SphericalCoordinates.as

        private static var MAXIMUM_POOL_LENGTH:uint = 5000;
        private static var POOL:Array = [];

        public function SphericalCoordinates(azimuth:Number = 0, elevation:Number = 0,
                radius:Number = 1) {
            this.elevation = elevation;
            this.azimuth = azimuth;
            this.radius = radius;
        }

        public static function fromCache(azimuth:Number = 0, elevation:Number = 0,
                radius:Number = 1):SphericalCoordinates {
            var sp:SphericalCoordinates;
            if (POOL.length > 0){
                sp = POOL.pop();
                sp.azimuth = azimuth;
                sp.elevation = elevation;
                sp.radius = radius;
            } else {
                sp = new SphericalCoordinates(azimuth, elevation, radius);
            }
            return sp;
        }

        public function destroy():void {
            if (POOL.length < MAXIMUM_POOL_LENGTH) {
                POOL.push(this);
            }
        }