利用层级建模方法设计并实现一个物体，至少由三部分组成，并可交互控制其相对运动。 opengl-Modeling method using the level design and implementation of an object, at least three parts, and interactive control of their relative motion. opengl

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