Construction of 3-D model and its visualization of Road based on terrain

This paper combines terrain with the feature of road engineering to set up the constraint Delaunay triangle net in division by terrain characteristic line, and then forming range constraint Delaunay triangle net. With the data of road midcourt line, the road slope toe line and the point of intersection of road slope toe line could be calculated. Terrain characteristic line can be used to construct the model of road and the whole digital terrain. Based on the WINDOWS platform, blend VC++ with OpenGL to build a simple and easy operation on 3-D visualization system of terrain and road. This system consists of four subsystems, namely, data input subsystem, the terrain subsystem, road subsystem and inquiry system. This paper has applied the method to a mountain highway road design from Chengdu to Shenzhen. The method realizes the visualization, which provides a vivid analysing method for the designer to improve the efficiency and quality and has a certain of engineering application value. Case study shows that this proposed model can directly be seen by the 3-D scene, and can be used to optimize the road design plan. Key-Words: terrain, constraint Delaunay triangle net, terrain character line, road, visual simulation