three.js 源码注释（三十）CamerasPerspectiveCamera.js

概述商域无疆 (http://blog.csdn.net/omni360/)本文遵循“署名-非商业用途-保持一致”创作公用协议转载请保留此句：商域无疆 - 本博客专注于敏捷开发及移动和物联设备研究：数据可视化、GOLANG、Html5、WEBGL、THREE.JS，否则，出自本博客的文章拒绝转载或再转载

商域无疆 (http://blog.csdn.net/omni360/)

本文遵守“署名-非商业用处-保持1致”创作公用协议

转载请保存此句：商域无疆 -  本博客专注于 敏捷开发及移动和物联装备研究：数据可视化、GolANG、HTML5、WEBGL、THREE.Js，否则，出自本博客的文章谢绝转载或再转载，谢谢合作。

俺也是刚开始学,好多地儿肯定不对还请见谅.

以下代码是THREE.Js 源码文件中Cameras/PerspectiveCamera.Js文件的注释.

更多更新在 : https://github.com/omni360/three.Js.sourcecode

/** * @author mrdoob / http://mrdoob.com/ * @author greggman / http://games.greggman.com/ * @author zz85 / http://www.lab4games.net/zz85/blog *//*///PerspectiveCamera方法根据 fov,aspect,near,far 生成透视投影相机.PerspectiveCamera对象的功能函数采取/// 定义构造的函数原型对象来实现.*////<summary>PerspectiveCamera</summary>///<param name ="fov" type="Number">指明相机的可视角度,可选参数,如果未指定,初始化为50</param>///<param name ="aspect" type="Number">指明相机可视范围的长宽比,初始化为1</param>///<param name ="near" type="Number">指明相对深度剪切面的近的距离，必须为正数,初始化为0.1</param>///<param name ="far" type="Number">指明相对深度剪切面的远的距离，必须为正数,初始化为2000</param>///<returns type="Matrix4">返回PerspectiveCamera,透视投影相机.</returns>THREE.PerspectiveCamera = function ( fov,far ) { THREE.Camera.call( this ); //调用Camera对象的call方法,将本来属于Camera的方法交给当前对象PerspectiveCamera来使用. this.fov = fov !== undefined ? fov : 50; //指明相机的可视角度,初始化为50 this.aspect = aspect !== undefined ? aspect : 1; //指明相机可视范围的长宽比,初始化为1 this.near = near !== undefined ? near : 0.1; //指明相对深度剪切面的近的距离，必须为正数,初始化为0.1 this.far = far !== undefined ? far : 2000; //指明相对深度剪切面的近的距离，必须为正数,初始化为2000 this.updateProjectionMatrix(); //调用updateProjectionMatrix方法,更新相机的投影矩阵.};/******************************************************************************************下面是PerspectiveCamera对象提供的功能函数定义,1部份通过prototype继承自Camera方法***************************************************************************************/THREE.PerspectiveCamera.prototype = Object.create( THREE.Camera.prototype );/*///setLens方法根据 焦距 focalLength,画幅大小 frameHeight 更新透视投影相机的视野.*////<summary>setLens</summary>///<param name ="focalLength" type="Number">焦距</param>///<param name ="frameHeight" type="Number">画幅大小</param>///<returns type="Matrix4">返回更新视野的透视投影相机.</returns>/** * Uses Focal Length (in mm) to estimate and set FOV * 35mm (fullframe) camera is used if frame size is not specifIEd; * 使用焦距(单位毫米)设置相机时,如果画幅大小没有指定,默许使用FOV(视野)35mm(全画幅)相机,* Formula based on http://www.bobatkins.com/photography/technical/fIEld_of_vIEw.HTML */THREE.PerspectiveCamera.prototype.setLens = function ( focalLength,frameHeight ) { if ( frameHeight === undefined ) frameHeight = 24; //如果画幅大小没有指定,初始化为24,全画幅相机 this.fov = 2 * THREE.Math.radToDeg( Math.atan( frameHeight / ( focalLength * 2 ) ) ); //更新透视投影相机的视野 this.updateProjectionMatrix(); //更新投影矩阵}/*///setVIEwOffset方法为1个大的平截头体设置视口偏移,这个方法在多显示器,多台机器,显示器矩阵上利用非常有效*////<summary>setVIEwOffset</summary>///<param name ="fullWIDth" type="Number">1个超大的摄像机场景的总宽度</param>///<param name ="fullHeight" type="Number">1个超大的摄像机场景的总高度</param>///<param name ="x" type="Number">当前摄像机左上角点的x坐标在网格内的起始点</param>///<param name ="y" type="Number">当前摄像机左上角点的y坐标在网格内的起始点</param>///<param name ="wIDth" type="Number">当前摄像机的宽度</param>///<param name ="height" type="Number">当前摄像机的高度</param>///<returns type="Matrix4">返回更新透视投影矩阵的透视投影相机.