Away3D实例教程 - 贴图（EnviroBitmapMaterial）

本篇包含内容：

• 3D基本元素 - 圆环
• 环境位图材质EnviroBitmapMaterial。

转载请注明出处：nooon.cnblogs.com 

本例会用到的图片：

             

先看本例子最终效果：点击观看

从例子里我们看到，圆环反射环境里的金色光泽，但你细心观察可以发现不是真的实时反射。

再看完整代码（Flex）：

package
{
    import away3d.cameras.HoverCamera3D;
    import away3d.containers.ObjectContainer3D;
    import away3d.containers.View3D;
    import away3d.core.math.Number3D;
    import away3d.core.utils.Cast;
    import away3d.materials.BitmapMaterial;
    import away3d.materials.EnviroBitmapMaterial;
    import away3d.primitives.Plane;
    import away3d.primitives.Sphere;
    import away3d.primitives.Torus;

    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;

    [SWF(width="600", height="500", frameRate="60", backgroundColor="#FFFFFF")]
    public class enviroBitmapMaterial extends Sprite
    {
        //定义 变量
        private var view:View3D;
        private var cam:HoverCamera3D;

        private var planeMaterial:BitmapMaterial;
        private var torusMaterial:EnviroBitmapMaterial;
        private var plane:Plane;
        private var group:ObjectContainer3D;
        private var torus:Torus;

        private var mouseDown:Boolean;
        private var lastMouseX:Number;
        private var lastMouseY:Number;
        private var lastPanangle:Number;
        private var lastTiltangle:Number;
        private var cameraSpeed:Number;

        //嵌入图片,goldbackground.jpg用于背景及环境图；adobe_ico.jpg    是圆环的皮肤
        [Embed(source="resources/goldbackground.jpg")] private var goldImage:Class;
        [Embed(source="resources/nooon.jpg")] private var skinImage:Class;

        public function enviroBitmapMaterial()
        {
            //新建各贴图材质，备用。
            createMaterial();
            //inital 3D
            init3D();
            //create 3D Scene
            createScene();
            //addLsitener
            addEventListener(Event.ENTER_FRAME,update);
            stage.addEventListener(MouseEvent.MOUSE_DOWN,m_down_h);
            stage.addEventListener(MouseEvent.MOUSE_UP,m_up_h);

        }
        private function createMaterial():void
        {
            //背景的贴图材质为    BitmapMaterial
            planeMaterial=new BitmapMaterial(Cast.bitmap(new goldImage()),{smooth:true, precision:5});
            //圆环要反射环境，用EnviroBitmapMaterial
            //EnviroBitmapMaterial构造函数EnviroColorMaterial(color:*, enviroMap:BitmapData, init:Object = null)
            //第二个参数必须是BitmapData，用于设置反射环境图，本例与背景平面用同一张图goldBackground
            torusMaterial=new EnviroBitmapMaterial(Cast.bitmap(new skinImage()),Cast.bitmap(new goldImage()));
            //设置EnviroBitmapMaterial的反射系数，数值为0～1,自行设定数值大小看看效果。
            torusMaterial.reflectiveness = 0.4;

            //在这里顺便设置下后面要用到的一个参数cameraSpeed，这个参数影响：拖动鼠标是整个场景旋转速度。
            cameraSpeed=.3;
        };
        private function init3D():void
        {
            cam  = new HoverCamera3D({focus:300});
            cam.lookAt( new Number3D(0, 0, 0) );
            cam.distance=900;
            cam.panangle=cam.targetpanangle=30;
            cam.tiltangle=cam.targettiltangle=15;
            cam.mintiltangle=5;

            view = new View3D({camera:cam,x:300,y:250});
            addChild(view);
        };
        private function createScene():void
        {
            group=new ObjectContainer3D();
            //创建背景平面
            plane=new Plane({material:planeMaterial,width:250,height:250,segmentsW:8,segmentsH:8});
            //创建圆环
            //radius:圆环总半径；tube:环的圆管半径
            //所使用的材质为 torusMaterial，它是EnviroBitmapMaterial
            torus= new Torus({material:torusMaterial,radius:30,tube:20,segmentsR:15,segmentsT:12});
            torus.y=55;

            view.scene.addChild(group);

            group.addChild(plane);
            group.addChild(torus);
        };
        private function update(e:Event):void
        {
            if(mouseDown)
            {
                cam.targetpanangle=cameraSpeed*(stage.mouseX-lastMouseX)+lastPanangle;
                cam.targettiltangle=cameraSpeed*(stage.mouseY-lastMouseY)+lastTiltangle;
            };
            torus.yaw(-1);
            torus.pitch(-1);
            torus.roll(-1);
            cam.hover();
            view.render();

        };
        private function m_down_h(e:MouseEvent):void
        {
          mouseDown=true;
          lastMouseX=stage.mouseX;
          lastMouseY=stage.mouseY;
          lastPanangle=cam.targetpanangle;
          lastTiltangle=cam.targettiltangle;
        };
        private function m_up_h(e:MouseEvent):void
        {
            mouseDown=false;
        };

    }
}