图片纹理
maya中的UV测试
uv就是把物体的表面全部展开,添加图片,像皮肤一样
这边我加载一个png图片
分割六个面,组合图片
THREE中的纹理构造函数
THREE.Texture(image,mapping,wrapS,wrapT,magFilter,minFilter,format,type,anisotropy);
参数 | 含义 |
image | 图片类型 |
mapping | 图像将如何应用到物体(对象),默认值是THREE.UVMapping对象类型,UV坐标被用于纹理映射 |
wraps | x轴纹理的回环方式,当纹理宽度小于需要贴图的平面的宽度的时候,平面剩下的部分应该以何种方式贴图问题 |
wrapT | y轴回环方式 |
magFilter | 过滤方式,OpenGL的基本概念 |
minFilter | 过滤方式,OpenGL的基本概念 |
format | 图片格式有RGBAFormat,RGBAFormat等 |
type | 表示存储纹理内存的每一个字节的格式,int、float等,这里默认无符号型(THREE.UnsignedByte Type) |
anisotropy | 各向异性过滤,为了纹理效果更好,消耗更多的内存、cpu、gpu |
为平面赋予纹理二维UV坐标
geometry.vertices[0].uv=new THREE.Vector2(0,0); geometry.vertices[1].uv=new THREE.Vector2(1,0); geometry.vertices[2].uv=new THREE.Vector2(1,1); geometry.vertices[3].uv=new THREE.Vector2(0,1);//逆时针
loadertexture函数
var texture=THREE.ImageUtils.loadTexture("M.png",null,function (t) { });//加载图片
参数 | 含义 |
第一个参数路径 | 相对路径 |
第二个参数null | 纹理坐标参数覆盖geometry的参数 |
第三个参数function(t) | 回调函数,成功加载纹理后需要执行的函数,参数为texture |
指定材质纹理映射
var material=new THREE.MeshBasicMaterial({map:texture});//纹理映射 mesh = new THREE.Mesh( geometry,material);
代码重构
1.渲染背景橙黄色0xfd971f,背景颜色。
renderer.setClearColor(0xfd971f, 1.0);//橙黄色背景利于观察正方体
2.透视相机就位
var camera; function initCamera() { camera = new THREE.PerspectiveCamera(120, width/height, 1, 1000); camera.position.x = 0; camera.position.y = 0; camera.position.z = 700; camera.up.x = 0;//相机朝向位置 camera.up.y = 1; camera.up.z = 0; camera.lookAt(new THREE.Vector3(0,0,0)); }
3.白色环境光就位
function initLight() { var light=new THREE.AmbientLight(0xffffff);//白色环境光,无处不在 var light_help=new THREE.SphereGeometry(16,16,16); light.add(new THREE.Mesh(light_help,new THREE.MeshBasicMaterial({color:0xffffff})));//白色 scene.add(light); }
4.创建box
var mesh=null;//全局变量 function initObject() { var geometry = new THREE.CubeGeometry(300,300,300);//几何体 var material = new THREE.MeshLambertMaterial( { color:0xFFFFFF} );//白色 mesh = new THREE.Mesh( geometry,material); mesh.position = new THREE.Vector3(0,0,0); scene.add(mesh); }
5.纹理贴图准备,重构几何体材质代码
var mesh=null;//全局变量 function initObject() { var geometry = new THREE.CubeGeometry(300,300,300);//几何体 geometry.vertices[0].uv=new THREE.Vector2(0,0); geometry.vertices[1].uv=new THREE.Vector2(1,0); geometry.vertices[2].uv=new THREE.Vector2(1,1); geometry.vertices[3].uv=new THREE.Vector2(0,1); var texture=THREE.ImageUtils.loadTexture("demo1.jpg",null,function (t) { }); var material=new THREE.MeshBasicMaterial({map:texture});//纹理映射 //var material = new THREE.MeshLambertMaterial( { color:0xFFFFFF} );//白色 mesh = new THREE.Mesh( geometry,material); mesh.position = new THREE.Vector3(0,0,0); scene.add(mesh); }
6.为了利于观察,循环渲染加上box旋转
function animation() { mesh.rotation.y+=0.01;//绕y轴旋转 renderer.render(scene, camera); requestAnimationFrame(animation);//递归调用 stats.update();//fps }
测试的图片纹理
ok,奈斯运行看效果!