Away3D 4.0 beta のプリミティブの中心点をずらす

GeometryApplyTransformation.as

/**
 * copyright (c) 2012 www.romatica.com
 * @auther itoz
 */
package 
{
    import away3d.containers.View3D;
    import away3d.entities.Mesh;
    import away3d.materials.TextureMaterial;
    import away3d.primitives.CubeGeometry;
    import away3d.textures.BitmapTexture;

    import flash.display.BitmapData;
    import flash.events.Event;
    import flash.geom.Matrix3D;

    [SWF(width='800',height='600',frameRate='60',backgroundColor='#000000')]
    /**
     * Away3D 4.0 beta のプリミティブの中心点をずらす
    * 動作サンプル
    * @see http://dl.dropbox.com/u/958512/sample/away3d4/applyTransformation/index.html
    *    
    * pivotPoint movePivot という中心点を操作する？とおもわれる物があるが、現時点(2012.2.29)はまだ動かないぽい?
    * http://away3d.com/forum/viewthread/124/
    * http://away3d.com/forum/viewthread/1680/
    * のでapplyTransfomationを使ってみた
     */
    public class GeometryApplyTransformation extends View3D
    {
        private var _cubeData : CubeGeometry;
        private var _cube : Mesh;
        private var _mat3d : Matrix3D;

        public function Main()
        {
            backgroundColor = 0xc1c4c1;
            antiAlias = 4;
            var material : TextureMaterial = new TextureMaterial(new BitmapTexture(new BitmapData(32, 32, false, 0x56a0b6)));
            _cubeData = new CubeGeometry(100, 400, 100, 4, 4, 4);
            _cube = new Mesh(_cubeData, material);
            _mat3d = new Matrix3D();
            _mat3d.appendTranslation(0, -200, 0);
            _cube.geometry.applyTransformation(_mat3d);
            scene.addChild(_cube);
            addEventListener(Event.ENTER_FRAME, onUpdate);
        }

        private function onUpdate(event : Event) : void
        {
            _cube.rotationX += 4;
            render();
        }
    }
}

html：preview.html

params.wmode = "direct";