全球虚拟地形环境中Mipmap纹理技术研究

M ipm ap纹理技术是目前解决纹理分辨率与视点距离关系的最有效途径。将M ipm ap纹理引入全球虚拟地形环境的金字塔模型中,在分析现有M ipm ap纹理生成技术不足的基础上,提出了一种新的M ipm ap纹理生成技术,并针对M ipm ap纹理以多级形式存储会使数据量增加的问题,提出了M ipm ap纹理压缩算法,以提高实时渲染中M ipm ap纹理的装载速度和创建速度,并用实验结果验证了算法的可行性。最后给出了全球金字塔模型中M ipm ap压缩纹理的存储结构。

Research of Mipmap Textures for Virtual Global Terrain Environment

Mipmap is the best way to make the texture resolution suitable for viewpoint position,which means that the nearer the viewpoint is to the 3D object,the higher texture resolution it requires,and the farther,the lower.The author introduces Mipmap texture into Virtual Global Terrain Environment,just to make it one part of the Pyramid Model and make the simulation more quick and more realistic.First,the author puts forward a new way of generating Mipmap textures,to make up for the disadvantages of current Mipmap texture generation methods.As Mipmap textures may expand the Pyramid Model,the author then discusses how to compress Mipmap textures in an effective way,which can not only decrease the textures' storage,but also speed up the loading and creation of Mipmap textures during real-time rendering.Meanwhile,some experiments are done to demonstrate the performance of these methods. At last,the author shows us how to save compressed Mipmap textures in the Pyramid Model.