pv教学

Papervision3D 教學 part 3.2 -- 子母視窗

想嚐試製作子母視窗的感覺，建立了兩個 Camera3D，但是並無法透過 camera2 看到 scene，然後輸出在另外一個 MC 上，或許有方法可以做到，我還需要找找看。而以下我的作法是，用 camera2 先將 scene 輸出一次，並且立即讀取其 BiemapData 將之繪製到另外一個 MC 子視窗中，然後立刻改以 camera 將 scene 重新輸出一次。程式碼如下：



package {import flash.display.*;import flash.events.*;import flash.utils.*;import org.papervision3d.cameras.Camera3D;import org.papervision3d.scenes.Scene3D;import org.papervision3d.objects.*;import org.papervision3d.materials.*;import flash.geom.Rectangle;import flash.geom.Matrix;[SWF(backgroundColor="#000000", frameRate="60", width="400", height="400")]public class T3step2 extends Sprite{private static var PI:Number = Math.PI;private static var TH:Number = PI / 180;private var container:Sprite;private var scene:Scene3D;private var camera:Camera3D;private var camera2:Camera3D;private var rootNode:DisplayObject3D;private var du:Number = 0;private var photoCount:int = 9;private var movingRadius:int = 1000;private var movingHeight:int = 500;private var timer:Timer;private var childWindowScreen:Sprite;private var bd:BitmapData;private var matrix:Matrix;private var bmp:Bitmap;public function T3step2(){ // initialize the objects init3D(); // add a listener for the 3D loop addEventListener(Event.ENTER_FRAME, loop3D);}private function init3D():void{ container = new Sprite(); addChild(container); container.x = 200; container.y = 200; scene = new Scene3D(container); camera = new Camera3D(); camera.y = movingHeight; camera.z = -movingRadius; camera.zoom = 10; camera.focus = 100; camera2 = new Camera3D(); camera2.y = movingHeight; camera2.z = -movingRadius; camera2.zoom = 10; camera2.focus = 100; rootNode = scene.addChild(new DisplayObject3D("rootNode")); var ground:DisplayObject3D = rootNode.addChild(new Plane(new ColorMaterial(0xffcc00), 500, 500, 3, 3), "ground"); ground.rotationX = -90; var item:DisplayObject3D = new DisplayObject3D(); item.addChild(new Plane(new BitmapFileMaterial(getFileName()), 100, 100, 1, 1, {rotationY:0, z:-50}), "p1"); item.addChild(new Plane(new BitmapFileMaterial(getFileName()), 100, 100, 1, 1, {rotationY:90, x:-50}), "p2"); item.addChild(new Plane(new BitmapFileMaterial(getFileName()), 100, 100, 1, 1, {rotationY:-90, x:50}), "p3"); item.addChild(new Plane(new BitmapFileMaterial(getFileName()), 100, 100, 1, 1, {rotationY:180, z:50}), "p4"); item.addChild(new Plane(new BitmapFileMaterial(getFileName()), 100, 100, 1, 1, {rotationX:90, y:-50}), "p5"); item.addChild(new Plane(new BitmapFileMaterial(getFileName()), 100, 100, 1, 1, {rotationX:-90, y:50}), "p6"); item.y = 150; rootNode.addChild(item, "item"); /* timer = new Timer(1000, 0); timer.addEventListener(TimerEvent.TIMER, onTimer); timer.start(); */ //子母視窗 var childWindow:Sprite = new Sprite(); addChild(childWindow); var childWindowBorder:Sprite = new Sprite(); childWindow.addChild(childWindowBorder); childWindowBorder.graphics.lineStyle(2, 0xffffff); childWindowBorder.graphics.drawRect(0, 0, 100, 100); childWindowScreen = new Sprite(); childWindow.addChild(childWindowScreen); childWindow.x = 300; childWindow.y = 300;}private function loop3D(event:Event):void{ //物體本身旋轉 var item:DisplayObject3D = rootNode.getChildByName("item"); if(item!=null){  item.rotationX++;  item.rotationY++;  item.rotationZ++; } //carema2先將畫面記錄下來 scene.renderCamera(camera2); bd = new BitmapData(400, 400, false, 0x0000ff); matrix = new Matrix(); matrix.translate(200, 200); matrix.scale(0.25, 0.25); bd.draw(scene.container, matrix); if(bmp!=null){  childWindowScreen.removeChild(bmp); } bmp = new Bitmap(bd); childWindowScreen.addChild(bmp); bd = null; //改用carema旋轉輸出 du++; if(du==360)du=0; var newX:Number = movingRadius * formatNum(Math.cos(du*TH), 3); var newZ:Number = movingRadius * formatNum(Math.sin(du*TH), 3); camera.x = newX; camera.z = newZ; scene.renderCamera(camera);}private function formatNum(num:Number, cnt:Number):Number{ return Math.round(num * Math.pow(10, cnt)) / Math.pow(10, cnt);}private function onTimer(event:TimerEvent):void{ var item:DisplayObject3D = rootNode.getChildByName("item"); if(item!=null){  var pName:String = "p" + (Math.floor(Math.random()*6)+1);  var p:DisplayObject3D = item.getChildByName(pName);  if(p!=null){   p.material = new BitmapFileMaterial(getFileName());  } }}private function getFileName():String{ return "http://ben.rb.chang.googlepages.com/photos"+(Math.floor(Math.random()*photoCount)+1)+".JPG";}}}


