three.js 源码注释（二十二）Core/Object3D.js
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以下代码是THREE.JS 源码文件中Core/Object3D.js文件的注释.
更多更新在 : https://github.com/omni360/three.js.sourcecode
/**
* @author mrdoob / http://mrdoob.com/
* @author mikael emtinger / http://gomo.se/
* @author alteredq / http://alteredqualia.com/
* @author WestLangley / http://github.com/WestLangley
*/
/*
///Object3D是场景中图形对象的基类.Object3D对象的功能函数采用定义构造的函数原型对象来实现.
*/
///Object3D
THREE.Object3D = function () {
/****************************************
****下面是Object3D对象的属性定义
****************************************/
this.id = THREE.Object3DIdCount ++; //Object3D对象id属性.
this.uuid = THREE.Math.generateUUID(); //调用THREE.Math.generateUUID()方法,Object3D对象uuid(通用唯一识别码)属性,
this.name = ''; //Object3D对象name属性,可以为当前对象定义一个名称,初始化为''
this.parent = undefined; //Object3D对象parent属性,初始化为undefined.
this.children = []; //Object3D对象children属性,初始化为[].
this.up = THREE.Object3D.DefaultUp.clone(); ////Object3D对象up属性,当前对象的上方,初始化为THREE.Vector3( 0, 1, 0 )
var scope = this;
var position = new THREE.Vector3();
var rotation = new THREE.Euler();
var quaternion = new THREE.Quaternion();
var scale = new THREE.Vector3( 1, 1, 1 );
rotation.onChange( function () {
quaternion.setFromEuler( rotation, false ); //给对象的rotation属性绑定setFromEuler()方法,当rotation属性值更改,调用setFromEuler()方法
} );
quaternion.onChange( function () {
rotation.setFromQuaternion( quaternion, undefined, false ); //给对象的quaternion属性绑定setFromQuaternion()方法,当rotation属性值更改,调用setFromEuler()方法
} );
Object.defineProperties( this, {
position: { //Object3D对象position属性
enumerable: true,
value: position
},
rotation: { //Object3D对象rotation属性,以弧度为单位
enumerable: true,
value: rotation
},
quaternion: { //Object3D对象quaternion属性,当useQuaternion属性为true,可用.
enumerable: true,
value: quaternion
},
scale: { //Object3D对象scale属性
enumerable: true,
value: scale
},
} );
this.renderDepth = null; //Object3D对象renderDepth属性,初始化为null,如果设置了值将会覆盖渲染深度.
this.rotationAutoUpdate = true; //Object3D对象rotationAutoUpdate属性,初始化为true,表示每帧都会重新计算.
this.matrix = new THREE.Matrix4(); //Object3D对象matrix属性,变换矩阵
this.matrixWorld = new THREE.Matrix4(); //Object3D对象matrixWorld属性,如果当前对象是子对象,matrixWorld属性为上一级对象的变换矩阵,否则是自己的变换矩阵.
this.matrixAutoUpdate = true; //Object3D对象matrixAutoUpdate属性,初始化为true,表示每帧都会重新计算缩放,位置,旋转或四元数矩阵.matrixWorld属性也会重新计算
this.matrixWorldNeedsUpdate = false; //Object3D对象matrixWorldNeedsUpdate属性,初始化为false
this.visible = true; //Object3D对象visible属性,表示当前对象场景中是否可见,初始化为trure
this.castShadow = false; //Object3D对象castShadow属性,初始化为false,表示不产生阴影
this.receiveShadow = false; //Object3D对象receiveShadow属性,初始化为false,表示材质不接受烘焙阴影
this.frustumCulled = true; //Object3D对象frustumCulled属性,初始化为true
this.userData = {}; //Object3D对象userData属性,初始化为{},用户自定义的其它属性,这里的数值不会被clone
};
THREE.Object3D.DefaultUp = new THREE.Vector3( 0, 1, 0 ); //设置Object3D对象的默认上方向.
/****************************************
****下面是Object3D对象提供的功能函数.
****************************************/
THREE.Object3D.prototype = {
constructor: THREE.Object3D, //构造器,返回对创建此对象Object3D函数的引用.
