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本章节主要涉及的知识点是：
1、canvas绘制（绘制线、曲线）
2、threeJS中处理2个挨得极近的物体
3、纹理的控制（纹理的偏移控制）
4、精灵材质+canvas作为纹理的运用
其他的都是一些基础的知识
效果录屏：
代码：
<html>
<head>
<title>纹理偏移+Sprite标签</title>
<style>
body {
background-color: #000;
margin: 0px;
overflow: hidden;
}
#WebGL {
width: 100%;
height: 100%;
position: absolute;
left: 0;
top: 0;
z-index: 999;
}
</style>
</head>
<body>
<div id="WebGL"></div>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.js"></script>
<script src="../../../build/three.js"></script>
<script src="../../../examples/js/controls/OrbitControls.js"></script>
<script src="./texture.js"></script>
</body>
</html>
'use strict';
var container, camera, scene, renderer, geometry, material, controls; //常用变量
var spotLight, mesh_sphere; //自定义对象变量
var target = new THREE.Vector3(0, 30, 0);
var webGLW = $('#WebGL').width();
var webGLH = $('#WebGL').height();
var textureLoader = new THREE.TextureLoader(); //纹理加载器
init();
animate();
function init() {
container = document.getElementById('WebGL');
rendererScene(); //场景渲染
sceneBackground();
camera = new THREE.PerspectiveCamera(40, window.innerWidth / window.innerHeight, 1, 10000);
camera.position.set(0, 50, 200);
camera.lookAt(target);
plane() //// 地面
lights(); //灯光：聚光灯
addMovePlane(scene); //推荐偏移的平面和圆
loadModel(); //添加模型
OrbitControls(camera, renderer); //OrbitControls控件模块
window.addEventListener('resize', onWindowResize, false); //监听屏幕变化
}
function sceneBackground() {
scene = new THREE.Scene();
// scene.background = new THREE.Color(0xcfcfcf);//可以用图片代替作为背景
var path = '../image/sky/';
var format = '.jpg';
new THREE.CubeTextureLoader().load([
path + 'px' + format, path + 'nx' + format, //右左
path + 'py' + format, path + 'ny' + format, //上下
path + 'pz' + format, path + 'nz' + format //前后
], function (res) {
scene.background = res;
});
// // scene.fog = new THREE.Fog(0xa0a0a0, 200, 1000); //雾
}
function plane() {
texture_plane = textureLoader.load('../image/textureOffset.png');
texture_plane.wrap = texture_plane.wrapT = THREE.RepeatWrapping; //平铺重复
texture_plane.anisotropy = renderer.capabilities.getMaxAnisotropy();
// 地面
let geometry = new THREE.PlaneBufferGeometry(200, 200);
let grid_mesh = new THREE.Mesh(geometry, new THREE.MeshPhongMaterial({
color: 0x999999,
// depthWrite: false
}));
grid_mesh.rotation.x = -Math.PI / 2;
grid_mesh.receiveShadow = true;
scene.add(grid_mesh);
var grid = new THREE.GridHelper(200, 20, 0x000000, 0x000000);
grid.material.opacity = 0.2;
grid.material.transparent = true;
scene.add(grid);
}
function lights() { //光影自己改哦
var ambient = new THREE.AmbientLight(0xffffff);
scene.add(ambient);
//聚光灯
// SpotLight( color：颜色, intensity：强度, distance：发光距离, angle：角度, penumbra：边缘范围, decay：衰减 )
spotLight = new THREE.SpotLight(0xffffff, 1);
spotLight.position.set(0, 120, 0);
spotLight.angle = Math.PI / 6;
spotLight.penumbra = 0.05; //边缘范围，反比
spotLight.decay = 2; //衰减系数，反比
spotLight.distance = 400; //发光距离
spotLight.castShadow = true; //阴影
spotLight.shadow.mapSize.width = 1024;
