99 lines
2.3 KiB
Markdown
99 lines
2.3 KiB
Markdown
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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。
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`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。
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## 创建`Object3D`对象
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创建语法如下：
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```
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var obj3d:egret3d.Object3D = new egret3d.Object3D();
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```
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## 作为容器，添加子对象
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```
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var target:egret3d.Object3D = new egret3d.Object3D();
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var container:egret3d.Object3D = new egret3d.Object3D();
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container.addChild( target );
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```
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## 添加子对象，并指定下标
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```
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var target:egret3d.Object3D = new egret3d.Object3D();
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var container:egret3d.Object3D = new egret3d.Object3D();
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container.addChildAt( target, 5 );
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```
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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。
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```
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var obj3d:egret3d.Object3D = container.childs[5];
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```
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## 移除子物体
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```
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var target:egret3d.Object3D = new egret3d.Object3D();
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var container:egret3d.Object3D = new egret3d.Object3D();
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container.addChildAt( target, 5 );
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container.removeChild( target );
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```
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## 查找子物体
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```
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var target:egret3d.Object3D = new egret3d.Object3D();
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target.id = 55;
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target.name = "myObj";
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var container:egret3d.Object3D = new egret3d.Object3D();
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container.addChildAt( target, 5 );
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//通过id属性查找
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var obj:egret3d.Object3D = container.findObject3DToID(55);
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//通过name属性查找
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var obj2:egret3d.Object3D = container. findObject3D("myObj");
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```
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## 旋转、位移与缩放
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```
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var obj3d:egret3d.Object3D = new egret3d.Object3D();
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//旋转，方法1
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obj3d.rotationX = 50;
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obj3d.rotationY = 20;
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obj3d.rotationZ = 90;
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//旋转，方法2
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obj3d.rotation = new egret3d.Vector3D(50,20,90);
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//位移，方法1
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obj3d.x = 45;
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obj3d.y = 22;
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obj3d.z = 1024;
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//位移，方法2
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obj3d.position = new egret3d.Vector3D(45, 22, 1024);
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//缩放，方法1
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obj3d.scaleX = 2;
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obj3d.scaleY = 4;
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obj3d.scaleZ = 6;
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//缩放，方法2
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obj3d.scale = new egret3d.Vector3D(2, 4, 6);
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```
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