threejs(8)-详解光线投射与物体交互

详解光线投射与物体交互

import * as THREE from "three";
// 导入轨道控制器
import { OrbitControls } from "three/examples/jsm/controls/OrbitControls";
// 导入动画库
import gsap from "gsap";
// 导入dat.gui
import * as dat from "dat.gui";

// 目标：raycaster

const gui = new dat.GUI();
// 1、创建场景
const scene = new THREE.Scene();

// 2、创建相机
const camera = new THREE.PerspectiveCamera(
  75,
  window.innerWidth / window.innerHeight,
  0.1,
  300
);

const textureLoader = new THREE.TextureLoader();
const particlesTexture = textureLoader.load("./textures/particles/1.png");
// 设置相机位置
camera.position.set(0, 0, 20);
scene.add(camera);

const cubeGeometry = new THREE.BoxBufferGeometry(1, 1, 1);
const material = new THREE.MeshBasicMaterial({
  wireframe: true,
});
const redMaterial = new THREE.MeshBasicMaterial({
  color: "#ff0000",
});

// 1000立方体
let cubeArr = [];
for (let i = -5; i < 5; i++) {
  for (let j = -5; j < 5; j++) {
    for (let z = -5; z < 5; z++) {
      const cube = new THREE.Mesh(cubeGeometry, material);
      cube.position.set(i, j, z);
      scene.add(cube);
      cubeArr.push(cube);
    }
  }
}

// 创建投射光线对象
const raycaster = new THREE.Raycaster();

// 鼠标的位置对象
const mouse = new THREE.Vector2();

// 监听鼠标的位置
// window.addEventListener("mousemove", (event) => {
//   //   console.log(event);
//   mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
//   mouse.y = -((event.clientY / window.innerHeight) * 2 - 1);
//   raycaster.setFromCamera(mouse, camera);
//   let result = raycaster.intersectObjects(cubeArr);
//   //   console.log(result);
//   //   result[0].object.material = redMaterial;
//   result.forEach((item) => {
//     item.object.material = redMaterial;
//   });
// });

// 监听鼠标的位置
window.addEventListener("click", (event) => {
  //   console.log(event);
  mouse.x = (event.clientX / window.innerWidth) * 2 - 1; // -1 1
  mouse.y = -((event.clientY / window.innerHeight) * 2 - 1);// -1 1
  raycaster.setFromCamera(mouse, camera);
  let result = raycaster.intersectObjects(cubeArr);
  //   console.log(result);
  //   result[0].object.material = redMaterial;
  result.forEach((item) => {
    item.object.material = redMaterial;
  });
});

// 初始化渲染器
const renderer = new THREE.WebGLRenderer();
// 设置渲染的尺寸大小
renderer.setSize(window.innerWidth, window.innerHeight);
// 开启场景中的阴影贴图
renderer.shadowMap.enabled = true;
renderer.physicallyCorrectLights = true;

// console.log(renderer);
// 将webgl渲染的canvas内容添加到body
document.body.appendChild(renderer.domElement);

// // 使用渲染器，通过相机将场景渲染进来
// renderer.render(scene, camera);

// 创建轨道控制器
const controls = new OrbitControls(camera, renderer.domElement);
// 设置控制器阻尼，让控制器更有真实效果,必须在动画循环里调用.update()。
controls.enableDamping = true;

// 添加坐标轴辅助器
const axesHelper = new THREE.AxesHelper(5);
scene.add(axesHelper);
// 设置时钟
const clock = new THREE.Clock();

function render() {
  let time = clock.getElapsedTime();

  controls.update();
  renderer.render(scene, camera);
  //   渲染下一帧的时候就会调用render函数
  requestAnimationFrame(render);
}

render();

// 监听画面变化，更新渲染画面
window.addEventListener("resize", () => {
  //   console.log("画面变化了");

  // 更新摄像头
  camera.aspect = window.innerWidth / window.innerHeight;
  //   更新摄像机的投影矩阵
  camera.updateProjectionMatrix();

  //   更新渲染器
  renderer.setSize(window.innerWidth, window.innerHeight);
  //   设置渲染器的像素比
  renderer.setPixelRatio(window.devicePixelRatio);
});

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
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135