湿地DEM生成的三维,支持dem动态载入，场景缩放，场景漫游-Wetlands DEM generated three-dimensional, dynamic loading support dem, scene zoom, scene roaming

流体产生的代码，利用正弦波的叠加方法，很有用，请珍藏。-Fluid generated code, using sine wave superposition method is useful, please treasure.