月球三维仿真与演示系统的关键技术及方法研究

发布时间：2018-04-27 06:41

本文选题：虚拟月球 + 海量数据　；参考：《天津理工大学》2013年硕士论文

【摘要】：借助于嫦娥一号星载CCD相机和激光高度计等设备，我们获得了描述月表形貌特征的海量月表地形数据。为此本文主要研究构建多尺度月表地形三维模型的若干关键技术，包括全月球海量地形数据的组织与管理、多尺度月表地形数据模型结构建立、月表地形数据实时渲染、三维月表地形的查询与漫游，在此基础上设计并实现三维月表地形的实时渲染仿真系统。本论文的主要成果与创新可以概括如下： 1、基于小波建立四叉树结构对海量月表地形数据进行空间的月表地形数据的分块组织，，结合大型数据库管理系统对二进制的数据流的存储和组织特点，以及月表地形数据块的位置编码创建其索引机制。同时采用并行调度策略实现数据库服务器到终端机的月表地形数据的加载以及两者间的数据交换。实现了海量月表地形数据的存储、管理和动态装载。 2、对采用上述策略动态加载到前端页面缓冲区的月表地形数据采用非规则动态三角网格法构建多尺度月表地形模型。将Mipmap技术与纹理压缩算法相结合，构建了多尺度月表地形的纹理模型。 3、基于本文提出的数据的快速调度(或称索引)和快速渲染技术构建一个快速精确的渲染引擎，实现全月球地形数据的可视化，结合LOD技术的数据存取机制实现了海量月表三维地形景观的实时渲染和漫游，实验表明已达到60帧/秒以上的渲染速度。 4、最后采用空间三次样条曲线理论构建视点运动轨迹的控制算法，实现对月表地形不同地点之间的实时查询。
[Abstract]:With the aid of Chang 'e-1 spaceborne CCD camera and laser altimeter, we have obtained massive topographic data describing the features of lunar surface topography. For this reason, this paper mainly studies some key technologies of constructing the multi-scale monthly surface terrain 3D model, including the organization and management of the lunar massive topographic data, the establishment of the multi-scale monthly surface terrain data model structure, and the real-time rendering of the monthly surface topographic data. On the basis of the query and roaming of 3D lunar surface terrain, a real-time rendering simulation system is designed and implemented. The main achievements and innovations of this paper can be summarized as follows: 1. Based on wavelet, the quadtree structure is established to organize the spatial monthly topographic data of massive monthly table, combining with the characteristics of storing and organizing binary data stream in large database management system. And the location coding of the topographic data block of the monthly table to create its indexing mechanism. At the same time, the parallel scheduling strategy is used to realize the loading of the monthly topographic data from the database server to the terminal and the data exchange between the two. The storage, management and dynamic loading of massive monthly topographic data are realized. 2. For the monthly topographic data which is dynamically loaded into the front page buffer by the above strategy, the multi-scale monthly table terrain model is constructed by using the irregular dynamic triangular grid method. The texture model of multi-scale monthly table terrain is constructed by combining Mipmap technology with texture compression algorithm. 3. Based on the data fast scheduling (or index) and fast rendering technology proposed in this paper, a fast and accurate rendering engine is constructed to realize the visualization of lunar terrain data. Combined with the data access mechanism of LOD technology, the real-time rendering and roaming of massive monthly table 3D terrain and landscape are realized. The experimental results show that the rendering speed is over 60 frames per second. Finally, the control algorithm of view trajectory is constructed by using spatial cubic spline curve theory, and the real-time query between different locations of the lunar surface terrain is realized.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P184;TP391.41

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