粒子轨迹mesh队列版，HTML代码在线实时编辑、实时预览

index.html

            
                1
2
3
4
5
6
7
8
9
10
11
12
13

            
            <!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <style>
    body { margin: 0; }
    canvas { display: block; }
  </style>
</head>
<body>
  <script src="./main.js"></script>
</body>
</html>

编辑器加载中

main.js

            
                1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84

            
            import * as THREE from 'three';
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js';

// 初始化
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, window.innerWidth/window.innerHeight, 0.1, 1000);
camera.position.set(20, 20, 20);
const renderer = new THREE.WebGLRenderer({antialias: true});
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

// 交互
const controls = new OrbitControls( camera, renderer.domElement );

// 辅助线
const helper = new THREE.AxesHelper(30)
scene.add(helper);

// 创建路径曲线
const start = new THREE.Vector3(0, 0, 0);
const end = new THREE.Vector3(20, 0, 0);
// 可加入中间控制点提升曲线弯曲效果
const mid = new THREE.Vector3(10, 15, 0);
// 样条曲线：经过给定点，并包含插值算法的平滑曲线
const curve = new THREE.CatmullRomCurve3([start, mid, end]);

// 绘制路径线（可视化）
const curvePoints = curve.getPoints(100);
const geometry = new THREE.BufferGeometry().setFromPoints(curvePoints);
const material = new THREE.LineBasicMaterial({ color: 0x00ffff });
const curveLine = new THREE.Line(geometry, material);
scene.add(curveLine);

// 飞线点对象（小球或粒子）
const flyGeometry = new THREE.SphereGeometry(0.3, 16, 16);
const flyMaterial = new THREE.MeshBasicMaterial({ color: 0xff0000 });
const flyObject = new THREE.Mesh(flyGeometry, flyMaterial);
scene.add(flyObject);

// 粒子拖尾/尾迹
const trailGroup = new THREE.Group();
scene.add(trailGroup);

const trailLength = 15;
// 创建粒子并添加到Group
for (let i = 0; i < trailLength; i++) {
  const g = new THREE.SphereGeometry(0.2, 8, 8);
  const m = new THREE.MeshBasicMaterial({
    color: 0xff0000,
    opacity: 1,
    transparent: true
  });
  const dot = new THREE.Mesh(g, m);
  trailGroup.add(dot);
}

// 动画控制变量
let t = 0;
const speed = 0.01; // 每帧前进的量

function animate() {
  requestAnimationFrame(animate);

  // t 控制在 0~1 区间来沿曲线移动
  t += speed;
  if (t > 1) t = 0;

  const point = curve.getPoint(t);
  flyObject.position.copy(point);

  // 从尾部开始更新粒子位置
  const children = trailGroup.children;
  for (let i = children.length - 1; i > 0; i--) {
    children[i].position.copy(children[i - 1].position);
    children[i].material.opacity = 1 - i / children.length;
  }
  // 将队头位置更新为飞行物的位置
  children[0].position.copy(flyObject.position);
  children[0].material.opacity = 1.0;
  
  controls.update();
  renderer.render(scene, camera);
}
animate();

编辑器加载中

package.json

注意：新添加的依赖包首次加载可能会报错，稍后再次刷新即可

            
                1
2
3
4
5

            
            {
  "dependencies": {
    "three": "0.173.0"
  }
}

编辑器加载中