构建一个字符组 更改默认值，换成用户指定变量- default_params- structure, with one field for every potential property/value pair. Each field will contain the default value for that property. If no default is supplied for a given pr

一个3D大厅展览馆的详细例子，通过这个实可以深入了解vrml的潜力-A detailed example of 3D exhibition hall, through which can really understand the potential vrml

使用三维数据库技术开发的简易示例程序，用以展示三维数据库的实际可行性。 在后期版本中还会依次加入业务逻辑、数据挖掘等相关内容，验证三维数据库在商业智能领域与机器学习领域中的潜力。 -Using three dimensional database technology to develop simple example program, used to show the practical feasibility of 3 d database. Will, in turn, in th