摘要
大规模地形场景的实时绘制在虚拟现实、地理信息系统、战场仿真等领域有着广泛的应用。为满足船舶模拟训练系统中视景仿真的需求,对大规模地形场景的建模与实时绘制技术进行了研究。首先对比了几类常用数据插值方法,采用数据融合的方式对DEM数据进行了插值。通过结合模拟训练的实际,提出了一种基于可见性判断的地形剔除方法,通过放射状搜索,判断当前点是否遮挡,进而对被遮挡点进行剔除处理,可以有效减少地形建模中无关面片,提高绘制速率。利用Google Earth获取地形纹理,使用Terri Vista构建三维地形,实现了地形的三维建模。试验表明提出的方法可实现大规模地形场景的高效逼真绘制。
Real-time rendering of large scale terrain plays an important role in virtual reality, battlefield simulation and training areas and so on. To meet the requirements of scene simulation in ship navigation training, the modeling and rendering of large scale terrain are studied. Some usual DEM interpolation is studied at first, and then the DEM interpolation based on data fusion is used. According to the practice of navigation training, a terrain culling method based on visibility estimation is proposed. The method uses radiated ray and searches for if there are points whose height is larger than the occlude ones. If there is a point with a larger height in all direction, it means that this point is being occluded. We cull all the occluded points to reduce the terrain model. At last, a terrain modeling method based on Google earth and Terri Vista is introduced. The results show that this method can get a good performance in real-time with no hurt to the verisimilitude.
出处
《图学学报》
CSCD
北大核心
2013年第1期128-132,共5页
Journal of Graphics
基金
国防预研基金资助项目
关键词
地形
建模
可见性剔除
视景仿真
terrain
modeling
visibility culling
scene simulation
