读取STL格式文件代码，通过建表简化拓扑结构，获取模型的最大值，最小值等参数。-STL format file to read the code, through the construction of simplified topology table, access to model maximum and minimum values ??and other parameters.

自己编写的，读取、保存stl和obj格式的文件的代码-I have written, read, save the stl and obj format file code