基于OpenGL的三维地形的模拟

摘要

3D terrain simulation is always a hot topic in geographic information system( GIS ), virtual reality and so on. An algorithm for constructing polygon meshes based on different levels is presented, which uses texture mapping to terrain LOD and interpolate the location of element in meshes to realize smooth transitions between models. The technology could reduce the complexity of scene properly and the distortion is also lessened. This algorithm is finished on VC ++6.0 platform with OpenGL programming technique. The testing results show the efficiency of algorithm is high on both time and memory and the algorithm supports simulation of large scale 3D terrain.%三维地形模拟一直是虚拟现实、地理信息系统(GIS)等领域的研究热点.提出了一种基于不同层次的多边形网格模型的地形生成算法,采用多重纹理映射技术,通过插值对应网格基本元素的位置实现模型之间的平滑过渡并生成地形连续LOD模型.通过该技术可以简化场景的复杂度,并对图形的真实感程度损失比较小.该算法是在VC++6.0平台上利用OpenGL编程技术实现的.实验表明:该算法具有较低的时间和空间开销,适合大规模三维地形的模拟.