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Object3D是显示对象的一个抽象模型,所有能够参与渲染的元素均继承自该类。我们可以通过一系列的属性与方法设置3D对象的位置,尺寸以及旋转等属性。

Object3D是3D空间中的实体对象。场景图中的Object3D对象是一个树型结构,对象中包含了变换信息.这些变换信息应用于所有的子对象,子对象也有自己的变换信息,最终的变换信息要结合父对象的变换信息每个Object3D对象在生成时会创建一个包围盒。

创建Object3D对象

创建语法如下:

var obj3d:egret3d.Object3D = new egret3d.Object3D();

作为容器,添加子对象

var target:egret3d.Object3D = new egret3d.Object3D();
var container:egret3d.Object3D = new egret3d.Object3D();

container.addChild( target );

添加子对象,并指定下标

var target:egret3d.Object3D = new egret3d.Object3D();
var container:egret3d.Object3D = new egret3d.Object3D();

container.addChildAt( target, 5 );

其中第二个参数是子对象的下标,所有的子对象全部存储在一个数组中,如需要,可通过下面方法获取子对象。

var obj3d:egret3d.Object3D = container.childs[5];

移除子物体

var target:egret3d.Object3D = new egret3d.Object3D();
var container:egret3d.Object3D = new egret3d.Object3D();

container.addChildAt( target, 5 );

container.removeChild( target );

查找子物体

var target:egret3d.Object3D = new egret3d.Object3D();
target.id = 55;
target.name = "myObj";
var container:egret3d.Object3D = new egret3d.Object3D();

container.addChildAt( target, 5 );


//通过id属性查找
var obj:egret3d.Object3D = container.findObject3DToID(55);

//通过name属性查找
var obj2:egret3d.Object3D = container. findObject3D("myObj");

旋转、位移与缩放

var obj3d:egret3d.Object3D = new egret3d.Object3D();

//旋转,方法1
obj3d.rotationX = 50;
obj3d.rotationY = 20;
obj3d.rotationZ = 90;

//旋转,方法2
obj3d.rotation = new egret3d.Vector3D(50,20,90);

//位移,方法1
obj3d.x = 45;
obj3d.y = 22;
obj3d.z = 1024;

//位移,方法2
obj3d.position = new egret3d.Vector3D(45, 22, 1024);

//缩放,方法1
obj3d.scaleX = 2;
obj3d.scaleY = 4;
obj3d.scaleZ = 6;

//缩放,方法2
obj3d.scale = new egret3d.Vector3D(2, 4, 6);