * 0.016;
                    positions[i * 3 + 2] += this.velocities[i].z * 0.016;

                    // 更新速度（重力作用）
                    this.velocities[i].y -= 0.02; // 减小重力影响
                    // 添加阻力
                    this.velocities[i].multiplyScalar(this.dragCoefficient); // 应用空气阻力公式

                    // 检查粒子是否仍在可见范围内
                    const speed = this.velocities[i].length();
                    if (speed > 0.1) { // 当粒子速度足够小时才消失
                        allDead = false;
                    }
                }
                this.particles.geometry.attributes.position.needsUpdate = true;
                this.dead = allDead;

                // 粒子逐渐变小
                const sizes = this.particles.geometry.attributes.size.array;
                for (let i = 0; i < this.particleCount; i++) {
                    sizes[i] *= 0.99;
                }
                this.particles.geometry.attributes.size.needsUpdate = true;
            }

            // 添加轨迹粒子自动清理
            if(this.trailParticles && this.trailParticles.children.length > 0) {
                this.trailParticles.children.forEach(particle => {
                    particle.material.opacity *= 0.9;
                    if(particle.material.opacity < 0.05) {
                        this.trailParticles.remove(particle);
                    }
                });
            }
        }
    }

    const fireworks = [];
    let lastFireworkTime = 0; // 添加一个变量来记录上次创建烟花的时间

    // 性能优化
    const performanceConfig = {
        maxFireworks: window.innerWidth < 768 ? 2 : 4, // 减少同时存在的烟花数量
        particleMultiplier: window.devicePixelRatio > 1 ? 0.7 : 1,
        bloomStrength: window.devicePixelRatio > 1 ? 0.8 : 1.0 // 降低泛光强度
    };

    // 动画循环
    function animate() {
        requestAnimationFrame(animate);

        const currentTime = Date.now();

        // 移除最大烟花数量限制，改为固定时间间隔创建新烟花
        if (currentTime - lastFireworkTime > 400) { // 每800毫秒发射一个新烟花
            // 每次发射2-30个烟花
            const count = Math.floor(Math.random() * 2) + 30;
            for (let i = 0; i < count; i++) {
                fireworks.push(new Firework());
            }
            lastFireworkTime = currentTime;
        }

        // 更新和清理烟花
        for (let i = fireworks.length - 1; i >= 0; i--) {
            fireworks[i].update();
            if (fireworks[i].dead) {
                scene.remove(fireworks[i].particles);
                fireworks.splice(i, 1);
            }
        }

        composer.render();
    }

    // 窗口大小调整
    window.addEventListener('resize', () => {
        camera.aspect = window.innerWidth / window.innerHeight;
        camera.updateProjectionMatrix();
        renderer.setSize(window.innerWidth, window.innerHeight);
        composer.setSize(window.innerWidth, window.innerHeight);
    });

    animate();
</script>

</body> </html> 对比与真实的烟花秀，当前代码实现的效果并不真实。请优化一下。

Answer 1

下面给出一段相对更贴近真实烟花效果的示例代码，重点在于：

真实烟花节奏
- 真实烟花不会像机枪一样连续发射，一般会有一段间隔，并且间隔还带有一定随机性。
- 在同一个大烟花秀里，也会有时“集中爆发”，有时零星绽放。
更自然的上升轨迹
- 真实烟花在上升时速度并非恒定，而且大多会带有轻微弧度或者抖动，表现出空气阻力和风的影响。
- 上升末期速度会衰减，几乎垂直后开始爆炸，而非瞬间到达指定点爆炸。
爆炸形状与层次
- 真实烟花往往不是一次爆炸就结束，可能会有多层次的爆炸，或呈现球形、环形、星形、柳絮状等。
- 用不同的算法去生成不同的爆炸分布，可以让场景更加丰富。
渐变、闪烁与重力衰减
- 烟花星点（颗粒）会随着时间快速衰减亮度和大小，有时带有闪烁效果。
- 重力会让爆炸后的颗粒向下坠落，并逐渐熄灭。
发射尾迹
- 火箭上升过程通常带有火光尾迹，颜色往往较单一（偏白黄），亮度随时间衰减；在爆炸时才会呈现主色。

下面这段示例代码针对这些方面都做了一些改进，你可以根据需要再做进一步微调（如减少粒子数量、减小 bloom 强度、改变爆炸形状等）：

html
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>更真实的3D烟花</title>
    <style>
        body {
            margin: 0;
            overflow: hidden;
            background: #000;
        }
        canvas {
            display: block;
        }
    </style>
</head>
<body>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/build/three.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/shaders/LuminosityHighPassShader.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/shaders/CopyShader.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/postprocessing/EffectComposer.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/postprocessing/BloomPass.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/postprocessing/ShaderPass.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/postprocessing/RenderPass.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/postprocessing/UnrealBloomPass.js"></script>

