基于OSG添加OPENGL着色语言，通过读入一个文本格式的颜色查找表来更改当前模型的颜色，有助于用户学习OSG与GLSL相结合-Add OPENGL shading language based on OSG, by reading into a text format color lookup table to change the color of the current model, helps users learn OSG combined with GLSL

OpenGL编程指南第七版英文本的pdf格式的电子书-OpenGL Programming Guide for the seventh edition of the English version of the e-book pdf format

用OpenGL读取文本格式的stl文件到环境，并实现旋转。-Read the text with OpenGL stl file format into the environment, and to achieve rotation.