/*
///get eulerOrder 方法用来获得欧拉角的轴顺序
///NOTE: get eulerOrder()的用法是Quaternion.prototype.eulerOrder,这种用法在除ie浏览器以外的浏览器上可以使用.
///NOTE: .eulerOrder方法已经被删除了, 现在使用.rotation.order.这里保留这个方法,为了向下兼容.
*/
///get eulerOrder
///返回欧拉角的轴顺序
get eulerOrder () {
//.eulerOrder方法已经被删除了.这里保留这个方法, 现在使用.rotation.order.为了向下兼容.
console.warn( 'THREE.Object3D: .eulerOrder has been moved to .rotation.order.' );
//返回欧拉角的轴顺序
return this.rotation.order;
},
/*
///set eulerOrder 方法用来设置欧拉角的轴顺序
///NOTE: set eulerOrder()的用法是Quaternion.prototype.eulerOrder,这种用法在除ie浏览器以外的浏览器上可以使用.
///NOTE: .eulerOrder方法已经被删除了, 现在使用.rotation.order.这里保留这个方法,为了向下兼容.
*/
///set eulerOrder
///返回新的欧拉角的轴顺序
set eulerOrder ( value ) {
//.eulerOrder方法已经被删除了.这里保留这个方法, 现在使用.rotation.order.为了向下兼容.
console.warn( 'THREE.Object3D: .eulerOrder has been moved to .rotation.order.' );
//返回新的欧拉角的轴顺序
this.rotation.order = value;
},
/*
///get useQuaternion 方法用来获得useQuaternion属性是否被设置为true
///NOTE: get useQuaternion()的用法是Quaternion.prototype.eulerOrder,这种用法在除ie浏览器以外的浏览器上可以使用.
///NOTE: .useQuaternion方法已经被删除了, 现在默认使用quaternions.
*/
///get useQuaternion
///返回useQuaternion属性是否被设置为true
get useQuaternion () {
///提示用户.useQuaternion方法已经被删除了, 现在默认使用quaternions.
console.warn( 'THREE.Object3D: .useQuaternion has been removed. The library now uses quaternions by default.' );
},
/*
///set useQuaternion 方法用来获得useQuaternion属性是否被设置为true
///NOTE: set useQuaternion()的用法是Quaternion.prototype.eulerOrder,这种用法在除ie浏览器以外的浏览器上可以使用.
///NOTE: .useQuaternion方法已经被删除了, 现在默认使用quaternions.
*/
///set useQuaternion
set useQuaternion ( value ) {
///提示用户.useQuaternion方法已经被删除了, 现在默认使用quaternions.
console.warn( 'THREE.Object3D: .useQuaternion has been removed. The library now uses quaternions by default.' );
},
/*
///applyMatrix方法对对象的matrix属性应用矩阵变换.达到旋转,缩放,移动的目的.
*/
///applyMatrix
///仿射矩阵
///返回新的Object3D对象
applyMatrix: function ( matrix ) {
//multiply方法用来将矩阵a,b相乘,并返回新的Matrix4(4x4矩阵).
this.matrix.multiplyMatrices( matrix, this.matrix );
//decompose方法和compose()方法对应.将转换矩阵的平移、旋转和缩放设置作为由三个 Vector3 对象组成的矢量返回。第一个 Vector3 对象容纳平移元素。第二个 Vector3 对象容纳旋转元素。第三个 Vector3 对象容纳缩放元素。
this.matrix.decompose( this.position, this.quaternion, this.scale );
},
/*
///setRotationFromAxisAngle方法通过四元数的方式旋转任意坐标轴(参数axis)旋转角度(参数angle),最后将结果返回到this.quternion属性中.
/// NOTE:参数axis必须是单位向量,通过调用.normalize()得到单位向量.
*/
///setRotationFromAxisAngle
///三维向量
///角度
///返回新的Object3D对象
setRotationFromAxisAngle: function ( axis, angle ) {
// assumes axis is normalized
// 确保坐标轴是单位向量
this.quaternion.setFromAxisAngle( axis, angle ); //调用quaternion.setFromAxisAngle方法,绕任意轴设定旋转四元数
},
/*
///setRotationFromEuler方法通过一次欧拉旋转(参数euler)设置四元数旋转,最后将结果返回到this.quternion属性中.
