Realistic Modeling And Rendering Of Atmospheric Phenomena Based On Physical Principles

Physically based simulation of atmospheric phenomena has been a hotspot and one of the most difficult tasks in Compute Graphics. It has been found wide application in many domains such as computer animation, computer games, special effects of movie, culture, religion, battlefield simulation, landscaping, architecture, virtual reality, etc. We will study the simulation of two particular atmospheric phenomena, Emei Glory and the process of spacecraft's reentry through the aerosphere respectively.In Chapter One, we introduce the significance and development of the simulation of atmospheric phenomena and classify various kinds of atmospheric phenomena. Then we present different kinds of modeling and rendering techniques for those atmospheric phenomena such as the medeling and rendering of cloud, rainbow, halo, aurora, lighting and so on. The main research works of this paper are present at last.Emei Glory is a peculiar phenomenon, which has a significant impact on Chinese culture and religion. In Chapter Two a novel method of photorealistic simulation of Buddha Glory is proposed. To simulate the glory, we first calculate the spectral scatter intensity of glory rings using Mie scattering theory. We then present a new shadow model to determine the deformed shape of the head and body of "Buddha" within the glory ring. For rendering, we adapt the method of path scattering integral to generate the whole attenuated scene of Buddha Glory.In Chapter Three, we introduce the modeling and rendering of the reentry process of the spacecraft, based on the principle of Quantity Optics and Radiance of plasma. Finally, realistic images of the spacecraft with fantastic wake shape and color during its reentry through the aerosphere are drawn.At the end of the dissertation, the author sums up all research in this paper, and give the direction of following research.