三维GIS渲染引擎的关键技术

随着计算机图形技术的不断发展和人们对视觉要求的不断提高,三维GIS场景的复杂度也在增大。本文在分析三维GIS场景特点的基础上,提出了三维GIS渲染引擎的概念,并分析了渲染引擎在降低三维GIS开发复杂度和提高软件可重用性中的作用。重点探讨了3DGIS中,针对大数据量复杂实时场景进行快速、高效渲染的关键技术,如场景图、层次细节、视锥体剔除、遮挡面剔除、渲染通道等,并对技术原理进行了详细的分析,最后,通过具体的实验验证了这些技术的可用性和有效性。

A Discussioin on Key Techniques in 3D GIS Rendering Engine

With the fast development of Computer Graphics and the increase of visual need of the people,3DGIS has become the main trend in GIS. But the way people can get spatial data has been improved greatly which made the explosion of the spatial data that GIS can handle and increased the complexity of the 3DGIS scenes. Besides, to be real-time is also a must in 3D system,all of these challenge the research and development of 3DGIS software.In this situation, based on the analysis of the key features of the 3DGIS, this article presented the definition of the 3DGIS Rendering Engine, and offered some key techniques to render complex, large scale 3DGIS scenes, such as SceneGraph, Level of Detail, View Frustum Culling, Occulding Culling, Rendering Pipe, etc. The author also explained clearly the theory behind them and proved the efficiencies of these techniques through experiment. Besides that, this arcticle presented that 3DGIS Rendering Engine, as the core of 3DGIS, can also decrease the difficulties of the development of 3DGIS and increase the reusability of the software.