<script>
/**
 * -------------------------------------------
 * 场景、摄像机、渲染器和后期处理初始化
 * -------------------------------------------
 */
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    0.1,
    2000
);
camera.position.set(0, 20, 100);

const renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

// 后期处理
const composer = new THREE.EffectComposer(renderer);
const renderPass = new THREE.RenderPass(scene, camera);
composer.addPass(renderPass);

const bloomPass = new THREE.UnrealBloomPass(
    new THREE.Vector2(window.innerWidth, window.innerHeight),
    1.2, // 适当控制爆炸的炫光强度
    1.0,
    0.85
);
composer.addPass(bloomPass);

/**
 * -------------------------------------------
 * 烟花类：包括上升（带尾迹）和爆炸
 * -------------------------------------------
 */
class Firework {
    constructor() {
        this.isExploded = false;
        this.dead = false;

        // 烟花上升阶段：创造一个简单的“火箭”点
        this.rocketGeo = new THREE.SphereGeometry(0.4, 8, 8);
        this.rocketMat = new THREE.MeshBasicMaterial({ color: 0xffffff });
        this.rocket = new THREE.Mesh(this.rocketGeo, this.rocketMat);

        // 初始位置在底部（随机X和Z），Y稍低于视线
        this.rocket.position.set(
            (Math.random() - 0.5) * 60,
            -30,
            (Math.random() - 0.5) * 60
        );
        scene.add(this.rocket);

        // 目标爆炸高度
        this.targetY = 30 + Math.random() * 20;

        // 火箭上升速度（略带横向抖动，模拟风）
        this.velocity = new THREE.Vector3(
            (Math.random() - 0.5) * 0.2, // 偏小的水平抖动
            0.8 + Math.random() * 0.5,   // 主向上速度
            (Math.random() - 0.5) * 0.2
        );

        // 尾迹粒子，用 Points 来渲染
        // ---------------------------------------
        const trailCount = 40;
        const positions = new Float32Array(trailCount * 3);
        const colors = new Float32Array(trailCount * 3);
        for (let i = 0; i < trailCount; i++) {
            // 先都放在 (0,0,0)，等会儿动态更新
            positions[i * 3] = 0;
            positions[i * 3 + 1] = 0;
            positions[i * 3 + 2] = 0;

            // 尾迹大多是偏白偏黄
            const color = new THREE.Color(1, 0.8, 0.4);
            colors[i * 3] = color.r;
            colors[i * 3 + 1] = color.g;
            colors[i * 3 + 2] = color.b;
        }
        const trailGeometry = new THREE.BufferGeometry();
        trailGeometry.setAttribute(
            "position",
            new THREE.BufferAttribute(positions, 3)
        );
        trailGeometry.setAttribute(
            "color",
            new THREE.BufferAttribute(colors, 3)
        );

        const trailMaterial = new THREE.PointsMaterial({
            size: 0.8,
            vertexColors: true,
            blending: THREE.AdditiveBlending,
            depthWrite: false,
            transparent: true
        });

        this.trail = new THREE.Points(trailGeometry, trailMaterial);
        scene.add(this.trail);

        // 用来存储每个尾迹粒子坐标的队列
        this.trailPositions = [];
        this.trailLength = trailCount;

        // 爆炸阶段：预先创建爆炸粒子系统，但先隐藏
        // ---------------------------------------
        this.explosionCount = 120 + Math.floor(Math.random() * 60);
        const ePositions = new Float32Array(this.explosionCount * 3);
        const eColors = new Float32Array(this.explosionCount * 3);
        const eSizes = new Float32Array(this.explosionCount);

        this.velocities = [];

        // 随机主色
        this.fireworkColor = new THREE.Color().setHSL(
            Math.random(),
            0.7 + Math.random() * 0.3,
            0.5
        );

        for (let i = 0; i < this.explosionCount; i++) {
            // 初始都在 (0,0,0)，稍后爆炸时再加上爆心坐标
            ePositions[i * 3] = 0;
            ePositions[i * 3 + 1] = 0;
            ePositions[i * 3 + 2] = 0;

            // 爆炸的粒子颜色会在主色基础上稍有随机
            const colorVariation = this.fireworkColor.clone().offsetHSL(
                (Math.random() - 0.5) * 0.1,
                (Math.random() - 0.5) * 0.2,
                (Math.random() - 0.5) * 0.1
            );
            eColors[i * 3] = colorVariation.r;
            eColors[i * 3 + 1] = colorVariation.g;
            eColors[i * 3 + 2] = colorVariation.b;

