道路整体模型视相关简化方法研究

为了实现道路景观的实时三维可视化,针对道路整体模型提出了基于边数据结构的视相关动态简化的过程和方法,给出了基于边折叠建立操作层次树的方法,介绍了涉及视锥、背离面方向和屏幕投影误差的视相关准则原理,实现了道路整体模型的视相关动态简化和细化。实践证明:该方法能在保证道路整体模型具有较好视觉效果的前提下,大大降低模型的复杂度,从而达到道路景观实时可视化的要求。

Study of the method of view-dependent simplification of road integrated model

In order to realize real-time visualization of the road 3D scene, based on edge data structure,authors present a view-dependent dynamically simplifying method for road integrated model. It provides a method to construct the operation hierarchy based on the edge collapse, and introduces view-dependent criteria principle of the view frustum, back-face orientation and screen-space geometric error. View-dependent dynamically simplification and refinement of road integrated model are realized. The method can reduce the complexity of the road integrated model greatly as well as it ensures the realistic visual effect, and achieves the demand for real-time visualization of the road 3D scene after successful experiment.