现代路线CAD系统关键技术研究

综合应用计算机图形学、计算几何及几何造型学、科学计算可视化、人机交互、虚拟现实、计算机动画等理论和技术，针对现代路线CAD系统中的数字地面模型、路线交互设计、路线三维实体造型、路线三维模型简化、真实感图形绘制及路线三维场景的实时动态显示等关键技术进行深人细致的研究。通过深人剖析传统的路线二维平、纵、横设计与三维可视化设计之间的关系，论述二者不是互相取代、此消彼长，而是互为补充、相辅相成的关系，应紧密结合、综合运用。基于这一思想，

Study on Key Technologies in Developing Modern Road CAD System

This thesis applied synthetically the theories and technologies of computer graphics, computational geometry and geometrical modeling, scientific computation visualization, interactive, virtual reality,computer animation etc to research thoroughly and carefully on several critical technologies of computer aided alignment design, such as digital terrain model,interactive alignment, 3D modeling of route entity,simplification of 3D model, showing realistic image and dynamic and real time display of 3D route scene etc. By thoroughly analyzing the relationship between the 2D horizontal,