// forked from clockmaker's 3D Flow Simulation with Field of Blur
// forked from clockmaker's 3D Flow Simulation
// forked from clockmaker's Interactive Liquid 10000
// forked from clockmaker's Liquid110000 By Vector
// forked from munegon's forked from: forked from: forked from: forked from: Liquid10000
// forked from Saqoosha's forked from: forked from: forked from: Liquid10000
// forked from nutsu's forked from: forked from: Liquid10000
// forked from nutsu's forked from: Liquid10000
// forked from zin0086's Liquid10000
package 
{
    /**
     * 矢印がいっぱいなんだけど、高速化しないと遅いという比較デモ
     * 矢印 500個
     * @author Yasu
     */
    import flash.display.*;
    import flash.geom.*;
    import flash.events.*;
    import flash.utils.*;
    import flash.geom.*;
    import net.hires.debug.Stats;
    
    [SWF(width="465", height="465", backgroundColor="0xFFFFFF")]
    public class MainGr extends Sprite {
        private const NUM_PARTICLE:uint = 500;
        private var forceMap:BitmapData = new BitmapData( 233, 233, false, 0x000000 );
        private var randomSeed:uint = Math.floor( Math.random() * 0xFFFF );
        private var particleList:Vector.<Arrow> = new Vector.<Arrow>(NUM_PARTICLE, true);
        private var rect:Rectangle = new Rectangle( 0, 0, 465, 465 );
        private var seed:Number = Math.floor( Math.random() * 0xFFFF );
        private var offset:Array = [new Point(), new Point()];
        private var timer:Timer;
        private var world:Sprite = new Sprite();

public function MainGr() {
            
            stage.align = StageAlign.TOP_LEFT;
            stage.scaleMode = StageScaleMode.NO_SCALE;
            stage.frameRate = 60;
            
            addChild(world);
            
            // フォースマップの初期化をおこないます
            resetFunc();
            
            // ループ処理
            addEventListener( Event.ENTER_FRAME, loop );
            
            // 時間差でフォースマップと色変化の具合を変更しています
            var timer:Timer = new Timer(1000)
            timer.addEventListener(TimerEvent.TIMER, resetFunc);
            timer.start();
            
            // パーティクルを生成します
            for (var i:int = 0; i < NUM_PARTICLE; i++) {
                var px:Number = Math.random() * 465;
                var py:Number = Math.random() * 465;
                particleList[i] = new Arrow(px, py);
                world.addChild(particleList[i]);
            }
            
            // デバッグ用のスタッツを表示しています
            addChild(new Stats);
        }
        
        private function loop( e:Event ):void {
            
            var len:uint = particleList.length;
            var col:Number;
            
            for (var i:uint = 0; i < len; i++) {
                
                var arrow:Arrow = particleList[i];
                
                var oldX:Number = arrow.x;
                var oldY:Number = arrow.y;
                
                col = forceMap.getPixel( arrow.x >> 1, arrow.y >> 1);
                arrow.ax += ( (col      & 0xff) - 0x80 ) * .0005;
                arrow.ay += ( (col >> 8 & 0xff) - 0x80 ) * .0005;
                arrow.vx += arrow.ax;
                arrow.vy += arrow.ay;
                arrow.x += arrow.vx;
                arrow.y += arrow.vy;
                
                var _posX:Number = arrow.x;
                var _posY:Number = arrow.y;
                
                arrow.rotation = - Math.atan2((_posX - oldX), (_posY - oldY)) * 180 / Math.PI + 90;
                
                arrow.ax *= .96;
                arrow.ay *= .96;
                arrow.vx *= .92;
                arrow.vy *= .92;
                
                ( _posX > 465 ) ? arrow.x = 0 :
                    ( _posX < 0 ) ? arrow.x = 465 : 0;
                ( _posY > 465 ) ? arrow.y = 0 :
                    ( _posY < 0 ) ? arrow.y = 465 : 0;
            }
        }
        
        private function resetFunc(e:Event = null):void{
            forceMap.perlinNoise(117, 117, 3, seed, false, true, 6, false, offset);
            
            offset[0].x += 1.5;
            offset[1].y += 1;
            seed = Math.floor( Math.random() * 0xFFFFFF );
        }
    }
}

import flash.display.*;

class Arrow extends Sprite
{
    public var vx:Number = 0;
    public var vy:Number = 0;
    public var ax:Number = 0;
    public var ay:Number = 0;

function Arrow( x:Number, y:Number) {
        this.x = x;
        this.y = y;
        
        graphics.beginFill(0xFFFFFF, 1);
        graphics.lineStyle(1, 0x0);
        graphics.moveTo(2, 4);
        graphics.lineTo(8, 4);
        graphics.lineTo(8, 0);
        graphics.lineTo(20, 7);
        graphics.lineTo(8, 14);
        graphics.lineTo(8, 10);
        graphics.lineTo(2, 10);
        graphics.lineTo(2, 4);
    }
}

シェイプだけだともっさりするよ