測試時，不斷搞到瀏覽器當掉，後來我將 onTimer() 時的切換各面向的貼圖部分拿掉，改善了一點點！此外，若是觀察記憶體消耗的話，會發現他很快就衝到頂點，然後只好等 Gabarge Collection(GC) 自己找時間釋放掉，才會稍微順暢幾秒鐘......$%&@#



等到整個瀏覽器關閉後，就恢復正常了！



看效果！

於 6/13/2007 06:35:00 下午 0 意見  

標籤： AS3, Flash, Papervision3D


Papervision3D 教學 part 3 -- 建模

先前的練習，我們都是直接以 PaperVision3D 所提供的基本模型 Cube 來建模，然後你會發現我們貼圖時，會將這個 Cube 的六個面都貼成同樣的材質，但是通常我們的模型上每個面有不同的貼圖，所以以下我做的範例，是先建立一個叫做 item 的 DisplayObject3D，然後在這個 DisplayObject3D 中加入六個 Plane 物件，並為這六個 Plane 進行貼圖，然後將這六個 Plane 組合成 Cube 的六個面向。範例中的其他部分之前提過，包含 camera 照圓心座標旋轉，以及透過 Timer 每隔一秒亂數決定這個我們自製 Cube 中其中一面向換貼圖。程式碼如下：



package {import flash.display.*;import flash.events.*;import flash.utils.*;import org.papervision3d.cameras.Camera3D;import org.papervision3d.scenes.Scene3D;import org.papervision3d.objects.*import org.papervision3d.materials.*[SWF(backgroundColor="#000000", frameRate="60", width="400", height="400")]public class T3step1 extends Sprite{ private static var PI:Number = Math.PI; private static var TH:Number = PI / 180;  private var container:Sprite; private var scene:Scene3D; private var camera:Camera3D; private var rootNode:DisplayObject3D; private var du:Number = 0; private var photoCount:int = 9; private var movingRadius:int = 1000; private var movingHeight:int = 500; private var timer:Timer; public function T3step1() {  // initialize the objects  init3D();   // add a listener for the 3D loop  addEventListener(Event.ENTER_FRAME, loop3D); } private function init3D():void{   container = new Sprite();  addChild(container);   container.x = 200;  container.y = 200;   scene = new Scene3D(container);   camera = new Camera3D();  camera.y = movingHeight;  camera.z = -movingRadius;  camera.zoom = 10;  camera.focus = 100;   rootNode = scene.addChild(new DisplayObject3D("rootNode"));   var ground:DisplayObject3D = rootNode.addChild(new Plane(new ColorMaterial(0xffcc00), 500, 500, 10, 10), "ground");  ground.rotationX = -90;  var item:DisplayObject3D = new DisplayObject3D();  item.addChild(new Plane(new BitmapFileMaterial(getFileName()), 100, 100, 1, 1, {rotationY:0, z:-50}), "p1");  item.addChild(new Plane(new BitmapFileMaterial(getFileName()), 100, 100, 1, 1, {rotationY:90, x:-50}), "p2");  item.addChild(new Plane(new BitmapFileMaterial(getFileName()), 100, 100, 1, 1, {rotationY:-90, x:50}), "p3");  item.addChild(new Plane(new BitmapFileMaterial(getFileName()), 100, 100, 1, 1, {rotationY:180, z:50}), "p4");  item.addChild(new Plane(new BitmapFileMaterial(getFileName()), 100, 100, 1, 1, {rotationX:90, y:-50}), "p5");  item.addChild(new Plane(new BitmapFileMaterial(getFileName()), 100, 100, 1, 1, {rotationX:-90, y:50}), "p6");  item.y = 150;   rootNode.addChild(item, "item");   timer = new Timer(1000, 0);  timer.addEventListener(TimerEvent.TIMER, onTimer);  timer.start(); } private function loop3D(event:Event):void{   var item:DisplayObject3D = rootNode.getChildByName("item");  if(item!=null){   item.rotationX++;   item.rotationY++;   item.rotationZ++;  }  du++;  if(du==360)du=0;   var newX:Number = movingRadius * formatNum(Math.cos(du*TH), 3);  var newZ:Number = movingRadius * formatNum(Math.sin(du*TH), 3);   camera.x = newX;  camera.z = newZ;    scene.renderCamera(camera); } private function formatNum(num:Number, cnt:Number):Number{  return Math.round(num * Math.pow(10, cnt)) / Math.pow(10, cnt); } private function onTimer(event:TimerEvent):void{  var item:DisplayObject3D = rootNode.getChildByName("item");  if(item!=null){   var pName:String = "p" + (Math.floor(Math.random()*6)+1);   var p:DisplayObject3D = item.getChildByName(pName);   if(p!=null){    p.material = new BitmapFileMaterial(getFileName());   }  } } private function getFileName():String{  return "http://ben.rb.chang.googlepages.com/photos"+(Math.floor(Math.random()*photoCount)+1)+".JPG"; }}}