spotLight.shadow.mapSize.height = 1024;
spotLight.shadow.camera.near = 10; //近截面
spotLight.shadow.camera.far = 250;
scene.add(spotLight);
}
function lightsHelper(lightsObject) {
// 聚光灯显示助手SpotLightHelper( light:灯光, color：颜色 )
var lightHelper = new THREE.SpotLightHelper(lightsObject, 0xdfdfdf);
scene.add(lightHelper);
let mesh = new THREE.Mesh(new THREE.PlaneBufferGeometry(100, 100), new THREE.MeshPhongMaterial({
color: 0x9cfcf99,
depthWrite: false
}));
mesh.rotation.x = -Math.PI / 2;
mesh.position.set(0, -20, 0)
mesh.receiveShadow = true;
scene.add(mesh);
}
var texture_plane;
function addMovePlane(scene) {
// 背景平面
let geometry02 = new THREE.PlaneBufferGeometry(150, 100);
let plane_back = new THREE.Mesh(geometry02, new THREE.MeshPhongMaterial({
map: texture_plane,
transparent: true,
}));
plane_back.position.set(0, 50, -100);
plane_back.name = 'plane';
let plane_back_make =makeTextSprite(plane_back.name,{
fontsize: 80,
borderColor: {r:180, g:125, b:125, a:0.4},/* 边框颜色 */
backgroundColor: {r:255, g:255, b:255, a:0.9}/* 背景颜色 */
})
plane_back_make.center = new THREE.Vector2(0, 0);
plane_back_make.name='plane_back_make';
let plane_back_parameters=plane_back.geometry.parameters ;
plane_back_make.position.set(-(plane_back_parameters.width/2+15),plane_back.position.y , plane_back.position.z);
scene.add(plane_back,plane_back_make);
let circle = new THREE.Mesh(new THREE.CircleGeometry(60, 100, 100), new THREE.MeshPhongMaterial({
map: texture_plane,
transparent: true,
depthTest: false //关闭检测，让2个重叠的平面正确显示
}));
circle.rotation.x = -Math.PI / 2;
circle.name = 'circle';
scene.add(circle);
}
var texture_sphere;
function loadModel() { //模型
//圆球
texture_sphere = textureLoader.load('../image/textureOffset.png');
texture_sphere.wrap = texture_sphere.wrapT = THREE.RepeatWrapping; //平铺重复
mesh_sphere = new THREE.Mesh(
new THREE.SphereBufferGeometry(20, 20, 20),
new THREE.MeshBasicMaterial({
color: 0xffffff,
map: texture_sphere,
side: 2,
transparent: true,
// wireframe: true
})
);
mesh_sphere.position.set(0, 30, 0)
mesh_sphere.name = 'sphere';
let mesh_sphere_make =makeTextSprite(mesh_sphere.name,{
fontsize: 80,
borderColor: {r:180, g:125, b:125, a:0.4},/* 边框颜色 */
backgroundColor: {r:255, g:255, b:255, a:0.9}/* 背景颜色 */
})
mesh_sphere_make.center = new THREE.Vector2(0, 0);
mesh_sphere_make.name='mesh_sphere_make';
let mesh_sphere_parameters=mesh_sphere.geometry.parameters ;
mesh_sphere_make.position.set(-(mesh_sphere_parameters.radius+15),mesh_sphere.position.y , mesh_sphere.position.z);
scene.add(mesh_sphere,mesh_sphere_make);
}
/* 创建字体精灵 */
function makeTextSprite(message, parameters) {
if (parameters === undefined) parameters = {};
/* 字体 */
let fontface = parameters.hasOwnProperty("fontface") ?
parameters["fontface"] : "Arial";
/* 字体大小 */
let fontsize = parameters.hasOwnProperty("fontsize") ?
parameters["fontsize"] : 10;
/* 边框厚度 */
let borderThickness = parameters.hasOwnProperty("borderThickness") ?
parameters["borderThickness"] : 4;
/* 边框颜色 */
let borderColor = parameters.hasOwnProperty("borderColor") ?
