摘要
针对三维地质建模工作非常繁琐和复杂,为降低操作人员的劳动强度和提高模型可视化效果,提出一种基于结合限定Delaunay三角剖分和OpenGL进行三维地层可视化的方法。利用限定三角剖分算法可以生成任意边界形态、任意尺寸大小或者带有多个孔洞的地层表面三角网;利用OpenGL的对象拾取机制实现钻孔数据的可视化管理和人机交互地层建模。同时将该方法应用于三维地层可视化系统开发中,系统克服了手工填加虚拟钻孔来提高模型精度的麻烦,可以显著提高三维地层建模的效率和可视化效果。最后利用南京某地区三维地质调查项目地质勘察获取的钻孔数据,进行了实际建模操作。实验结果表明,系统能够快速、准确地构建地层的三维模型,并实现多种模型可视化,为工程勘察信息的管理和分析提供了科学、高效的技术手段。
3D geological modeling is very cumbersome and complex,in order to simplify the complex 3D modeling flow and reduce the work strength,this paper proposed a 3D geological stratum visualization method based on Conforming Delaunay triangulation and OpenGL.The conforming delaunay triangulation algorithm is used for generating stratum surface triangular net with arbitrary shape,size and multiple holes and its principles and key technology includes： First,the borehole data are read by VC＋＋ for 3D visualization with OpenGL,the borehole 3D data visualization management module is implemented using OpenGL object-picking mechanism;Second,the conforming Delaunay triangulation algorithms are packed into a static library for generating the stratum surface triangular nets.Third,in order to avoid the algorithm defects which cannot generate the topology of boundary line points,the human computer interaction method is used for sealing the boundary surfaces.In addition,the method has been applied in the development of a 3D stratum visualization system,which provides multi-view user interface,and user can construct 3D stratum model easily,and improve the modeling efficiency and visualization effects significantly.Last,the borehole data acquired from the geological exploration of a 3D city survey project is taken for modeling and visualization experiment,and the test results show that the system can construct 3D stratum model rapidly and accurately,and provide a scientific and efficient method for information management and analysis of geotechnical investigation and survey.
出处
《工程勘察》
2013年第9期56-60,64,共6页
Geotechnical Investigation & Surveying