看效果！

於 6/13/2007 04:22:00 下午 1 意見  

標籤： AS3, Flash, Papervision3D


Papervision3D 教學 part 2.3 -- 用外部圖檔做貼圖材質

貼圖材質，除了可以貼純色 (ColorMaterial) 與 BitmapData (BitmapMaterial) 之外，還可以直接拿外部圖檔 (BitmapFileMaterial) 進行貼圖，以下這個範例我就是採用 BitmapFileMaterial 貼圖，並且每隔 3000 微秒就將圖片重新載入貼過！程式碼如下：



package {import flash.display.Sprite;import flash.display.Bitmap;import flash.events.*;import flash.utils.*;import org.papervision3d.cameras.Camera3D;import org.papervision3d.scenes.Scene3D;import org.papervision3d.objects.*import org.papervision3d.materials.*[SWF(backgroundColor="#000000", frameRate="60", width="400", height="400")]public class T2step4 extends Sprite{ private static var PI:Number = Math.PI; private static var TH:Number = PI / 180; private var container:Sprite; private var scene:Scene3D; private var camera:Camera3D; private var rootNode:DisplayObject3D; private var du:Number = 0; private var movingRadius:int = 2000; private var movingHeight:int = 2000; private var photoIdx:int = 1; private var photoCount:int = 9; private var timer:Timer; public function T2step4() {  // initialize the objects  init3D();   // add a listener for the 3D loop  addEventListener(Event.ENTER_FRAME, loop3D);  addEventListener(MouseEvent.MOUSE_WHEEL, onMouseWheel); } private function init3D():void{   container = new Sprite();  addChild(container);   container.x = 200;  container.y = 200;   scene = new Scene3D(container);   camera = new Camera3D();  camera.y = movingHeight;  camera.z = -movingRadius;  camera.zoom = 10;  camera.focus = 100;   rootNode = scene.addChild(new DisplayObject3D("rootNode"));   var ground:DisplayObject3D = rootNode.addChild(new Plane(new ColorMaterial(0xffcc00), 500, 500, 10, 10), "ground");  ground.rotationX = -90;  var myCube1:DisplayObject3D = rootNode.addChild(new Cube(new BitmapFileMaterial(getFileName()), 100, 100, 100, 1, 1, 1), "myCube1");  myCube1.y = 50;  timer = new Timer(3000, 0);  timer.addEventListener(TimerEvent.TIMER, onTimer);  timer.start(); } private function loop3D(event:Event):void{  /*  du++;  if(du==360)du=0;  */   du = 360 * (this.mouseX / stage.stageWidth);   var newX:Number = movingRadius * formatNum(Math.cos(du*TH), 3);  var newY:Number = movingHeight;  var newZ:Number = movingRadius * formatNum(Math.sin(du*TH), 3);   camera.x = newX;  camera.y = newY;  camera.z = newZ;      scene.renderCamera(camera); } private function formatNum(num:Number, cnt:Number):Number{  return Math.round(num * Math.pow(10, cnt)) / Math.pow(10, cnt); } private function onMouseWheel(event:MouseEvent):void{   //event.delta = 3 | -3   movingRadius -= event.delta*10;  if(movingRadius<=0)movingRadius=1;   movingHeight -= event.delta*10;  if(movingHeight<=200)movingHeight=200; } private function onTimer(event:TimerEvent):void{  var myCube1:DisplayObject3D = rootNode.getChildByName("myCube1");  myCube1.material = new BitmapFileMaterial(getFileName()); } private function getFileName():String{  return "http://ben.rb.chang.googlepages.com/photos"+(Math.floor(Math.random()*photoCount)+1)+".JPG"; }}}


