STL三维图形文件读取及显示，对三维图形建模等功能有参考意义，用OPENGL实现-STL 3D graphics file read and display three-dimensional graphics modeling reference, with OpenGL

基于Qt5开放的STL分层软件,可以实现指定分层次数，获取3D图案的轮廓数据-Based Qt5 open STL layered software, you can achieve the specified number of hierarchical obtain 3D pattern outline data