用3d建模工具建好三维模型后，导出为mesh文件，本程序就是把3d mesh转换为高度图，从而为读取高度图建立三维模型打下基础，实现加速显示的目标。-3d modeling tool built with three-dimensional model, export mesh file, the program is to 3d mesh into a high figure, so as to read a three-dimensional model of a high figure t