*/
///setRotationFromEuler
///THREE.Euler对象,欧拉对象
///true 或者 false,如果不等于false,Quaternion对象调用onChangeCallback函数
///返回新的Object3D对象
setRotationFromEuler: function ( euler ) {
this.quaternion.setFromEuler( euler, true ); //调用quaternion.setFromEuler方法,applyEuler方法通过一次欧拉旋转(参数euler)设置四元数旋转
},
/*
///setRotationFromMatrix方法利用一个参数m(旋转矩阵),达到旋转变换的目的吧,最后将结果返回到this.quternion属性中.
/// NOTE:m是一个旋转矩阵,更多公式:http://en.wikipedia.org/wiki/Transformation_matrix
///
/// 样例:
这个样例是z轴旋转30度.
/----------------------------------------------------\
|cos(heading) = 0.866 | sin(heading) = 0.5 | 0 |
|-----------------------|----------------------------|
matrix = |-sin(heading) = -0.5 |cos(heading) = 0.866 | 0 |
|-----------------------|----------------------|-----|
| 0 | 0 | 1 |
\----------------------------------------------------/
angle = acos ( ( m00 + m11 + m22 - 1)/2)
angle = acos ( ( 0.866 + 0.866 + 1 - 1)/2)
angle = acos ( 0.866 )
angle = 30 degrees
x = (m21 - m12) = 0 - 0 =0
y = (m02 - m20) = 0 - 0 =0
z = (m10 - m01) = -0.5 - 0.5 = -1
*/
///setRotationFromMatrix
///3x3矩阵(旋转矩阵)
///order(旋转顺序) 默认顺序是'XYZ' 取值范围是['XYZ', 'YZX', 'ZXY', 'XZY', 'YXZ', 'ZYX' ]
///返回新的Object3D对象
setRotationFromMatrix: function ( m ) {
// assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)
// 确保参数m是一个3x3的旋转矩阵.
this.quaternion.setFromRotationMatrix( m ); //调用quaternion.setFromRotationMatrix方法,setFromRotationMatrix方法通过参数m(旋转矩阵)设置旋转四元数
},
/*
///setRotationFromQuaternion方法通过规范化的旋转四元数直接应用旋转
*/
///setRotationFromQuaternion
///四元数
///返回新的Object3D对象
setRotationFromQuaternion: function ( q ) {
// assumes q is normalized
// 确保参数q是规范化的
this.quaternion.copy( q ); //调用quaternion.copy方法,copy方法通过直接将规范化的旋转四元数设置给this.quternion属性
},
/*
///rotateOnAxis方法绕任意坐标轴(参数axis)旋转角度(参数angle)
*/
///rotateOnAxis
///三维向量
///角度
///返回新的Object3D对象
rotateOnAxis: function () {
// rotate object on axis in object space
// 在指定的坐标轴上旋转对象.
// axis is assumed to be normalized
// 保证参数axis是规范化的
var q1 = new THREE.Quaternion();
return function ( axis, angle ) {
q1.setFromAxisAngle( axis, angle ); //调用setFromAxisAngle()方法,绕坐标轴旋转指定角度.
this.quaternion.multiply( q1 );
return this; //返回新的Object3D对象
}
}(),
/*
///rotateX方法旋转绕x轴旋转角度(参数angle)
*/
///rotateX
///角度
///返回新的Object3D对象
rotateX: function () {
var v1 = new THREE.Vector3( 1, 0, 0 );
return function ( angle ) {
return this.rotateOnAxis( v1, angle ); //调用rotateOnAxis()方法,绕x轴旋转指定角度.
};
}(),
/*
///rotateY方法旋转绕x轴旋转角度(参数angle)
*/
///rotateY
///角度
///返回新的Object3D对象
rotateY: function () {
var v1 = new THREE.Vector3( 0, 1, 0 );
return function ( angle ) {
return this.rotateOnAxis( v1, angle ); //调用rotateOnAxis()方法,绕Y轴旋转指定角度.
