| 资讯类型: 翻译 来源页面: http://jasonbejot.com/?p=295 资讯原标题: Create a Skybox in Away3D 资讯原作者: jasonbejot 使用Away3D创建天空盒（Skybox） jasonbejot, 2009年8月24日 背景 最近我一直在寻找Papervision 3D的替代品，我决定寻找所有Away3D令人兴奋的特性所在。在我花了大量的时间阅读所有API文档后，Skybox和Skybox6这两个类让我非常欣喜。尽管在我的黄金年龄时期，CS（译者：没错，就是反恐！）让我非常沉迷，如今这两个类再次让我沉醉其中。 Away3D的Skybox例子并没有很好的解释如何使用它们，再次我将作更加详细的解释。 描述 如果你玩3D射击游戏，天空盒常常用于天空的绘制，表达远距离的场景和环境。理论上说，就一个内侧面贴了无缝贴图的矩形盒子。这个盒子随着摄像机一起运动，永远位于远端。 类描述 Away3D使用两个类非常简单的实现这个效果：Skybox和Skybox6。二者的区别是：Skybox使用6张独立的图片（每个内侧面一张）而Skybox6使用一张由6个面图像构成的图（译者：就是一张大图）。 Skybox类非常直接，就是输入6张图像并在每一个面上贴一个，接下来，我将详细描述Skybox6这个类。 建立图像 Skybox6使用一张图像贴图，该图像可以理解为一张3x2的贴图（3个面宽，2个面高）。Away3D并没有解释如何建立这样的贴图。实际映射如下：  -左上：前面 -中上：右面 -右上：后面 -左下：左面 -中下：上面 -右下：下面 由于Skybox是立方体，所以每一面的图像都应该是正方形。在我的例子中，每一面的图像都是512x512的，3x2的贴图就是1536x1024的。有点大，但是工作得很好。 使用方法 代码：
例子 下面是我使用上面代码所做的例子，使用了一个网格来表示其位置关系。 代码下载 这里。注意该工程默认设置的是Flash 10版本的player，可以根据需要做调整。 |
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原文地址：
http://www.jasonsturges.com/2012/07/skybox-in-away3d/
范例目的：
1 如何使用一个 CubeTexture 创建一个 SkyBox 对象
2 如何给材料应用 CubeTexture 以用作环境映射
1 /* 2 3 SkyBox example in Away3d 4 5 Demonstrates: 6 7 How to use a CubeTexture to create a SkyBox object. 8 How to apply a CubeTexture to a material as an environment map. 9 10 Code by Rob Bateman 11 rob@infiniteturtles.co.uk 12 http://www.infiniteturtles.co.uk 13 14 This code is distributed under the MIT License 15 16 Copyright (c) 17 18 Permission is hereby granted, free of charge, to any person obtaining a copy 19 of this software and associated documentation files (the “Software”), to deal 20 in the Software without restriction, including without limitation the rights 21 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 22 copies of the Software, and to permit persons to whom the Software is 23 furnished to do so, subject to the following conditions: 24 25 The above copyright notice and this permission notice shall be included in 26 all copies or substantial portions of the Software. 27 28 THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 29 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 30 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 31 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 32 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 33 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 34 THE SOFTWARE. 35 36 */ 37 38 package 39 { 40 import away3d.cameras.lenses.*; 41 import away3d.containers.*; 42 import away3d.entities.*; 43 import away3d.materials.*; 44 import away3d.materials.methods.*; 45 import away3d.primitives.*; 46 import away3d.textures.*; 47 import away3d.utils.*; 48 49 import flash.display.*; 50 import flash.events.*; 51 import flash.geom.Vector3D; 52 53 [SWF(backgroundColor="#000000", frameRate="60", quality="LOW")] 54 55 public class Basic_SkyBox extends Sprite 56 { 57 // Environment map. 58 [Embed(source="../embeds/skybox/snow_positive_x.jpg")] 59 private var EnvPosX:Class; 60 [Embed(source="../embeds/skybox/snow_positive_y.jpg")] 61 private var EnvPosY:Class; 62 [Embed(source="../embeds/skybox/snow_positive_z.jpg")] 63 private var EnvPosZ:Class; 64 [Embed(source="../embeds/skybox/snow_negative_x.jpg")] 65 private var EnvNegX:Class; 66 [Embed(source="../embeds/skybox/snow_negative_y.jpg")] 67 private var EnvNegY:Class; 68 [Embed(source="../embeds/skybox/snow_negative_z.jpg")] 69 private var EnvNegZ:Class; 70 71 //engine variables 72 private var _view:View3D; 73 74 //scene objects 75 private var _skyBox:SkyBox; 76 private var _torus:Mesh; 77 78 /** 79 * Constructor 80 */ 81 public function Basic_SkyBox() 82 { 83 stage.scaleMode = StageScaleMode.NO_SCALE; 84 stage.align = StageAlign.TOP_LEFT; 85 86 //setup the view 87 _view = new View3D(); 88 addChild(_view); 89 90 //setup the camera 91 _view.camera.z = -600; 92 _view.camera.y = 0; 93 _view.camera.lookAt(new Vector3D()); 94 _view.camera.lens = new PerspectiveLens(90); 95 96 //setup the cube texture 97 var cubeTexture:BitmapCubeTexture = new BitmapCubeTexture(Cast.bitmapData(EnvPosX), Cast.bitmapData(EnvNegX), Cast.bitmapData(EnvPosY), Cast.bitmapData(EnvNegY), Cast.bitmapData(EnvPosZ), Cast.bitmapData(EnvNegZ)); 98 99 //setup the environment map material 100 var material:ColorMaterial = new ColorMaterial(0xFFFFFF, 1); 101 material.specular = 0.5; 102 material.ambient = 0.25; 103 material.ambientColor = 0x111199; 104 material.ambient = 1; 105 material.addMethod(new EnvMapMethod(cubeTexture, 1)); 106 107 //setup the scene 108 _torus = new Mesh(new TorusGeometry(150, 60, 40, 20), material); 109 _view.scene.addChild(_torus); 110 111 _skyBox = new SkyBox(cubeTexture); 112 _view.scene.addChild(_skyBox); 113 114 //setup the render loop 115 addEventListener(Event.ENTER_FRAME, _onEnterFrame); 116 stage.addEventListener(Event.RESIZE, onResize); 117 onResize(); 118 } 119 120 /** 121 * render loop 122 */ 123 private function _onEnterFrame(e:Event):void 124 { 125 _torus.rotationX += 2; 126 _torus.rotationY += 1; 127 128 _view.camera.position = new Vector3D(); 129 _view.camera.rotationY += 0.5*(stage.mouseX-stage.stageWidth/2)/800; 130 _view.camera.moveBackward(600); 131 132 _view.render(); 133 } 134 135 /** 136 * stage listener for resize events 137 */ 138 private function onResize(event:Event = null):void 139 { 140 _view.width = stage.stageWidth; 141 _view.height = stage.stageHeight; 142 } 143 } 144 }