three.js 源码注释（九十六）Cameras/CubeCamera.js

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以下代码是THREE.JS 源码文件中extras/Camera/CubeCamera.js文件的注释.

/**
 * Camera for rendering cube maps
 *- renders scene into axis-aligned cube
 *
 * @author alteredq / http://alteredqualia.com/
 */
/*
///CubeCamera方法根据 near, far ,cubeResolution 生成立方体相机.CubeCamera对象的功能函数采用
/// 定义构造的函数原型对象来实现. CubeCamera经常用来创建天空盒子.由六张图片拼接成一个场景.
*/
///<summary>CubeCamera</summary>
///<param name ="near" type="Number">指明相对于深度剪切面的近的距离，必须为正数,可选参数,如果未指定,初始化为0.1</param>
///<param name ="far" type="Number">指明相对于深度剪切面的远的距离，必须为正数,可选参数,如果未指定,初始化为2000</param>
///<param name ="cubeResolution" type="float">设置立方体的宽度</param>
///<returns type="Matrix4">返回PerspectiveCamera,透视投影相机.</returns>
THREE.CubeCamera = function ( near, far, cubeResolution ) {

THREE.Object3D.call( this );//调用Object3D对象的call方法,将原本属于Object3D的方法交给当前对象CubeCamera来使用.

var fov = 90, aspect = 1;

var cameraPX = new THREE.PerspectiveCamera( fov, aspect, near, far );//立方体的右侧镜头
cameraPX.up.set( 0, - 1, 0 );
cameraPX.lookAt( new THREE.Vector3( 1, 0, 0 ) );
this.add( cameraPX );

var cameraNX = new THREE.PerspectiveCamera( fov, aspect, near, far );//立方体的左侧镜头
cameraNX.up.set( 0, - 1, 0 );
cameraNX.lookAt( new THREE.Vector3( - 1, 0, 0 ) );
this.add( cameraNX );

var cameraPY = new THREE.PerspectiveCamera( fov, aspect, near, far );//立方体的前侧镜头
cameraPY.up.set( 0, 0, 1 );
cameraPY.lookAt( new THREE.Vector3( 0, 1, 0 ) );
this.add( cameraPY );

var cameraNY = new THREE.PerspectiveCamera( fov, aspect, near, far );//立方体的后侧镜头
cameraNY.up.set( 0, 0,222 - 1 );

cameraNY.lookAt( new 0THREE.Vector3( 0, - 1, 0 ) );
this.add( cameraNY );

var cameraPZ = new THREE.PerspectiveCamera( fov, aspect, near, far );//立方体的上侧镜头
cameraPZ.up.set( 0, - 1, 0 );
cameraPZ.lookAt( new THREE.Vector3( 0, 0, 1 ) );
this.add( cameraPZ );

var cameraNZ = new THREE.PerspectiveCamera( fov, aspect, near, far );//立方体的下侧镜头
cameraNZ.up.set( 0, - 1, 0 );
cameraNZ.lookAt( new THREE.Vector3( 0, 0, - 1 ) );
this.add( cameraNZ );

this.renderTarget = new THREE.WebGLRenderTargetCube( cubeResolution, cubeResolution, { format: THREE.RGBFormat, magFilter: THREE.LinearFilter, minFilter: THREE.LinearFilter } ); //调用WebGLRenderTargetCube()方法,渲染场景.
/*
///updateCubeMap方法更新渲染器和场景.
*/
///<summary>updateCubeMap</summary>
///<param name ="renderer" type="THREE.RenderTargetCube">目标立方体渲染器</param>
///<param name ="scene" type="THREE.Scene">场景</param>
///<returns type="Matrix4">返回PerspectiveCamera,透视投影相机.</returns>
this.updateCubeMap = function ( renderer, scene ) {

var renderTarget = this.renderTarget;
var generateMipmaps = renderTarget.generateMipmaps;

renderTarget.generateMipmaps = false;

renderTarget.activeCubeFace = 0;
renderer.render( scene, cameraPX, renderTarget );

renderTarget.activeCubeFace = 1;
renderer.render( scene, cameraNX, renderTarget );

renderTarget.activeCubeFace = 2;
renderer.render( scene, cameraPY, renderTarget );

renderTarget.activeCubeFace = 3;
renderer.render( scene, cameraNY, renderTarget );

renderTarget.activeCubeFace = 4;
renderer.render( scene, cameraPZ, renderTarget );

renderTarget.generateMipmaps = generateMipmaps;

renderTarget.activeCubeFace = 5;
renderer.render( scene, cameraNZ, renderTarget );

};

};
/*************************************************
****下面是CubeCamera对象的方法属性定义,继承自Object3D
**************************************************/
THREE.CubeCamera.prototype = Object.create( THREE.Object3D.prototype );

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以下代码是THREE.JS 源码文件中extras/Camera/CubeCamera.js文件的注释.

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three.js 源码注释（九十六）Cameras/CubeCamera.js

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