/** * @author mrdoob / http://mrdoob.com/ * @author mikael emtinger / http://gomo.se/ * @author WestLangley / http://github.com/WestLangley */ /* ///Camera是相機對象的抽象基類,當創(chuàng)建相機時都從這個類繼承.Camera對象的功能函數(shù)采取定義構(gòu)造的函數(shù)原型對象來實現(xiàn). */ ///<summary>Camera</summary> THREE.Camera = function () { THREE.Object3D.call( this ); //調(diào)用Object3D對象的call方法,將本來屬于Object3D的方法交給當前對象Camera來使用. this.matrixWorldInverse = new THREE.Matrix4(); //為相機設置屬性matrixWorldInverse,這是matrixWorld的逆矩陣,matrixWorld包括相機在世界坐標系的變換矩陣 this.projectionMatrix = new THREE.Matrix4(); //為相機設置屬性projectionMatrix,包括相機的投影矩陣 }; /************************************************* ****下面是Camera對象的方法屬性定義,繼承自Object3D **************************************************/ THREE.Camera.prototype = Object.create( THREE.Object3D.prototype ); //Camrea對象從THREE.Objec3D的原型繼承所有屬性方法 /* ///lookAt方法用來旋轉(zhuǎn)相機對象,并將對象面對空間中的點(參數(shù)vector) */ ///<summary>lookAt</summary> ///<param name ="vector" type="Vector">Vector3對象</param> ///<returns type="Camera">返回新的Camera對象</returns> THREE.Camera.prototype.lookAt = function () { // This routine does not support cameras with rotated and/or translated parent(s) //TODO: 這個程序不支持Camera攝像機的旋轉(zhuǎn)和變換??英語不好,啥意思? var m1 = new THREE.Matrix4(); return function ( vector ) { m1.lookAt( this.position, vector, this.up ); //調(diào)用THREE.Matrix4.lookAt()方法 this.quaternion.setFromRotationMatrix( m1 ); //利用旋轉(zhuǎn)矩陣 }; }(); /*clone方法 ///clone方法克隆Camera對象, */ ///<summary>clone</summary> ///<param name ="camera" type="Camera">Camera對象</param> ///<returns type="Camera">返回克隆的Camera對象</returns> THREE.Camera.prototype.clone = function ( camera ) { if ( camera === undefined ) camera = new THREE.Camera(); THREE.Object3D.prototype.clone.call( this, camera ); //調(diào)用THREE.Object3D.Clone(camera)方法,克隆相機對象 camera.matrixWorldInverse.copy( this.matrixWorldInverse ); //將相機的matrixWorldInverse屬性值復制 camera.projectionMatrix.copy( this.projectionMatrix ); //將相機的projectionMatrix屬性值復制 return camera; //返回克隆的Camera對象 };