速度是3D程序中最重要的指标，你必须限制绘制的多边形的个数，或者提高显卡绘制多边形的效率。显卡最近增加了一个新的扩展，叫做顶点缓存VS，它直接把顶点放置在显卡中的高速缓存中，极大的增加了绘制速度。 -The speed is the most important indicator of the 3D program, you must limit the number of polygon draw, or to improve the efficiency of the graphics

irrlicht is very famous real time 3d engine.A new C++ class CbashingClass is created as an extension to Decal manager class . The class merges all decal nodes to one mesh class. This method lowers draw count and improving FPS.