};
}(),
/*
///rotateZ方法旋转绕x轴旋转角度(参数angle)
*/
///rotateZ
///角度
///返回新的Object3D对象
rotateZ: function () {
var v1 = new THREE.Vector3( 0, 0, 1 );
return function ( angle ) {
return this.rotateOnAxis( v1, angle ); //调用rotateOnAxis()方法,绕Z轴旋转指定角度.
};
}(),
/*
///translateOnAxis方法沿任意坐标轴(参数axis)移动指定距离(参数distance)
*/
///translateOnAxis
///三维向量
///距离
///返回新的Object3D对象
translateOnAxis: function () {
// translate object by distance along axis in object space
// 在指定轴上移动对象
// axis is assumed to be normalized
// 参数axis必须是规范化的.
var v1 = new THREE.Vector3();
return function ( axis, distance ) {
v1.copy( axis ).applyQuaternion( this.quaternion ); //调用applyQuaternion()方法,沿任意坐标轴(参数axis)移动指定距离(参数distance)
this.position.add( v1.multiplyScalar( distance ) );
return this; //返回新的Object3D对象
}
}(),
/*
///translate方法沿任意坐标轴(参数axis)移动指定距离(参数distance)
/// NOTE:translate方法已经被删除,被translateOnAxis替代.这里保留,为了向下兼容
*/
///translate
///距离
///三维向量
///返回新的Object3D对象
translate: function ( distance, axis ) {
//提示用户translate方法已经被删除,被translateOnAxis替代.
console.warn( 'THREE.Object3D: .translate() has been removed. Use .translateOnAxis( axis, distance ) instead.' );
return this.translateOnAxis( axis, distance ); //调用translateOnAxis()方法,移动对象,返回新的Object3D对象
},
/*
///translateX方法沿任意x轴移动指定距离(参数distance)
*/
///translateX
///距离
///返回新的Object3D对象
translateX: function () {
var v1 = new THREE.Vector3( 1, 0, 0 );
return function ( distance ) {
return this.translateOnAxis( v1, distance ); //调用translateOnAxis()方法,绕X轴旋转指定角度.
};
}(),
/*
///translateY方法沿任意Y轴移动指定距离(参数distance)
*/
///translateY
///距离
///返回新的Object3D对象
translateY: function () {
var v1 = new THREE.Vector3( 0, 1, 0 );
return function ( distance ) {
return this.translateOnAxis( v1, distance ); //调用translateOnAxis()方法,绕Y轴旋转指定角度.
};
}(),
/*
///translateZ方法沿任意Z轴移动指定距离(参数distance)
*/
///translateZ
///距离
///返回新的Object3D对象
translateZ: function () {
var v1 = new THREE.Vector3( 0, 0, 1 );
return function ( distance ) {
return this.translateOnAxis( v1, distance ); //调用translateOnAxis()方法,绕Z轴旋转指定角度.
};
}(),
/*
///localToWorld方法与worldToLocal方法相对应,将参数vector,从对象坐标空间变换成世界坐标空间
*/
///localToWorld
///Vector3对象
///返回世界坐标空间的Vector3对象.
localToWorld: function ( vector ) {
return vector.applyMatrix4( this.matrixWorld ); //返回世界坐标空间的Vector3对象.
},
/*
///worldToLocal方法与localToWorld方法相对应,将参数vector,从世界坐标空间变换成对象坐标空间
*/
///worldToLocal
///Vector3对象
///返回对象坐标空间的Vector3对象.
worldToLocal: function () {
var m1 = new THREE.Matrix4();
return function ( vector ) {
return vector.applyMatrix4( m1.getInverse( this.matrixWorld ) ); //返回对象坐标空间的Vector3对象.
};
}(),
/*
///lookAt方法用来旋转对象,并将对象面对空间中的点(参数vector)
*/
///lookAt
///Vector3对象
///返回新的Object3D对象
lookAt: function () {
// This routine does not support objects with rotated and/or translated parent(s)
// lookat不支持嵌套对象的旋转,变换
var m1 = new THREE.Matrix4();
return function ( vector ) {
m1.lookAt( vector, this.position, this.up ); //调用THREE.Matrix4.lookAt()方法.
this.quaternion.setFromRotationMatrix( m1 ); //返回新的Object3D对象
};
}(),
/*
///add方法用来将对象(参数object),设置为当前对象的子对象
/// NOTE:参数是多个Object3D对象.