parameters["borderColor"] : {
r: 0,
g: 0,
b: 0,
a: 1.0
};
/* 背景颜色 */
let backgroundColor = parameters.hasOwnProperty("backgroundColor") ?
parameters["backgroundColor"] : {
r: 255,
g: 255,
b: 255,
a: 1.0
};
/* 创建画布 */
let canvas = document.createElement('canvas');
let context = canvas.getContext('2d');
/* 字体加粗 */
context.font = "Bold " + fontsize + "px " + fontface;
/* 获取文字的大小数据，高度取决于文字的大小 */
let metrics = context.measureText(message);
console.log('文字metrics::',metrics);
let textWidth = metrics.width;
/* 背景颜色 */
context.fillStyle = "rgba(" + backgroundColor.r + "," + backgroundColor.g + "," +
backgroundColor.b + "," + backgroundColor.a + ")";
/* 边框的颜色 */
context.strokeStyle = "rgba(" + borderColor.r + "," + borderColor.g + "," +
borderColor.b + "," + borderColor.a + ")";
context.lineWidth = borderThickness;
/* 绘制圆角矩形 */
roundRect(context, borderThickness / 2, borderThickness / 2, textWidth + borderThickness, fontsize * 1.4 +
borderThickness, 30);
/* 字体颜色 */
context.fillStyle = "rgba(0, 0, 0, 1.0)";
context.fillText(message, borderThickness, fontsize + borderThickness);
/* 画布内容用于纹理贴图 */
let texture = new THREE.Texture(canvas);
texture.needsUpdate = true;
let spriteMaterial = new THREE.SpriteMaterial({
map: texture
});
let sprite = new THREE.Sprite(spriteMaterial);
console.log(sprite.spriteMaterial);
/* 缩放比例 */
sprite.scale.set(10, 5, 1);
return sprite;
}
/**
* @method 绘制圆角矩形
* @param {*} ctx canvas画布
* @param {*} x x位置
* @param {*} y y位置
* @param {*} w 宽
* @param {*} h 高
* @param {*} r 圆角的半径
*/
function roundRect(ctx, x, y, w, h, r) {
ctx.beginPath();
// 起始点（左上圆角处的直线位置）
ctx.moveTo(x + r, y);
// 矩形上宽线条（突出来一点）
ctx.lineTo(x + w*1.5 - r, y);
// 绘制左上圆角（二次贝塞尔曲线）
ctx.quadraticCurveTo(x + w, y, x + w, y + r);
// 右高线条
ctx.lineTo(x + w, y + h - r);
// 右下圆角
ctx.quadraticCurveTo(x + w, y + h, x + w - r, y + h);
// 左下线条
ctx.lineTo(x + r, y + h);
// 左下圆角
ctx.quadraticCurveTo(x, y + h, x, y + h - r);
// 左高线条
ctx.lineTo(x, y + r);
// 左上圆角
ctx.quadraticCurveTo(x, y, x + r, y);
ctx.closePath();
ctx.fill();
ctx.stroke();
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function rendererScene() {
renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.shadowMap.enabled = true;
renderer.shadowMap.type = THREE.PCFSoftShadowMap;
renderer.gammaInput = true;
renderer.gammaOutput = true;
container.appendChild(renderer.domElement);
}
function OrbitControls(camera, renderer) {
//OrbitControls控件操作模块
controls = new THREE.OrbitControls(camera, renderer.domElement);
controls.target = target; //控制的target
// controls.autoRotate = true; //是否自动旋转
// controls.autoRotateSpeed = 0.2; //自动旋转速度，正比
}
/* 数据更新 */
function updata() {
// 设置纹理偏移
var time = Date.now() * 0.004;
// texture_sphere.offset.y = (Math.sin(time)*0.1);//往返偏移
texture_sphere.offset.x += 0.001; //左右偏移
if (texture_sphere.offset.x >= 0.5) {
texture_sphere.offset.x = 0;
}
texture_plane.offset.y -= 0.005;
}
function animate() {
requestAnimationFrame(animate);
if (controls) controls.update();
updata();
renderer.render(scene, camera);
};