地图的瓦片分割显示原理的剖析，深入透析Google Map的客户端地图显示机理-Map shows principle of split tile analysis, in-depth client dialysis Google Map map display mechanism of

obj文件解析出来的深度图和纹理图，可以用于openGL的纹理贴图处理-obj file parsing out the depth map and texture map that can be used for texture mapping processing openGL