Chunkedlod-real-time Rendering System Of Mass Terrain

Real time terrain rendering is an important technology for a large class of applications, such as game and simulation. Hardware and algorithms are being improved rapidly, which enhances our ability to render realistic terrains. In recent year, in consumer hardware, there is a trend to shift the CPU-bound graphics processing capability to high speed special purpose graphics processing units (CPU's ). This trend has drastically changed the algorithms in terrain LOD rendering, and sparkled the development of GPU-oriented aggregated LOD algorithms. Furthermore, by using the database with increased quantity and details need to handle the datasets which do not fit in RAM (out-of-core datasets ). Meanwhile, advances in shading and image quality in general have raised the bar for image quality we would like to achieve in terrain rendering aIn this thesis, we propose an efficient hardware-friendly framework-Chunked LOD, for large-scale terrain real-time rendering .Within this framework, the approach for integrating multi-resolution representations of terrain geometry and terrain texture data is presented. In our framework, the multi-resolution models for terrain texture data and geometry data are matched with each other to achieve the goal of real time rendering.In Chapter 1, we introduce some backgrounds and application domains of the real-time terrain rendering. Meanwhile, we summarize some typical methods in recent publications, and enumerate and discuss the research works about terrain rendering in recent years.In Chapter 2, we discuss the terrain modeling with continuous level of detail, described a data layout technique for manage out-of-core datasets.Then, we investigate the OpenGL based NV extension for fully taking advantage of the accelerating function of graphic hardware and improving the capability of rendering. At last, we present an efficient hardware-friendly framework-Chunked LOD for large-scale terrain real-time rendering.In Chapter 3, we described the implementation of the Chunked LOD-an efficient, hard ware-friendly framework for large-scale terrain real-time visualization. And the future trends in real-time terrain rendering are disscussed.