[ActionScript 3.0] Away3D 灯光的使用

package
{
    import away3d.containers.View3D;
    import away3d.entities.Mesh;
    import away3d.events.MouseEvent3D;
    import away3d.lights.DirectionalLight;
    import away3d.lights.PointLight;
    import away3d.materials.ColorMaterial;
    import away3d.materials.TextureMaterial;
    import away3d.materials.lightpickers.StaticLightPicker;
    import away3d.materials.methods.FilteredShadowMapMethod;
    import away3d.primitives.CubeGeometry;
    import away3d.primitives.PlaneGeometry;
    import away3d.utils.Cast;
    
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.events.Event;
    
    /**
     * @author Frost.Yen
     * @E-mail 871979853@qq.com
     * @create 2015-9-23 下午3:27:28
     *
     */
    [SWF(width='800',height='600',frameRate="60", backgroundColor="0x000000")]
    public class Away3dLight extends Sprite
    {
        
        //floor的贴图图片
        [Embed(source = "assets/1.jpg")]
        private static var FloorMaterial:Class;
        //声明视口
        private var _view:View3D;
        //声明平面几何对象
        private var _planeGeometry:PlaneGeometry;
        //声明平面对象的贴图
        private var _planeMaterial:TextureMaterial;
        //声明平面几何对象的容器
        private var _planeMesh:Mesh;
        //控制旋转方向的变量
        private var _direction:Boolean;
        //声明cube对象
        private var _cubeGeometry:CubeGeometry;
        //声明cube对象容器
        private var _cubeMesh:Mesh;
        
        //灯光
        private var _directionalLight:DirectionalLight;
        private var _pointLight:PointLight;
        //灯光容器
        private var _light:StaticLightPicker;
        

        public function Away3dLight()
        {
            if (stage) {
                init();
            }else {
                this.addEventListener(Event.ADDED_TO_STAGE, init);
            }

        }
        private function init(e:Event=null):void {
            //trace("舞台初始化完成！");
            //设置舞台缩放模式和对齐方式
            stage.scaleMode = StageScaleMode.NO_SCALE;
            stage.align = StageAlign.TOP_LEFT;
            this.removeEventListener(Event.ADDED_TO_STAGE, init);
            
            //实例化视口
            _view = new View3D();
            addChild(_view);
            //设置抗锯齿参数
            _view.antiAlias = 6;
            
            //实例化一个长宽都是300的平面对象
            _planeGeometry = new PlaneGeometry(300, 300);
            //实例化贴图对象
            _planeMaterial = new TextureMaterial(Cast.bitmapTexture(FloorMaterial));
            //实例化平面几何对象的容器，第一个参数是平面几何对象，第二个参数是贴图数据
            _planeMesh = new Mesh(_planeGeometry, _planeMaterial);
            //设置容器可交互
            _planeMesh.mouseEnabled = true;
            //容器侦听鼠标点击事件
            _planeMesh.addEventListener(MouseEvent3D.CLICK, clickHandler);
            
            //将容器添加到视口的场景中
            _view.scene.addChild(_planeMesh);
            
            _cubeGeometry = new CubeGeometry();
            _cubeMesh = new Mesh(_cubeGeometry, new ColorMaterial(0xcccccc));
            _cubeMesh.mouseEnabled = true;
            _cubeMesh.y = 150;
            _cubeMesh.z = -40;
            _view.scene.addChild(_cubeMesh);
            
            //添加平行光源
            _directionalLight = new DirectionalLight();
            _directionalLight.diffuse = .8;
            _directionalLight.ambient = .3;
            _directionalLight.castsShadows = true;
            
            //添加点光源
            _pointLight = new PointLight();
            _pointLight.ambient = 0.4;
            //_pointLight.diffuse = 10;
            
            //实例化灯光容器
            _light = new StaticLightPicker([_directionalLight,_pointLight]);
            
            //给地面添加阴影效果
            _planeMaterial.shadowMethod = new FilteredShadowMapMethod(_directionalLight);
            
            //给两个模型的材质添加灯光
            _planeMesh.material.lightPicker = _light;
            _cubeMesh.material.lightPicker = _light;
            
            //将灯光添加到场景
            _view.scene.addChild(_directionalLight);
            
            //设置摄像机的位置
            _view.camera.z = -400;
            _view.camera.y = 200;    //可以把这个值改成1试试看，这样可以有更加直观的感受
            //_view.camera.x = 90;
            //设置摄像机始终指向平面
            _view.camera.lookAt(_planeMesh.position);
            //_view.camera.lookAt(new Vector3D());
            
            this.addEventListener(Event.ENTER_FRAME, onEnterFrame);
            stage.addEventListener(Event.RESIZE, onResize);
            onResize();
        }
        
        private function clickHandler(e:MouseEvent3D):void {
            //鼠标点击变换运动方向
            _direction = !_direction;
        }
        
        private function onResize(e:Event = null):void {
            //调整视口尺寸以适应新的窗口大小
            _view.width = stage.stageWidth;
            _view.height = stage.stageHeight;
        }
        
        private function onEnterFrame(e:Event):void {
            //判断方向旋转
            _cubeMesh.rotationX += 1;
            _cubeMesh.rotationY += 1;
            if (!_direction) {
                _planeMesh.rotationY += 1;
            }else {
                _planeMesh.rotationY -= 1;
            }
            //渲染3D世界
            _view.render();
        }

    }
}