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Key technology research and implementation of a virtual scene -photorealistic rendering

Author: LiuFeiYang
Tutor: ChenLeiZuo
School: University of Electronic Science and Technology
Course: Applied Computer Technology
Keywords: realistic rendering illumination model texture mapping dynamic sky flat cloud 3D cloud
CLC: TP391.41
Type: Master's thesis
Year: 2011
Downloads: 46
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Abstract


With the rapid development of computer graphic hardware, software and relevant research field, computer graphics gained great progress in realistic rendering. Realistic rendering technology has been widely used in CAD, virtual reality, animation, movie effect, computer games and has played an important role in social and economic development. The reality of virtual scene and real-time rendering are the key factors which bring user sense of immersion. It is getting more attention as how to enhance the reality of virtual scene. Researches are carried out on many aspects such as reality of illumination, reality of objects’surface, reality of natural scenery, and a series of virtual scene realistic rendering technologies are proposed.The illumination model always takes the very important position in these key technologies. It serves as the foundation of realistic virtual scene generation. In this thesis local illumination model is mainly studied, classic local illumination model is introduced and its shortage is analyzed. Based on that, a more complete local illumination model is discussed and implemented. At last, global illumination model and ray tracing algorithm are studied.In order to simulate the complicate details of objects’surface and increase the reality of objects’surface, some basic concepts and principles related to texture and texture mapping are elaborated. The thesis focuses on researching bump mapping which is used to simulate bumps on objects. A method which could pre-generate optimized normal map using sobel filter through processing the gray map of regular color texture is presented. And the DOT3 bump mapping based on optimized normal map is implemented using shader programming.Moreover, the real-time realistic simulation technologies of dynamic sky as well as all kinds of sky elements it contains are thoroughly studied. Both the methods to calculate the positions of sun, moon and to render them on the sky with right color and phase according to time changing are proposed. According to atmosphere scattering theory, the thesis discusses the color characteristics of the sky during different times, simulates the Raylaigh Scattering effect during different times in a day by sampling a color gradient map and proposes a simplified exponential fomula to approximate Mie Scattering effect. The thesis also implements a realistic cloud system which includes flat clouds using Perlin noise and 3D clouds using Cellular Automaton and volume texture.At last, based on previous works, these key technologies are applied into project, a dynamic sky subsystem, some realistic illumination and bump material scripts are designed, implemented and then integrated into JinSha 3D virtual exhibition system. The simulation results and performance are analyzed as well.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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