VB：顶点缓冲
IB: 顶点索引缓冲
三角形的顶点顺序决定了三角形是顺时针还是逆时针，从而决定了三角形在背面剔除的过程中是否会被剔除掉。
相关理论知识可以在前面的文章中找到更多的说明。
实现效果
主要代码
1 package 2 { 3 import com.adobe.utils.AGALMiniAssembler; 4 import com.adobe.utils.PerspectiveMatrix3D; 5 6 import flash.display.Sprite; 7 import flash.display.Stage3D; 8 import flash.display3D.Context3D; 9 import flash.display3D.Context3DProgramType; 10 import flash.display3D.Context3DVertexBufferFormat; 11 import flash.display3D.IndexBuffer3D; 12 import flash.display3D.Program3D; 13 import flash.display3D.VertexBuffer3D; 14 import flash.events.Event; 15 import flash.geom.Matrix3D; 16 import flash.geom.Vector3D; 17 18 /** 19 * @author smartqi 20 * @E-mail: 21 * 创建时间：2013-6-29 上午9:36:36 22 * 23 */ 24 public class RectangleTest extends Sprite 25 { 26 27 private var context:Context3D; 28 private var vertexBuff:VertexBuffer3D; 29 private var indexBuff:IndexBuffer3D; 30 private var vertexData:Vector.<Number>; 31 private var indexData:Vector.<uint>; 32 private var shaderProgram:Program3D; 33 private var perspectiveMatrix:PerspectiveMatrix3D; 34 private var i:int; 35 private var sign:int = 1; 36 private const angleGap:Number = 20; 37 private var angle:Number = 0; 38 private var modelMatrix:Matrix3D; 39 private var viewMatrix:Matrix3D; 40 private var finalMatrix:Matrix3D; 41 42 43 public function RectangleTest() 44 { 45 var stage3d:Stage3D = stage.stage3Ds[0]; 46 stage3d.addEventListener(Event.CONTEXT3D_CREATE,onContextCreate); 47 stage3d.requestContext3D(); 48 } 49 50 private function onContextCreate(e:Event):void{ 51 context = (e.target as Stage3D).context3D; 52 if(context == null) return; 53 context.enableErrorChecking = true; //允许进行错误检测，release版本应设置 54 context.configureBackBuffer(500,500,0); //设置显示区域的大小 55 setupVertexBuff(); //设置顶点缓冲 56 setupShaderProgram(); //设置shander 57 setupPerspectiveMatrix(); //设置投影矩阵 58 initMatrix(); 59 addEventListener(Event.ENTER_FRAME,onEnterFrame); 60 } 61 62 private function setupVertexBuff():void{ 63 vertexData = Vector.<Number>([ 64 // x y z r g b 65 40, 40, -40, 1, 0, 0, 66 40, -40, -40, 0, 1, 0, 67 -40, -40, -40, 0, 0, 1, 68 -40, 40, -40, 1, 1, 1, 69 ]); 70 71 indexData = Vector.<uint>([0,1,2,0,2,3]); 72 vertexBuff = context.createVertexBuffer(4,vertexData.length/4); 73 vertexBuff.uploadFromVector(vertexData,0,4); 74 indexBuff = context.createIndexBuffer(6); 75 indexBuff.uploadFromVector(indexData,0,6); 76 context.setVertexBufferAt(0,vertexBuff,0,Context3DVertexBufferFormat.FLOAT_3); 77 context.setVertexBufferAt(1,vertexBuff,3,Context3DVertexBufferFormat.FLOAT_3); 78 } 79 80 private function setupShaderProgram():void{ 81 var vertexProgram:AGALMiniAssembler = new AGALMiniAssembler(); 82 vertexProgram.assemble(Context3DProgramType.VERTEX, 83 "m44 op,va0,vc0 " + 84 "mov v1,va1 "); 85 var fragmentProgram:AGALMiniAssembler = new AGALMiniAssembler(); 86 fragmentProgram.assemble(Context3DProgramType.FRAGMENT, 87 "mov oc,v1"); 88 shaderProgram = context.createProgram(); 89 shaderProgram.upload(vertexProgram.agalcode,fragmentProgram.agalcode); 90 context.setProgram(shaderProgram); 91 } 92 93 private function setupPerspectiveMatrix():void{ 94 perspectiveMatrix = new PerspectiveMatrix3D(); 95 perspectiveMatrix.perspectiveFieldOfViewRH(Math.PI*90/180,1,1,1000); //注意这里的角度使用的是弧度 96 } 97 98 private function initMatrix():void{ 99 modelMatrix = new Matrix3D(); 100 viewMatrix = new Matrix3D(); 101 finalMatrix = new Matrix3D(); 102 } 103 104 private function onEnterFrame(e:Event):void{ 105 context.clear(0,0,0); 106 angle += angleGap; 107 modelMatrix.identity(); 108 modelMatrix.prependRotation(angle,Vector3D.Z_AXIS); //绕着Z轴旋转物体，注意这里的角度使用的是角度 109 if(i>30){ 110 sign = -1; 111 } 112 if(i<0){ 113 sign = 1; 114 } 115 i += sign; 116 viewMatrix.identity(); 117 viewMatrix.prependTranslation(0,0,-30 + i); //将相机向后移，使物体看起来变小了,将相机向前移，使物体看起来变大 118 finalMatrix.identity(); 119 finalMatrix.append(modelMatrix); 120 finalMatrix.append(viewMatrix); 121 finalMatrix.append(perspectiveMatrix); 122 context.setProgramConstantsFromMatrix(Context3DProgramType.VERTEX,0,finalMatrix,true); //上传最终的顶点转换矩阵，注意这里最后一个参数为true 123 context.drawTriangles(indexBuff,0,2); 124 context.present(); 125 } 126 } 127 }