測試畫面如下：






同樣的機制，我把先前教過的範例再加上這個週期換圖的效果，感覺又更絢麗了！程式碼如下，每個 Cube 都有自己的 Timer 控制，換圖時間不一定，以亂數決定的！


package {import flash.display.Sprite;import flash.display.Bitmap;import flash.events.Event;import org.papervision3d.cameras.Camera3D;import org.papervision3d.scenes.Scene3D;import org.papervision3d.objects.*import org.papervision3d.materials.* import flash.utils.Timer;import flash.events.TimerEvent;[SWF(backgroundColor="#000000", frameRate="60", width="400", height="400")]public class Step8 extends Sprite{ private var container:Sprite; private var scene:Scene3D; private var camera:Camera3D; private var rootNode:DisplayObject3D; private var AMOUNT:int = 50; private var rotationSettingArray:Array = new Array(); private var timerArray:Array = new Array(); private var photoCount:int = 9; public function Step8() {  // initialize the objects  init3D();   // add a listener for the 3D loop  addEventListener(Event.ENTER_FRAME, loop3D); } private function init3D():void{   container = new Sprite();  addChild(container);   container.x = 200;  container.y = 200;   scene = new Scene3D(container);   camera = new Camera3D();  camera.z = -3000;  camera.zoom = 10;  camera.focus = 100;   rootNode = scene.addChild(new DisplayObject3D("rootNode"));   for(var i:int=0; i<AMOUNT; i++){   var myCube:DisplayObject3D = rootNode.addChild(new Cube(new BitmapFileMaterial(getFileName()), 100, 100, 100, 1, 1, 1), "myCube" + i);   myCube.moveBackward(Math.random() * (3000-100/2+1));     if(Math.random()*2>1)    myCube.moveLeft(Math.random()*500);   else    myCube.moveRight(Math.random()*500);     if(Math.random()*2>1)    myCube.moveUp(Math.random()*500);   else    myCube.moveDown(Math.random()*500);      rotationSettingArray.push({rX:(Math.random()-Math.random())*2         , rY:(Math.random()-Math.random())*2         , rZ:(Math.random()-Math.random())*2});           var timer:Timer = new Timer((Math.round(Math.random()*5)+5)*1000, 0);   timer.addEventListener(TimerEvent.TIMER, onTimer);   timer.start();   timerArray.push(timer);  } } private function loop3D(event:Event):void{   for(var i:int=0; i<AMOUNT; i++){   var myCube:DisplayObject3D = rootNode.getChildByName("myCube" + i);     if(myCube!=null){    myCube.rotationX+=rotationSettingArray[i].rX;    myCube.rotationY+=rotationSettingArray[i].rY;    myCube.rotationZ+=rotationSettingArray[i].rZ;   }  }  scene.renderCamera(camera); } private function onTimer(event:TimerEvent):void{  for(var i:int=0; i<timerArray.length; i++){   if(event.target==timerArray[i]){    var myCube:DisplayObject3D = rootNode.getChildByName("myCube"+i);    var fileName:String = getFileName();    trace(fileName);    myCube.material = new BitmapFileMaterial(fileName);   }  } } private function getFileName():String{  return "http://ben.rb.chang.googlepages.com/photos"+(Math.floor(Math.random()*photoCount)+1)+".JPG"; }}}