            // 粒子大小
            eSizes[i] = 12 + Math.random() * 8;

            // 粒子速度（爆炸形态：均匀球面 + 少量的扁平或环形变化）
            // 先来个球面分布
            const theta = Math.random() * Math.PI * 2;
            const phi = Math.random() * Math.PI; 
            const r = 15 + Math.random() * 10; // 爆炸半径

            // 也可以额外判断，做一些环形或“柳絮状”分布
            let sx = r * Math.sin(phi) * Math.cos(theta);
            let sy = r * Math.cos(phi);
            let sz = r * Math.sin(phi) * Math.sin(theta);

            // 加一点“扁平”的概率：让y方向更扁
            if (Math.random() < 0.2) {
                sy *= 0.4;
            }

            // 记录速度向量
            this.velocities.push(new THREE.Vector3(sx, sy, sz));
        }

        const explosionGeometry = new THREE.BufferGeometry();
        explosionGeometry.setAttribute(
            "position",
            new THREE.BufferAttribute(ePositions, 3)
        );
        explosionGeometry.setAttribute(
            "color",
            new THREE.BufferAttribute(eColors, 3)
        );
        explosionGeometry.setAttribute(
            "size",
            new THREE.BufferAttribute(eSizes, 1)
        );

        // 使用 ShaderMaterial 来控制粒子大小衰减和纹理
        const explosionMaterial = new THREE.ShaderMaterial({
            uniforms: {
                pointTexture: {
                    value: new THREE.TextureLoader().load(
                        "https://threejs.org/examples/textures/sprites/disc.png"
                    )
                },
                uTime: { value: 0 },
            },
            vertexShader: `
                attribute float size;
                varying vec3 vColor;
                uniform float uTime;

                void main() {
                    vColor = color;

                    // 让粒子随时间变小
                    // 爆炸后 t 越大，粒子越小
                    float t = uTime * 0.6;  
                    float s = max(size - t*18.0, 0.0);

                    vec4 mvPosition = modelViewMatrix * vec4(position, 1.0);
                    gl_PointSize = s * (300.0 / -mvPosition.z);
                    gl_Position = projectionMatrix * mvPosition;
                }
            `,
            fragmentShader: `
                varying vec3 vColor;
                uniform sampler2D pointTexture;

                void main() {
                    gl_FragColor = vec4(vColor, 1.0);
                    gl_FragColor *= texture2D(pointTexture, gl_PointCoord);
                    // 让边缘更柔和
                    if (gl_FragColor.a < 0.1) discard;
                }
            `,
            blending: THREE.AdditiveBlending,
            depthTest: false,
            transparent: true,
            vertexColors: true
        });

        this.explosion = new THREE.Points(explosionGeometry, explosionMaterial);
        this.explosion.visible = false; // 初始隐藏，等到爆炸时再显示
        scene.add(this.explosion);

        // 时间
        this.clock = new THREE.Clock();
        this.timeOffset = Math.random() * 1000; // 让每朵烟花有点时间差
    }

    update(delta) {
        if (!this.isExploded) {
            // 上升阶段
            this.rocket.position.add(this.velocity);

            // 模拟空气阻力和重力对火箭的影响
            this.velocity.y -= 0.005;
            this.velocity.multiplyScalar(0.995); // 微弱衰减

            // 上升尾迹：记录历史位置，用于绘制
            this.recordTrail();

            if (this.rocket.position.y >= this.targetY || this.velocity.y < 0) {
                // 到达预定高度或速度衰减后爆炸
                this.explode();
            }
        } else {
            // 爆炸阶段
            const time = this.clock.getElapsedTime() + this.timeOffset;
            this.explosion.material.uniforms.uTime.value = time;

            // 让粒子向外扩散 + 重力
            const positions = this.explosion.geometry.attributes.position.array;
            for (let i = 0; i < this.velocities.length; i++) {
                const idx = i * 3;

                // velocities[i] 本身是爆心坐标系的“初速度”，
                // 每帧要叠加到 positions 上
                positions[idx] += this.velocities[i].x * delta;
                positions[idx + 1] += this.velocities[i].y * delta;
                positions[idx + 2] += this.velocities[i].z * delta;

                // 模拟重力
                this.velocities[i].y -= 0.08 * delta;

                // 空气阻力
                this.velocities[i].multiplyScalar(0.98);
            }
            this.explosion.geometry.attributes.position.needsUpdate = true;

