Realistic Modeling And Rendering Of Ray Scattering Effect

Simulation of ray scattering effect 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 ray scattering effect under the conditions of rain and fog,point light source ray scattering effect in homogeneous and double-layer participating media and multi-spectrum ray scattering effect.In chapter one,we introduce the significance and development of the simulation of ray scattering effect. Then we present different kinds of modeling and rendering techniques for those ray scattering effects such as the modeling and rendering of cloud, water, point light source and so on. The main research works of this paper are present at last.Rain and fog scene is a normal phenomenon. In chapter two, we propose a model of skylight under rainy and foggy circumstances. Based on properties of particles in different rain intensity, we simulate different ray scattering effect with different time, luminous intensity, simplify the equation of ray scattering effect under the conditions of rain and fog and realize the realistic rain and fog scenes in real time.Ray scattering effect of point light source has been a hotspot. In chapter three, through analyzing the conventional equations of single scattering of point light source, we implement real-time rendering of scattering effect due to non-isotropic light source, achieving efficient renderings of ray scattering effect of point light source for real-time applications. We also propose a polynomial approximate method, render the light scattering effect in double-layer participating media in real-time.Multi-spectrum ray scattering effect can simulate different atmospheric optical phenomena. In chapter four, by studying cause of rainbow and sandstorm and property of scattering, we realize different rainbow effects after different rain intensity and ray scattering effect in sandstorm.At the end of the dissertation, the author sums up all research in this paper, and gives the direction of following research.