看效果！

於 6/13/2007 12:47:00 下午 0 意見  

標籤： AS3, Flash, Papervision3D


Papervision3D 教學 part 2.2 -- 空照 與滑鼠互動

繼續上一篇的 Camera 操控，這次加上滑鼠，左右移動可以控制 camera 繞著圓心做旋轉，然後滾輪的部份，我會用來同時改變 carema 的高度以及繞圓心旋轉的半徑，程式碼如下：



package {import flash.display.Sprite;import flash.display.Bitmap;import flash.events.*;import org.papervision3d.cameras.Camera3D;import org.papervision3d.scenes.Scene3D;import org.papervision3d.objects.*import org.papervision3d.materials.*[SWF(backgroundColor="#000000", frameRate="60", width="400", height="400")]public class T2step3 extends Sprite{ private static var PI:Number = Math.PI; private static var TH:Number = PI / 180;  [Embed(source="../assets/IMG_1054.JPG")] private var CubeTexture:Class; private var container:Sprite; private var scene:Scene3D; private var camera:Camera3D; private var rootNode:DisplayObject3D; private var du:Number = 0; private var movingRadius:int = 2000; private var movingHeight:int = 2000; public function T2step3() {  // initialize the objects  init3D();   // add a listener for the 3D loop  addEventListener(Event.ENTER_FRAME, loop3D);  addEventListener(MouseEvent.MOUSE_WHEEL, onMouseWheel); } private function init3D():void{   container = new Sprite();  addChild(container);   container.x = 200;  container.y = 200;   scene = new Scene3D(container);   camera = new Camera3D();  camera.y = movingHeight;  camera.z = -movingRadius;  camera.zoom = 10;  camera.focus = 100;   rootNode = scene.addChild(new DisplayObject3D("rootNode"));   var ground:DisplayObject3D = rootNode.addChild(new Plane(new ColorMaterial(0xffcc00), 500, 500, 10, 10), "ground");  ground.rotationX = -90;  var cubeTexture:Bitmap = new CubeTexture() as Bitmap;  var myCube1:DisplayObject3D = rootNode.addChild(new Cube(new BitmapMaterial(cubeTexture.bitmapData), 100, 100, 100, 1, 1, 1), "myCube1");  myCube1.y = 50; } private function loop3D(event:Event):void{  /*  du++;  if(du==360)du=0;  */   du = 360 * (this.mouseX / stage.stageWidth);   var newX:Number = movingRadius * formatNum(Math.cos(du*TH), 3);  var newY:Number = movingHeight;  var newZ:Number = movingRadius * formatNum(Math.sin(du*TH), 3);   camera.x = newX;  camera.y = newY;  camera.z = newZ;      scene.renderCamera(camera); } private function formatNum(num:Number, cnt:Number):Number{  return Math.round(num * Math.pow(10, cnt)) / Math.pow(10, cnt); } private function onMouseWheel(event:MouseEvent):void{   //event.delta = 3 | -3   movingRadius -= event.delta*10;  if(movingRadius<=0)movingRadius=1;   movingHeight -= event.delta*10;  if(movingHeight<=200)movingHeight=200; }}}


看效果！

於 6/13/2007 10:43:00 上午 6 意見  

標籤： AS3, Flash, Papervision3D


Papervision3D 教學 part 2 -- 空照

我第二篇 PaperVision3D 的教學，是針對 Camera 的基本操控，這個範例我將 Camera 移到空中 高度 2000 的位置(y=2000)，在 onEnterFrame() 時，會設定 carema 的座標，繞著中心點作旋轉，有點像是衛星移動的感覺。不過若是只對著一個 myCube1 做拍照的話，可能這樣的範例會看不出到底是 myCube1 在自己旋轉，還是 camera 在繞著他旋轉，所以我另外製作了一 Plane 物件名叫 ground 作為地板，預設這個地板是 X-Y 面向的單面，我需要將他順著 X 軸做翻轉，變成 X-Z 面向。



