[ActionScript 3.0] Away3D 天空盒（skybox）例子

 /*

 SkyBox example in Away3d

 Demonstrates:

 How to use a CubeTexture to create a SkyBox object.
 How to apply a CubeTexture to a material as an environment map.

 Code by Rob Bateman
 [e-mail]
 http://www.infiniteturtles.co.uk

 This code is distributed under the MIT License

 Copyright (c) The Away Foundation http://www.theawayfoundation.org

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the “Software”), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.

 */

 package
 {
     import away3d.cameras.lenses.*;
     import away3d.containers.*;
     import away3d.entities.*;
     import away3d.materials.*;
     import away3d.materials.methods.*;
     import away3d.primitives.*;
     import away3d.textures.*;
     import away3d.utils.*;

     import flash.display.*;
     import flash.events.*;
     import flash.geom.Vector3D;

     [SWF(backgroundColor="#000000", frameRate="60", quality="LOW")]

     public class Basic_SkyBox extends Sprite
     {
         // Environment map.
         [Embed(source="../embeds/skybox/snow_positive_x.jpg")]
         private var EnvPosX:Class;
         [Embed(source="../embeds/skybox/snow_positive_y.jpg")]
         private var EnvPosY:Class;
         [Embed(source="../embeds/skybox/snow_positive_z.jpg")]
         private var EnvPosZ:Class;
         [Embed(source="../embeds/skybox/snow_negative_x.jpg")]
         private var EnvNegX:Class;
         [Embed(source="../embeds/skybox/snow_negative_y.jpg")]
         private var EnvNegY:Class;
         [Embed(source="../embeds/skybox/snow_negative_z.jpg")]
         private var EnvNegZ:Class;

         //engine variables
         private var _view:View3D;

         //scene objects
         private var _skyBox:SkyBox;
         private var _torus:Mesh;

         /**
          * Constructor
          */
         public function Basic_SkyBox()
         {
             stage.scaleMode = StageScaleMode.NO_SCALE;
             stage.align = StageAlign.TOP_LEFT;

             //setup the view
             _view = new View3D();
             addChild(_view);

             //setup the camera
             _view.camera.z = -600;
             _view.camera.y = 0;
             _view.camera.lookAt(new Vector3D());
             _view.camera.lens = new PerspectiveLens(90);

             //setup the cube texture
             var cubeTexture:BitmapCubeTexture = new BitmapCubeTexture(Cast.bitmapData(EnvPosX), Cast.bitmapData(EnvNegX), Cast.bitmapData(EnvPosY), Cast.bitmapData(EnvNegY), Cast.bitmapData(EnvPosZ), Cast.bitmapData(EnvNegZ));

             //setup the environment map material
             var material:ColorMaterial = new ColorMaterial(0xFFFFFF, 1);
             material.specular = 0.5;
             material.ambient = 0.25;
             material.ambientColor = 0x111199;
             material.ambient = 1;
             material.addMethod(new EnvMapMethod(cubeTexture, 1));

             //setup the scene
             _torus = new Mesh(new TorusGeometry(150, 60, 40, 20), material);
             _view.scene.addChild(_torus);

             _skyBox = new SkyBox(cubeTexture);
             _view.scene.addChild(_skyBox);

             //setup the render loop
             addEventListener(Event.ENTER_FRAME, _onEnterFrame);
             stage.addEventListener(Event.RESIZE, onResize);
             onResize();
         }

         /**
          * render loop
          */
         private function _onEnterFrame(e:Event):void
         {
             _torus.rotationX += 2;
             _torus.rotationY += 1;

             _view.camera.position = new Vector3D();
             _view.camera.rotationY += 0.5*(stage.mouseX-stage.stageWidth/2)/800;
             _view.camera.moveBackward(600);

             _view.render();
         }

         /**
          * stage listener for resize events
          */
         private function onResize(event:Event = null):void
         {
             _view.width = stage.stageWidth;
             _view.height = stage.stageHeight;
         }
     }
 }