as3.0打造音乐控制光的变化

这个例子展示的是一个球体，它上面由很多小三角面组成，这些小的三角面可以随着音乐的变化进而变换色彩。下面是这个例子的源代码。

import flash.display.*;
import flash.events.*;
import flash.media.Sound;
import flash.media.SoundMixer;
import flash.net.URLRequest;
import flash.utils.ByteArray;

import flash.display.Bitmap;
import flash.display.BitmapData;

import org.papervision3d.scenes.*;
import org.papervision3d.objects.*;
import org.papervision3d.cameras.*;
import org.papervision3d.materials.*;
import org.papervision3d.events.*;
import org.papervision3d.core.proto.DisplayObjectContainer3D;

import com.mrdoob.pv3d_phunky.objects.*;
import com.mrdoob.utils.*;

import caurina.transitions.Tweener;

// .. VARS .....................................................................................................               

var container                :Sprite;
var containerPos        :Sprite;
var bitmapPos                :BitmapData;

var mtr                                :Matrix;

var scene                     :MovieScene3D;
var camera                    :Camera3D;
var root3D                           :DisplayObject3D;
var sound                          :Sound;
var bytes                          :ByteArray;
var amount                          :Number = 15;
var values                          :Array;

var resetPos        :Number = 0;

// .............................................................................................................

stage.quality = "MEDIUM";
stage.scaleMode = "noScale";
stage.align = "TL";

stage.addEventListener(Event.RESIZE, resizeHandler);

function resizeHandler(e)
{
        mtr = new Matrix();
        mtr.translate(stage.stageWidth * .5,stage.stageHeight * .5);
        mtr.scale(.01,.01);
        container.x = stage.stageWidth * .5;
        container.y = stage.stageHeight * .5;
        containerPos.width = stage.stageWidth;
        containerPos.height = stage.stageHeight;               
}

init3D();
init();       
resizeHandler(null);
generateCameraPath();
this.addEventListener( Event.ENTER_FRAME, loop3D );

// .. INIT .....................................................................................................               

function init()
{
        addChild(np);
        np.buttonMode = true;
        np.addEventListener(MouseEvent.CLICK, goToURL);
}

// .. CUSTOM FUNCTIONS .........................................................................................               

function generateCameraPath()
{
        var bz = new Array();
        var bz_t = new Array();
       
        for (var i = 0; i < 100; i++)
        {
                bz.push({x:Math.random()*3000-1500,y:Math.random()*3000-1500,z:Math.random()*3000-1500});
                bz_t.push({x:Math.random()*2000-1000,y:Math.random()*200-100,z:Math.random()*2000-1000});               
        }
       
        Tweener.addTween(camera,{x:2000,y:2000,z:0,_bezier:bz,time:1000,transition:"linear"});
        Tweener.addTween(camera.target,{x:0,y:0,z:0,_bezier:bz_t,time:1000,transition:"linear"});
        Tweener.addTween(this,{time:1000,onComplete:function(){generateCameraPath()}});
}

function goToURL(e)
{
        navigateToURL(new URLRequest("http://www.scene.org/~gloom/"));
}

// .. INIT 3D ...................................................................................................       

function init3D():void
{
        // Create canvas movieclip and center it
        container = new Sprite();
        addChild( container );
       
        containerPos = new Sprite();
        bitmapPos = new BitmapData(Math.floor(stage.stageWidth * .01), Math.floor(stage.stageHeight * .01), false, 0x000000);
        containerPos.addChild(new Bitmap(bitmapPos,"auto", true));
        containerPos.blendMode = BlendMode.ADD;
        addChild( containerPos );

        // Create scene
        scene = new MovieScene3D( this.container );

        // Create camera
        camera = new Camera3D();
        camera.x = 2000;
        camera.y = 500;
        camera.z = 500;
        camera.zoom = 5;
        camera.focus = 100;
        camera.sort = false;

        var sound:Sound = new Sound();
        sound.load(new URLRequest("gloom_and_flipside-evoid_droid.mp3"));
        sound.play();               
        bytes = new ByteArray();
       
        var p:DisplayObject3D;
        var spacingx:Number = 0;
        var spacingz:Number = 0;
       
        values = new Array();
        this.scene.renderCamera( this.camera );               

        for (var x:Number = 0; x < amount; x++) {
                for (var z:Number = 0; z < amount; z++) {
                        values[x+(z*100)] = 0;
                        p = scene.addChild( new Pyramid( new ColorMaterial( 0xffffff ), 100, 100, 1, 1 ), "tile"+x+"_"+z );
                        p.container.blendMode = BlendMode.ADD;
                       
                        p.x = Math.random()*1000 - 500;
                        p.y = Math.random()*1000 - 500;
                        p.z = Math.random()*1000 - 500;
                       
                        var l:DisplayObject3D = new DisplayObject3D();
                        l.x = 0;
                        l.y = 0;
                        l.z = 0;
                        p.lookAt(l);

                        p.pitch(-90);
                }
        }
       
}

// .. LOOP 3D ...................................................................................................

function loop3D( event :Event ):void
{
        SoundMixer.computeSpectrum( bytes, true, 0 );
        var value: Number = 0;
        var scale: Number = 3;
        var bias:  Number = 1;
       
        for (var x:Number = 0; x < amount; x++) {
                for (var z:Number = 0; z < amount; z++) {

                        value = bytes.readFloat()* (scale+bias);
                        bias += 0.1;
                        var tile:DisplayObject3D = scene.getChildByName("tile"+x+"_"+z);
                        values[x+(z*100)] += 1;
                       
                        if (-value < values[x+(z*100)]) {
                                values[x+(z*100)] = -value;
                        } else if (values[x+(z*100)] > 0) {
                                values[x+(z*100)] = 0;
                        }

                        tile.geometry.vertices[3].y = -values[x+(z*100)]*50;
                        tile.material = new ColorMaterial(ColorTools.getHex(tile.geometry.vertices[3].y*.002+.1,tile.geometry.vertices[3].y*.0008,tile.geometry.vertices[3].y*.0002+.05));

                }               
        }
       
        scene.renderCamera( camera );
        bitmapPos.colorTransform(new Rectangle(0,0,bitmapPos.width,bitmapPos.height),new ColorTransform(1,1,1,1,-100,-100,-100,0));
        bitmapPos.draw(container,mtr,null,null,new Rectangle(0,0,stage.stageWidth,stage.stageHeight));

}