</returns>/** * Sets an offset in a larger frustum. This is useful for multi-window or * multi-monitor/multi-machine setups. * 为1个大的平截头体设置视口偏移,显示器矩阵上利用非常有效. * * For example,if you have 3x2 monitors and each monitor is 1920x1080 and * the monitors are in grID like this * 比如,你有3x2 个显示器,每一个显示器的分辨率是1920x1080,组成的显示器矩阵向下面的网格 * * +---+---+---+ * | A | B | C | * +---+---+---+ * | D | E | F | * +---+---+---+ * * then for each monitor you would call it like this * 然后,你可以向下面这样为每台显示器调用setoffset()方法,让每一个显示器显示画布的1部份. * * var w = 1920; * var h = 1080; * var fullWIDth = w * 3; * var fullHeight = h * 2; * * --A-- * camera.setoffset( fullWIDth,fullHeight,w * 0,h * 0,w,h ); * --B-- * camera.setoffset( fullWIDth,w * 1,h ); * --C-- * camera.setoffset( fullWIDth,w * 2,h ); * --D-- * camera.setoffset( fullWIDth,h * 1,h ); * --E-- * camera.setoffset( fullWIDth,h ); * --F-- * camera.setoffset( fullWIDth,h ); * * Note there is no reason monitors have to be the same size or in a grID. * 注意,有可能,这些显示器不是一样的尺寸.所以你可以根据需要设置你想要的各种方式. */THREE.PerspectiveCamera.prototype.setVIEwOffset = function ( fullWIDth,x,y,wIDth,height ) { this.fullWIDth = fullWIDth; //1个超大的摄像机场景的总宽度 this.fullHeight = fullHeight; //1个超大的摄像机场景的总高度 this.x = x; //当前摄像机左上角点的x坐标在网格内的起始点 this.y = y; //当前摄像机左上角点的y坐标在网格内的起始点 this.wIDth = wIDth; //当前摄像机的宽度 this.height = height; //当前摄像机的高度 this.updateProjectionMatrix(); //返回更新透视投影矩阵的透视投影相机};/*///updateProjectionMatrix方法返回透视投影相机的可视边界的矩阵.当相机的参数被更改后,必须调用此参数.*////<summary>updateProjectionMatrix</summary>///<returns type="OrthographicCamera">返回新的OrthographicCamera对象</returns>THREE.PerspectiveCamera.prototype.updateProjectionMatrix = function () { if ( this.fullWIDth ) { var aspect = this.fullWIDth / this.fullHeight; var top = Math.tan( THREE.Math.degToRad( this.fov * 0.5 ) ) * this.near; var bottom = - top; var left = aspect * bottom; var right = aspect * top; var wIDth = Math.abs( right - left ); var height = Math.abs( top - bottom ); this.projectionMatrix.makeFrustum( left + this.x * wIDth / this.fullWIDth,left + ( this.x + this.wIDth ) * wIDth / this.fullWIDth,top - ( this.y + this.height ) * height / this.fullHeight,top - this.y * height / this.fullHeight,this.near,this.far ); } else { this.projectionMatrix.makePerspective( this.fov,this.aspect,this.far ); }};/*clone方法///clone方法克隆PerspectiveCamera对象*////<summary>clone</summary>///<returns type="PerspectiveCamera">返回克隆的PerspectiveCamera对象</returns> THREE.PerspectiveCamera.prototype.clone = function () { var camera = new THREE.PerspectiveCamera(); THREE.Camera.prototype.clone.call( this,camera ); //调用THREE.Camera.Clone(camera)方法,克隆透视投影相机对象 camera.fov = this.fov; //将透视投影相机的 fov 属性值复制 camera.aspect = this.aspect; //将透视投影相机的 aspect 属性值复制 camera.near = this.near; //将透视投影相机的 near 属性值复制 camera.far = this.far; //将透视投影相机的 far 属性值复制 return camera; //返回克隆的PerspectiveCamera对象};

，否则，出自本博客的文章谢绝转载或再转载，谢谢合作。

以下代码是THREE.Js 源码文件中Cameras/PerspectiveCamera.Js文件的注释.

更多更新在 : https://github.com/omni360/three.Js.sourcecode

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