package {import flash.display.Sprite;import flash.display.Bitmap;import flash.events.Event;import org.papervision3d.cameras.Camera3D;import org.papervision3d.scenes.Scene3D;import org.papervision3d.objects.*import org.papervision3d.materials.*[SWF(backgroundColor="#000000", frameRate="60", width="400", height="400")]public class T2step1 extends Sprite{ private static var PI:Number = Math.PI; private static var TH:Number = PI / 180;  [Embed(source="../assets/IMG_1054.JPG")] private var CubeTexture:Class; private var container:Sprite; private var scene:Scene3D; private var camera:Camera3D; private var rootNode:DisplayObject3D; private var du:Number = 0; public function T2step1() {  // initialize the objects  init3D();   // add a listener for the 3D loop  addEventListener(Event.ENTER_FRAME, loop3D); } private function init3D():void{   container = new Sprite();  addChild(container);   container.x = 200;  container.y = 200;   scene = new Scene3D(container);   camera = new Camera3D();  camera.y = 2000;  camera.z = -2000;  camera.zoom = 10;  camera.focus = 100;   rootNode = scene.addChild(new DisplayObject3D("rootNode"));   var ground:DisplayObject3D = rootNode.addChild(new Plane(new ColorMaterial(0xffcc00), 500, 500, 1, 1), "ground");  ground.rotationX = -90;  var cubeTexture:Bitmap = new CubeTexture() as Bitmap;  var myCube1:DisplayObject3D = rootNode.addChild(new Cube(new BitmapMaterial(cubeTexture.bitmapData), 100, 100, 100, 1, 1, 1), "myCube1");  myCube1.y = 50; } private function loop3D(event:Event):void{  du++;  if(du==360)du=0;   var newX:Number = 2000 * formatNum(Math.cos(du*TH), 3);  var newZ:Number = 2000 * formatNum(Math.sin(du*TH), 3);   camera.x = newX;  camera.z = newZ;      scene.renderCamera(camera); } private function formatNum(num:Number, cnt:Number):Number{  return Math.round(num * Math.pow(10, cnt)) / Math.pow(10, cnt); }}}


測試畫面如下：






你可能會發現，在 camera 繞著中心旋轉拍攝時，地面 ground 與 myCube1 某些部份會有些重疊衝突的問題，你需要時時想像，其實我們看到的 " 一個面 "，並不是真的由一個面構成，而是由 PV3D engine 將這個面拆成多個三角形拼貼而成的。對於這個問題，我試圖將 myCube1 的高度拉更高一點，從 myCube1.y = 51 一直拉到 100 以上，這個問題會得到改善，但還是會出現重疊三角形。另一種做法也可以改善這個問題，就是將地面的 segments 增加，由原本的 1 改成 10 以上，這樣一來，地面就是由更多的小三角碎片所組成的，而重疊時會造成的破碎感覺會小一點點，不過想必這樣的運算會比較多，所以，就別介意這種視覺問題囉！以下是改過的程式碼：


package {import flash.display.Sprite;import flash.display.Bitmap;import flash.events.Event;import org.papervision3d.cameras.Camera3D;import org.papervision3d.scenes.Scene3D;import org.papervision3d.objects.*import org.papervision3d.materials.*[SWF(backgroundColor="#000000", frameRate="60", width="400", height="400")]public class T2step2 extends Sprite{ private static var PI:Number = Math.PI; private static var TH:Number = PI / 180;  [Embed(source="../assets/IMG_1054.JPG")] private var CubeTexture:Class; private var container:Sprite; private var scene:Scene3D; private var camera:Camera3D; private var rootNode:DisplayObject3D; private var du:Number = 0; public function T2step2() {  // initialize the objects  init3D();   // add a listener for the 3D loop  addEventListener(Event.ENTER_FRAME, loop3D); } private function init3D():void{   container = new Sprite();  addChild(container);   container.x = 200;  container.y = 200;   scene = new Scene3D(container);   camera = new Camera3D();  camera.y = 2000;  camera.z = -2000;  camera.zoom = 10;  camera.focus = 100;   rootNode = scene.addChild(new DisplayObject3D("rootNode"));   var ground:DisplayObject3D = rootNode.addChild(new Plane(new ColorMaterial(0xffcc00), 500, 500, 10, 10), "ground");  ground.rotationX = -90;  var cubeTexture:Bitmap = new CubeTexture() as Bitmap;  var myCube1:DisplayObject3D = rootNode.addChild(new Cube(new BitmapMaterial(cubeTexture.bitmapData), 100, 100, 100, 1, 1, 1), "myCube1");  myCube1.y = 50; } private function loop3D(event:Event):void{  du++;  if(du==360)du=0;   var newX:Number = 2000 * formatNum(Math.cos(du*TH), 3);  var newZ:Number = 2000 * formatNum(Math.sin(du*TH), 3);   camera.x = newX;  camera.z = newZ;      scene.renderCamera(camera); } private function formatNum(num:Number, cnt:Number):Number{  return Math.round(num * Math.pow(10, cnt)) / Math.pow(10, cnt); }}}