            // 判断是否所有粒子已经衰减得几乎不可见，则回收
            if (time > 3.5) {
                // 粒子大约 3-4 秒后就可以消失
                this.dead = true;
            }
        }
    }

    recordTrail() {
        // 只记录固定长度的尾迹
        this.trailPositions.push(this.rocket.position.clone());
        if (this.trailPositions.length > this.trailLength) {
            this.trailPositions.shift(); // 移除最早的
        }

        // 更新 trail 的 geometry
        const positions = this.trail.geometry.attributes.position.array;
        for (let i = 0; i < this.trailPositions.length; i++) {
            const p = this.trailPositions[i];
            positions[i * 3] = p.x - this.rocket.position.x;
            positions[i * 3 + 1] = p.y - this.rocket.position.y;
            positions[i * 3 + 2] = p.z - this.rocket.position.z;
        }
        // 若不足 trailLength，则其余位置填充在末尾
        for (let i = this.trailPositions.length; i < this.trailLength; i++) {
            positions[i * 3] = 9999; // 放到很远处，看不见就行
            positions[i * 3 + 1] = 9999;
            positions[i * 3 + 2] = 9999;
        }

        this.trail.geometry.attributes.position.needsUpdate = true;

        // 随时间衰减尾迹整体不透明度
        this.trail.material.opacity = 0.7 * (this.velocity.y + 1.0);
    }

    explode() {
        // 移除火箭模型
        scene.remove(this.rocket);
        scene.remove(this.trail);

        // 显示爆炸粒子
        this.explosion.visible = true;

        // 将爆炸粒子整体移到火箭消失的位置
        this.explosion.position.copy(this.rocket.position);

        this.isExploded = true;
        this.clock.start();
    }
}

/**
 * -------------------------------------------
 * 全局控制：每隔一段时间随机发射烟花
 * -------------------------------------------
 */
const fireworks = [];
let lastSpawnTime = 0;
function spawnFireworks(time) {
    // 真实烟花：发射频率不会太快，可以在0.5秒到3秒之间随机
    const interval = 1000 + Math.random() * 2000;
    if (time - lastSpawnTime > interval) {
        // 一次可以发射1~3个
        const count = 1 + Math.floor(Math.random() * 3);
        for (let i = 0; i < count; i++) {
            fireworks.push(new Firework());
        }
        lastSpawnTime = time;
    }
}

/**
 * -------------------------------------------
 * 动画循环
 * -------------------------------------------
 */
const clock = new THREE.Clock();
function animate() {
    requestAnimationFrame(animate);
    const delta = clock.getDelta(); // 距离上次帧的时间

    // 检查是否需要新发射烟花
    const currentTime = performance.now();
    spawnFireworks(currentTime);

    // 更新每个烟花
    for (let i = fireworks.length - 1; i >= 0; i--) {
        fireworks[i].update(delta);
        if (fireworks[i].dead) {
            // 移除
            scene.remove(fireworks[i].explosion);
            fireworks.splice(i, 1);
        }
    }

    composer.render();
}

animate();

/**
 * -------------------------------------------
 * 窗口自适应
 * -------------------------------------------
 */
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>

主要改进思路说明

上升阶段与爆炸阶段分离
- 使用一个简单的球体或 Points 充当“火箭”，负责上升轨迹及尾迹；
- 一旦到达目标高度或速度衰减至一定程度，就移除火箭本体并显示“爆炸”粒子。
火箭尾迹
- 用一个 Points 管理尾迹粒子，记录火箭过去的若干位置，并让这些粒子保持在相对于火箭的偏移量上，看起来就像一条拖尾。
- 尾迹颜色一般偏白黄，可稍微加透明度衰减，看起来更像真实火光。
爆炸形状
- 用随机球面分布（或加入一些倾斜、扁平、环形等变体）生成大量粒子的初速度。
- 让粒子在“爆心”位置作球形扩散，并带有重力下坠和空气阻力衰减。
- 爆炸持续时间常常只有几秒，过后就逐渐消失。
随机发射频率
- 给一次发射设定一定随机间隔，这样既能模拟真实烟花的节奏，也防止屏幕上烟花密集到失真。
- 有时可以一次发射多枚（1~3枚或更多），就像烟花秀高峰时会同时升起多个火箭。
后期泛光 (Bloom) 调整
- 使用较适中的 bloomStrength、threshold 和 radius 参数，既能让烟花看起来炫目，又不至于过曝。
- 设备性能不好时，可以进一步降低粒子数量和泛光强度。

通过以上改动，可以让整体观感与真实的烟花秀更为接近。你还可以进一步对色彩、粒子数量、速度衰减系数、爆炸形状等作深度微调，或利用音频（模拟爆炸声、尾迹声）等增强沉浸感。祝你创作愉快!

真实烟花效果代码

问题

思考

回答

主要改进思路说明

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