In this paper, the mixed modeling method combining surface modeling and volume modeling is used to construct urban subsurface geological structure firstly using existing technique of 3D modeling and visualization for reference, which considers effectively the layer and block structure characteristic inside urban subsurface geological body. Then, volume visualization scheme is designed and 3D volume visualization of subsurface quaternary geological structure is made based on Visual C++.NET and OpenGL in a city of eastern China. Many functions have been achieved, such as monolayer and multilayer visualization display of geological body and multi-angle of view dynamic display including zooming in, zooming out, rotation and roam of urban subsurface geological body. 3D inner geological structure of urban subsurface geological body also is displayed preferably through linear cutting, slope cutting, poly-line cutting and polygon cutting etc.
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机译：本文首先采用表面建模与体积建模相结合的混合建模方法，以现有的3D建模和可视化技术为参考，构建城市地下地质结构，有效地考虑了城市地下地质主体内部的层状和块状结构特征。然后，设计了体积可视化方案，并基于Visual C ++。NET和OpenGL在东部城市中进行了地下第四纪地质构造的3D体积可视化。已经实现了许多功能，例如地质体的单层和多层可视化显示以及包括城市地下地质体的放大，缩小，旋转和漫游的多视角动态显示。还优选通过线性切割，坡度切割，折线切割和多边形切割等方式显示城市地下地质体的3D内部地质结构。
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