三维地形的真实感实现

三维真实感地形的生成是科学可视化、计算机动画和虚拟现实的技术核心,也是时空一体化地理信息系统的关键技术,而OpenGL又是最新的三维图形的国际标准,实现地形的真实感显示,其目的是使三维地形景观直观、逼真,交互地显示在计算机屏幕上。涉及的主要技术有纹理映射、高度图、光照模型等。文章介绍了真实感地形绘制中的一些关键技术,阐述在OpenGL程序中如何将其实现,并改进原有的纹理映射技术,提出混合纹理算法,根据地形高度值的不同,采用不同的纹理进行映射,简化了真实感地形绘制的工作。绘制结果逼真,在3D游戏、虚拟现实中有一定的应用价值。

Realization of Realistic 3D Terrain

The generation of realistic 3D terrain plays an important part in terrain visualization.The purpose of visualization is to enable intuitive,realistic and interactive 3D landscape display on the computer screen.The main technologies are texture mapping,height map and illumination model,etc.Realization of some key techniques for realistic 3D terrain visualization in OpenGL program is discussed.The original texture mapping technology is improved and a mixed texture algorithm is proposed. By different methods of texture mapping based on different terrain height, the plot of realistic 3D terrain can be simplified with ideal results.