154 lines
4.5 KiB
Markdown
154 lines
4.5 KiB
Markdown
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在3D Max中可以通过时间轴制作摄像机动画，你可以通过Egret3D所提供得插件将制作好的摄像机动画导出为`eca`格式文件，并通过在程序中对该文件的解析，生成摄像机动画。
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为了方便查看效果，我们首先在3D MAX中制作一个简单的摄像机动画。3D MAX中，场景如下：
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摄像机运动轨迹如下：
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我们以摄像机视角，查看整个场景运行效果如图：
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通过Egret3D插件导出其动画文件，名称为`Camera001.eca`，由于当前场景中摄像机名称为`Camera001`，所有导出文件保留其元素命名。
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你需要借助`URLLoader`类来加载`Camera001.eca`文件，当文件加载完成后，得到的数据`evt.target.data`其数据类型为`egret3d.CameraAnimationController`。
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在Egret3D中，控制摄像机的动画类由`CameraAnimationController`实现，每一帧中的数据由`CameraAnimationFrame`实现。
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当你的数据加载并解析完成后，你就可以使用这个`CameraAnimationController`。当在使用之前，你需要通过其中的`bindCamera`方法绑定要控制的摄像机。
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具体编码步骤如下：
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1、加载`eca`文件
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```
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var load:egret3d.URLLoader = new egret3d.URLLoader();
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load.addEventListener(egret3d.LoaderEvent3D.LOADER_COMPLETE,this.com,this);
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load.load("resource/Camera001.eca");
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```
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```
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private ani:egret3d.CameraAnimationController;
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private com(evt:egret3d.LoaderEvent3D)
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{
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this.ani = evt.target.data;
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}
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```
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2、绑定摄像机
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```
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this.ani.bindCamera(this._view.camera3D);
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```
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3、注册刷新
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```
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this.canvas.addEventListener(egret3d.Event3D.ENTER_FRAME,this.update,this);
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```
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```
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private update(evt:egret3d.Event3D)
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{
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this.ani.update(10,16);
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}
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```
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每一次调用`CameraAnimationController`的`update`方法，才会更新一次摄像机动画。每一次更新，`update`方法需要两个参数。第一个参数为当前时间，第二个参数为每帧时间间隔。
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4、播放动画
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```
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this.ani.play(true);
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```
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`play`方法中，参数如果为`true`，则摄像机动画循环播放。
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5、暂停动画
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```
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this.ani.stop();
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```
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6、监听动画播放完毕事件
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```
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this.ani.addEventListener(egret3d. CameraAnimationController.EVENT_CAMERA_COMPLETE,this.AniComplete,this);
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```
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摄像机动画的事件直接封装到了`CameraAnimationController`中，并没有单独放置于独立的事件类中。
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上述示例完整代码如下：
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```
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class CameraAni extends LoadingUI
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{
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private _view:egret3d.View3D;
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protected canvas:egret3d.Egret3DCanvas;
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public constructor()
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{
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super();
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this.CloseLoadingView();
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this.canvas = new egret3d.Egret3DCanvas();
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this.canvas.x = 0;
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this.canvas.y = 0;
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this.canvas.width = window.innerWidth;
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this.canvas.height = window.innerHeight;
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this.canvas.start();
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this._view = new egret3d.View3D(0,0,window.innerWidth,window.innerHeight);
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this.canvas.addView3D(this._view);
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this._view.backColor = 0x00ff00;
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this.createCub();
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this._view.camera3D.lookAt(new egret3d.Vector3D(300, 500, -1000), new egret3d.Vector3D(0, 0, 0));
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var load:egret3d.URLLoader = new egret3d.URLLoader();
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load.addEventListener(egret3d.LoaderEvent3D.LOADER_COMPLETE,this.com,this);
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load.load("resource/Camera001.eca");
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}
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private cube:egret3d.Mesh;
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private mat:egret3d.TextureMaterial;
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private createCub()
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{
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var mat:egret3d.TextureMaterial = new egret3d.TextureMaterial();
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var go:egret3d.CubeGeometry = new egret3d.CubeGeometry(10,10,10);
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var cube:egret3d.Mesh = new egret3d.Mesh(go, mat);
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this._view.addChild3D(cube);
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}
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private ani:egret3d.CameraAnimationController;
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private com(evt:egret3d.LoaderEvent3D)
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{
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this.ani = evt.target.data;
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this.ani.bindCamera(this._view.camera3D);
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this.ani.play(true);
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this.canvas.addEventListener(egret3d.Event3D.ENTER_FRAME,this.update,this);
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}
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private update(evt:egret3d.Event3D)
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{
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this.ani.update(10,16);
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}
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}
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```
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编译并运行，效果如图：
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## 摄像机帧数据
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由于摄像机动画相对比较简单，不涉及变形等信息，只包含了时间和摄像机在三维空间中的运动轨迹于姿态。你可以通过`CameraAnimationController`类中的`cameraAnimationFrames`属性获取当前摄像机动画的全部帧数据。每个帧数据的内容可参考`CameraAnimationFrame`类的API内容。
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