三维数字城市建模集体方案，大规模城市级别的建模规则，对于三维建模人员，特别是使用osg作为引擎的建模人员非常有用，告诉你如何制作高质量的模型，同时又不让模型过于庞大-3D digital city model of collective programs, large-scale urban-level modeling rules for three-dimensional modeling staff, particularly the use of osg as the engine mo