Simulation Of Natural Cloud On Cellular Automaton

Over the past decade, one of the important fields in the study of Computer Graphics is the imitation of natural phenomenon, rendering of natural scene is a hot topic in the research area of graphics. How to construct complex structures, and morphological changes of the object is a new topic in computer graphics with the imitation of clouds as its hot topic. The traditional set of modeling methods can not effectively describe shapes of the clouds that have no rules, and can dynamic changes. In this paper we bases on cellular automata model and the description of clouds-like objects in hydrodynamics to further study the cloud modeling, dynamic simulation, and the illumination model. The following aspects are studied in this paper:1. model of clouds on the basis of cellular automation.The cellular automation is simple and high efficient. The application of cellular automation to the setting of clouds model can basically increase the speed. This paper proposed state transition rules of clouds, based on cellular automata. The rules base on the characteristics of cloud changes in the real world, and control the speed of the formation of clouds, so the model can meet the natural cloud's state transition laws.2. Combine with Mathematics Physics Equation to realize the natural cloud.After studying the fluid mechanics, which describes cloud-like objects that has no rules, we extracted some natural factors that affect the movement of clouds and their affecting ways. We proposed the cloud simulation method of using of cellular automaton model to stimulate the dynamic phenomena of the cloud. This method can be combined with the natural physics of cloud movement and the using of cellular automata rules helps to improve simulation realism. In the real world, cloud height will affect the size of the wind which will affect the passive movement of the clouds; and the external environment such as the concentration, temperature and convection-diffusion, will bring about internal disturbances. These changes have been studied in mathematical physics equations. This paper uses the equations of mathematical physics to build state transition rules based on cellular automata. So the dynamic simulation of the cloud is real and speedy.3. A deep study on the illumination rendering of natural clouds. In nature, light propagation will reflect, refract, diffract, scatter in the medium and it is the same when it's in the cloud. The cloud is made up of small particles, and all particles receive light and they reflect, scatter. These phenomena will have mutual influences, and further affect the strength of their received light. So the spread of light in the clouds is a complex and iterative process. There are multiple scattering theories and single scattering theories in the process of light propagation. This paper further simplifies the process of light propagation without losing the authenticity. We mainly uses the multiple forward scattering and single scattering to render the light. In the process of the light propagates to clouds, we uses the multiple scattering models, which showed various communication paths, and because of the light was weakened and ignored, this model can improve the speed; and when we calculates the light transmits from the clouds to view, we use the one-way technology, which can meet authenticity and speed.This paper uses cellular automata model and various physical properties of clouds, to achieve a dynamic, and realistic simulation of natural cloud, which is real and speedy.