1，Flash Player 9中的跳桢问题

Flash Player 9应当退出历史舞台了，余不待说，仅是异步跳桢这一个理由便充分了。在Flash Player 9中，以下代码将返回null:

// go to a specific frame where myDisplayObject is located
container.gotoAndStop ( 25 );
// output : null
trace( container.myDisplayObject );//该对象位于第25桢中

而在Flash Player 10中，它却可以返回实例。

2，另一个Flash Player 9的关于gotoAndStop的bug

设主场景中有一mc，此mc中有两桢，第二桢代码为：

trace(2)

主场景第一桢代码为：

mc.gotoAndStop(2);

毫无疑问，输出应该是:

2

然而实际却是:

2

2

这是Flash Player 9的一个bug，在Flash Player 10中不存在这个问题。

3，Flash Player 9与10的跳桢区别

Flash Player 9的跳桢是异步的，而10的跳桢却是同步的。

当gotoAndStop发生时：

4，Flash Player如何比对静态对象是否相同

1) 如果静态对象在新桢中没有新的关键桢，则一定保留

2) 如果静态对象在新桢中有新的关键桢，但该对象未与任何类关联，则保留，否则移除

5，两个版本跳桢的不同对桢周期的影响

在Flash Player一个完整的桢周期中，共做两件事情：执行代码与渲染，又细分为五小步：

1) Player事件调度 – 比如Timer事件，鼠标事件，ENTER_FRAME事件，URLLoader事件等等。

2) 用户代码执行 – 所有侦听上一步相应事件的代码被执行。

3) RENDER事件调度 – 在用户代码执行期间调用stage.invalidate()会触发这一特殊事件。

4) 最后的用户代码执行 – 侦听上述第三步特殊事件的用户代码此时被执行。

5) Player更改显示列表。

在第2小步时，在Flash Player 9中，包括执行桢代码，这是由对enterFrame监听引起的；而在Flash Player 10中，同样的桢代码是在第1小步内执行完成的。Flash Player 10对跳桢的改进有利于减少桢周期中代码执行的环节。

sban 2010/8/31 北京。转载请注明作者及出处，非商用。本文属于《AS3 Expert》的一部分。

var v :View3D = new View3D({x:200, y:200, color:0xffff0000});
var cube : WireCube = new WireCube();//sban
var cm: WireframeMaterial = new WireframeMaterial(0xffff0000);
cm.wireAlpha=0.5;
cube.material = cm;
cube.rotationX=15;
cube.v000.x -= 10;
cube.v010.x -= 10;
cube.v110.x += 10;
cube.v100.x += 10;
v.scene.addChild(cube);
addChild(v);
v.render();

sban 2010/8/7 Beijing

Becuse transparent, we can see it’s back outlines.If we use Cube create it like this:

var v :View3D = new View3D({x:200, y:200, color:0xffff0000});
var cube :Cube = new Cube();//sban
var cm: WireframeMaterial = new WireframeMaterial(0xffff0000);
cm.wireAlpha=0.5;
cube.material = cm;
cube.rotationX=15;
cube.rotationY=15;
cube.rotationZ=15;
v.scene.addChild(cube);
addChild(v);
v.render();

it’s NOT what we want

This code can show the back outlines:

cube.bothsides=true;

But we can not remove the catercorner where each face. If we increase segment like this:

cube.segmentsW=2;
cube.segmentsH=2;

My God!It dose not help much. Away3d use triangle to draw the segment in cube, in other words, every segment contains two triangles in cube. May be not we achieved with cube.So I sue WireCube as follows:

var v :View3D = new View3D({x:200, y:200, color:0xffff0000});
var cube : WireCube = new WireCube();//sban
var cm: WireframeMaterial = new WireframeMaterial(0xffff0000);
cm.wireAlpha=0.5;
cube.material = cm;
cube.rotationX=15;
cube.rotationY=15;
cube.rotationZ=15;
v.scene.addChild(cube);
addChild(v);
v.render();

Wire 3d object can not be set segment number.

BS:Outline property of the 3d object can highlight the bounds.

sban 2010/8/7 北京

Awayd is a great realtime 3d engine for flash application.This post demonstrates how to get started with away3d 3.5.Now, let us use away3d create a cube…

1,download the 3.5 version and import into your project
2,write the following code into your entry file:

var v:View3D = new View3D({x:200, y:200, color:0xffff0000});
var cube:Cube = new Cube({width:150, height:150, depth:150});
v.scene.addChild(cube);
addChild(v);
v.render();

compile and run it, you will see:

It’s a cube, but it looks like a square.Insert the following code:

cube.rotationX=15;
cube.rotationY=15;
cube.rotationZ=15;

got this:

The three-demensional coordinate is as follows

If face the direction of the x, yaxis, the rotation is inverse hour, but the z is clockwize.Why not same?

View3D is a container used for storing camera, scene, session, renderer and clip references, and resolving mouse events. Every time after changing the properties of the 3d object, must explicitly call the view3d’s render method.

We cant paste a material to the cube faces like this

cube.material = new BitmapMaterial( (new myTexture as Bitmap).bitmapData );
...
[Embed (source="meta2.jpg")]
private var myTexture:Class;

or use BitmapFileMaterial:

cube.material = new BitmapFileMaterial("meta2.jpg");

Now, how to make the material looks a lit lax? clip the image or the bitmap.

var b :Bitmap = new myTexture as Bitmap;
var bd :BitmapData = new BitmapData(50,50);
bd.draw(b, null, null,null,new Rectangle(0,0,50,50));
cube.material = new BitmapMaterial( bd );

source and demo download from here:

http://sban.googlecode.com/svn/trunk/blog/away3d/CubeE.as

http://sban.googlecode.com/svn/trunk/blog/away3d/CubeE.swf

away3d library download from here plz:

http://away3d.com/download/away3d_3_5_0.zip

sban 北京 2010/8/7