*/
///add
///Object3D对象
///返回包含Object3D对象的Object3D对象.
add: function ( object ) {
if ( arguments.length > 1 ) {
for ( var i = 0; i < arguments.length; i++ ) {
this.add( arguments[ i ] );
}
return this; //返回包含Object3D对象的Object3D对象.
};
if ( object === this ) {
//提示用户,自己不能添加自己.
console.error( "THREE.Object3D.add:", object, "can't be added as a child of itself." );
return this;
}
if ( object instanceof THREE.Object3D ) {
if ( object.parent !== undefined ) {
object.parent.remove( object );
}
object.parent = this;
object.dispatchEvent( { type: 'added' } );
this.children.push( object );
// add to scene
// 添加到当前场景中.
var scene = this;
while ( scene.parent !== undefined ) {
scene = scene.parent;
}
if ( scene !== undefined && scene instanceof THREE.Scene ) {
scene.__addObject( object );
}
} else {
console.error( "THREE.Object3D.add:", object, "is not an instance of THREE.Object3D." );
}
return this; //返回包含Object3D对象的Object3D对象.
},
/*
///remove方法用来将当前对象的子对象(参数object)删除
/// NOTE:参数是多个Object3D对象.
*/
///remove
///当前对象的子对象,Object3D对象
///返回新的Object3D对象
remove: function ( object ) {
if ( arguments.length > 1 ) {
for ( var i = 0; i < arguments.length; i++ ) {
this.remove( arguments[ i ] );
}
};
var index = this.children.indexOf( object );
if ( index !== - 1 ) {
object.parent = undefined;
object.dispatchEvent( { type: 'removed' } );
this.children.splice( index, 1 );
// remove from scene
// 从场景中删除对象.
var scene = this;
while ( scene.parent !== undefined ) {
scene = scene.parent;
}
if ( scene !== undefined && scene instanceof THREE.Scene ) {
scene.__removeObject( object );
}
}
},
raycast: function () {}, //光线跟踪
/*
///traverse方法遍历当前对象以及子对象并且应用callback方法.
*/
///traverse
///要应用的方法
///返回新的Object3D对象
traverse: function ( callback ) {
callback( this ); //应用callback方法.
for ( var i = 0, l = this.children.length; i < l; i ++ ) { //遍历所有子对象,递归调用traverse方法,应用callback方法.
this.children[ i ].traverse( callback );
}
},
/*
///traverse方法遍历当前对象以及子对象并且当对象的Visible属性为true,应用callback方法.
*/
///traverse
///要应用的方法
///返回新的Object3D对象
traverseVisible: function ( callback ) {
if ( this.visible === false ) return;
callback( this );
for ( var i = 0, l = this.children.length; i < l; i ++ ) { //遍历所有子对象,递归调用traverseVisible方法,应用callback方法.
this.children[ i ].traverseVisible( callback );
}
},
/*
///getObjectById方法通过id获得子对象.recursive默认为false,表示不才查找子对象的子对象.
*/
///getObjectById
///要应用的方法
///可选参数,true或者false
///返回id等于id的Object3D对象,没找到返回undefined
getObjectById: function ( id, recursive ) {
for ( var i = 0, l = this.children.length; i < l; i ++ ) {
var child = this.children[ i ];
if ( child.id === id ) {
return child; //返回id等于id的Object3D对象
}
if ( recursive === true ) {
child = child.getObjectById( id, recursive );
if ( child !== undefined ) {
return child; //返回id等于id的Object3D对象
}
}
}
return undefined; //没找到返回undefined.
},
/*
///getObjectById方法通过name获得子对象.recursive默认为false,表示不才查找子对象的子对象.
*/
///getObjectById
///要应用的方法
///可选参数,true或者false
///返回name等于name的Object3D对象,没找到返回undefined
getObjectByName: function ( name, recursive ) {
for ( var i = 0, l = this.children.length; i < l; i ++ ) {
var child = this.children[ i ];
if ( child.name === name ) {
return child; //返回name等于name的Object3D对象
}
if ( recursive === true ) {
child = child.getObjectByName( name, recursive );
if ( child !== undefined ) {
return child; //返回name等于name的Object3D对象
}
}
}
return undefined; ///没找到返回undefined
},
/*
///getChildByName方法通过name获得子对象.recursive默认为false,表示不才查找子对象的子对象.
