three 基础库
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<!DOCTYPE html>
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<html>
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<head>
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<title>Threejs鼠标点击场景对象获取对象信息,Threejs使用Raycaster拾取对象信息</title>
<meta charset="UTF-8">
<script type="text/javascript" src="libs/statistics.js"></script>
<script type="text/javascript" src="libs/steak.js"></script>
<script type="text/javascript" src="libs/three.js"></script>
<script type="text/javascript" src="libs/OrbitControls.js"></script>
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<style>
body {
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margin: 0;
overflow: hidden;
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}
</style>
</head>
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<body>
<div id="dom"></div>
<script type="text/javascript">
var camera;
var renderer;
var length = 36;
var ws = 2;
var graph = [];
var mesh = [];
function init() {
// 创建一个场景,它将包含我们所有的元素,如物体,相机和灯光。
var scene = new THREE.Scene();
var urls = [
'assets/bgImage/skyBox4/posx.jpg',
'assets/bgImage/skyBox4/negx.jpg',
'assets/bgImage/skyBox4/posy.jpg',
'assets/bgImage/skyBox4/negy.jpg',
'assets/bgImage/skyBox4/posz.jpg',
'assets/bgImage/skyBox4/negz.jpg'
];
var cubeLoader = new THREE.CubeTextureLoader();
scene.background = cubeLoader.load(urls);
// 创建一个摄像机,它定义了我们正在看的地方
camera = new THREE.PerspectiveCamera(40, window.innerWidth / window.innerHeight, 0.1, 1000);
// 将摄像机对准场景的中心
camera.position.x = 60;
camera.position.y = 35;
camera.position.z = 60;
camera.lookAt(scene.position);
var orbit = new THREE.OrbitControls(camera);
// 创建一个渲染器并设置大小,WebGLRenderer将会使用电脑显卡来渲染场景
// initialize basic renderer
renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
// 将平面添加到场景中
var plane = createPlaneGeometryBasicMaterial();
scene.add(plane);
// 在屏幕上显示坐标轴
var axes = new THREE.AxesHelper(100);
scene.add(axes);
scene.add(new THREE.AmbientLight(0x666666));
scene.add(new THREE.AmbientLight("#ffffff", 1));
document.getElementById("dom").appendChild(renderer.domElement);
initGround();
initGrid();
// 启动动画
renderScene();
// 创建一个地面
function createPlaneGeometryBasicMaterial() {
var textureLoader = new THREE.TextureLoader();
var cubeMaterial = new THREE.MeshStandardMaterial({
map: textureLoader.load("assets/textures/cd.jpg"),
});
cubeMaterial.map.wrapS = THREE.RepeatWrapping;
cubeMaterial.map.wrapT = THREE.RepeatWrapping;
cubeMaterial.map.repeat.set(18, 18)
// 创建地平面并设置大小
var planeGeometry = new THREE.PlaneGeometry(500, 500);
var plane = new THREE.Mesh(planeGeometry, cubeMaterial);
// 设置平面位置并旋转
plane.rotation.x = -0.5 * Math.PI;
plane.position.x = 0;
plane.position.z = 0;
return plane;
}
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// 初始化线路
function initLine(pArr) {
var points = [];
var geometry = new THREE.Geometry();
for (var i = 0; i < pArr.length; i++) {
var randomX = pArr[i].x;
var randomY = pArr[i].y;
var randomZ = pArr[i].z;
var vector = new THREE.Vector3(randomX, randomY, randomZ);
geometry.vertices.push(vector);
points.push(vector);
}
var material = new THREE.LineBasicMaterial({
color: 0x0000FF
});
var line = new THREE.Line(geometry, material);
scene.add(line);
return points;
}
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// 绘制路网
function initGround() {
var geometry = new THREE.Geometry();
geometry.vertices.push(new THREE.Vector3(0, 0, 0));
geometry.vertices.push(new THREE.Vector3(length, 0, 0));
for (var i = 0; i <= length / ws; i++) {
var material = new THREE.LineBasicMaterial({
color: 0x808080
});
var line = new THREE.Line(geometry, material);
line.position.z = i * ws;
scene.add(line);
var line = new THREE.Line(geometry, material);
line.position.x = i * ws;
line.position.z = length;
line.rotation.y = 90 * Math.PI / 180;
scene.add(line);
}
}
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// 初始化障碍物
function initGrid() {
for (var i = 0; i < length / ws; i++) {
var nodeRow = [];
for (var j = 0; j < length / ws; j++) {
var salt = Math.random() * 7;
if (salt > 2) {
nodeRow.push(1);
} else {
nodeRow.push(0);
}
if (salt <= 2) {
var cube = new THREE.Mesh(new THREE.CubeGeometry(1, 1, 1), new THREE.MeshBasicMaterial({
color: 0xC0C0C0
}));
let x = ws * j + ws / 2;
let z = ws * i + ws / 2;
cube.position.set(x, 1.2, z);
scene.add(cube);
mesh.push(cube);
}
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}
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graph.push(nodeRow);
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}
}
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document.addEventListener('click', onDocumentMouseDown, false);
function onDocumentMouseDown(event) {
// 点击屏幕创建一个向量
var vector = new THREE.Vector3((event.clientX / window.innerWidth) * 2 - 1, -(event.clientY / window
.innerHeight) * 2 + 1, 0.5);
vector = vector.unproject(camera); // 将屏幕的坐标转换成三维场景中的坐标
var raycaster = new THREE.Raycaster(camera.position, vector.sub(camera.position).normalize());
var intersects = raycaster.intersectObjects(mesh, true);
if (intersects.length > 0) {
intersects[0].object.material.color.set("#ff0000");
alert(JSON.stringify(intersects[0]))
}
}
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// 动画渲染
var step = 5;
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function renderScene() {
orbit.update();
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// 使用requestAnimationFrame函数进行渲染
requestAnimationFrame(renderScene);
renderer.render(scene, camera);
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}
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// 渲染的场景
renderer.render(scene, camera);
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}
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window.onload = init;
function onResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
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}
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// 监听调整大小事件
window.addEventListener('resize', onResize, false);
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</script>
</body>
</html>