详细介绍了虚拟环境中的自我学习技术，对虚拟技术的研究进行了扩展-Details of the virtual environment in self-learning technology, virtual technology, the study was extended

OPENGL中构建天空和地面的例子，可以学习来构建虚拟环境等-OPENGL example of building in the sky and the ground