Research & Development For The Digital Simulation Software Of 3D Terrain In Dredging Project

Dredging is used widely in transportation, port construction, ocean exploration and waterway regulation, and it plays a very important role in the economy development and the improvement of resident environment. The development for the digital simulation software of 3D terrain in dredging project can assist the dredging and manage the dredging project with high-tech fruits. The effective using of this software is important in the realization of automation and intelligence in dredging project.This paper researches and develops the digital simulation software of 3D terrain in accelerating the producing speed of plane triangle-net, the smoothing of waterway depth contour, the construct of waterway curve plane function, the drawing of 3D graphics and the waterway simulation.In the aspect of waterway plane triangle-net, waterway division is used to accelerate the producing speed of plane triangle-net, and a new method of division is presented. Some discrete points are added in division lines, so the plane triangle-nets have same borderlines and the difficulty of waterway division is solved. The triangle-net is suitable for the request and the producing speed of plane triangle-net increases markedly.This paper presents a new method of waterway depth contour smoothing. The waterway depth contour can be adjusted artificially in certain field. So the across of depth contours can be avoided effectively. In addition, the precision of depth contours is high and the speed of drawing is fast.In this paper, the waterway curve plane function is established with move fit method to calculate the depth value of grid points, and in part fields linear method is adopted because of the distributing scrambling of waterway measure points. As a result of the use of two methods, not only the calculating precision is high but also the calculating speed is very fast.In the drawing of waterway 3D graphics, this software draws the 3D model with OpenGL function, romances it and simulates the waterway with the means of zooming in, zooming out, translating, rotating and the rotating of lamp. Thewaterway can be observed all-sided.In the development of this software, OpenGL class module is established in Visual Basic to drawing graphics. Not only the effect of the graphics is good but also the development of program is simple, rational and easy to be maintained. This method has a certain application value.