///NOTE:getChildByName方法已经被getObjectByName方法替换,这里保留为了向后兼容.
*/
///getChildByName
///要应用的方法
///可选参数,true或者false
///返回name等于name的Object3D对象,没找到返回undefined
getChildByName: function ( name, recursive ) {
//提示用户getChildByName方法已经被getObjectByName方法替换,这里保留为了向后兼容.
console.warn( 'THREE.Object3D: .getChildByName() has been renamed to .getObjectByName().' );
return this.getObjectByName( name, recursive ); //调用getObjectByName()方法.
},
/*
///updateMatrix方法对当前对象的matrix属性应用位移,旋转,缩放变换.
*/
///updateMatrix
///返回新的Object3D对象
updateMatrix: function () {
this.matrix.compose( this.position, this.quaternion, this.scale ); //对当前对象的matrix属性应用位移,旋转,缩放变换.
this.matrixWorldNeedsUpdate = true; //设置matrixWorldNeedsUpdate为true
},
/*
///updateMatrixWorld方法对当前对象及其子对象的matrix属性应用全局位移,旋转,缩放变换.
///NOTE: 在updateMatrixWorld方法中如果参数force为true,将对其子对象应用同样的全局变换.
*/
///updateMatrixWorld
///true或者false
///返回新的Object3D对象
updateMatrixWorld: function ( force ) {
if ( this.matrixAutoUpdate === true ) this.updateMatrix();
if ( this.matrixWorldNeedsUpdate === true || force === true ) {
if ( this.parent === undefined ) {
this.matrixWorld.copy( this.matrix );
} else {
this.matrixWorld.multiplyMatrices( this.parent.matrixWorld, this.matrix );
}
this.matrixWorldNeedsUpdate = false;
force = true;
}
// update children
// 更新子对象.
for ( var i = 0, l = this.children.length; i < l; i ++ ) {
this.children[ i ].updateMatrixWorld( force ); //调用updateMatrixWorld方法,对子对象应用变换
}
},
/*clone方法
///clone方法克隆Object3D对象,如果参数force为true,克隆其子对象,否则只克隆当前对象,默认为true.
///NOTE: 在clone方法中如果参数force为true,将对其子对象应用同样的全局变换,默认为true.
*/
///clone
///返回克隆的Object3D对象
clone: function ( object, recursive ) {
if ( object === undefined ) object = new THREE.Object3D();
if ( recursive === undefined ) recursive = true;
object.name = this.name;
object.up.copy( this.up );
object.position.copy( this.position );
object.quaternion.copy( this.quaternion );
object.scale.copy( this.scale );
object.renderDepth = this.renderDepth;
object.rotationAutoUpdate = this.rotationAutoUpdate;
object.matrix.copy( this.matrix );
object.matrixWorld.copy( this.matrixWorld );
object.matrixAutoUpdate = this.matrixAutoUpdate;
object.matrixWorldNeedsUpdate = this.matrixWorldNeedsUpdate;
object.visible = this.visible;
object.castShadow = this.castShadow;
object.receiveShadow = this.receiveShadow;
object.frustumCulled = this.frustumCulled;
object.userData = JSON.parse( JSON.stringify( this.userData ) );
if ( recursive === true ) { //对子对象一一进行克隆.
for ( var i = 0; i < this.children.length; i ++ ) {
var child = this.children[ i ];
object.add( child.clone() );
}
}
return object; //返回克隆的Object3D对象
}
};
///EventDispatcher方法应用到当前Object3D对象.
THREE.EventDispatcher.prototype.apply( THREE.Object3D.prototype );
///设置全局的Object3D对象计数器.
THREE.Object3DIdCount = 0;
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，谢谢合作。
以下代码是THREE.JS 源码文件中Core/Object3D.js文件的注释.
更多更新在 : https://github.com/omni360/three.js.sourcecode