Research On The Natural Phenomena Simulation In Virtual Environment

The technology of natural phenomena simulation is a challenging problem in computer graphics. The people in many fields, such as aviation and spaceflight, movie, TV, advertisement, the design of outside and virtual train, show great concern about the development of this subject. However, there are some difficult issues in the process of research. Since the geometry configuration of natural phenomena is complex and the movement disciplinarian of it is abnormal, and it is too difficult to describe in the way of traditional Euclid Geometry. Snow, rain and cloud are three kinds of natural phenomena which can be seen anywhere in daily life, it is necessary in virtual environment. The simulation of three kinds of typical natural phenomena is studied in this paper.This paper first analyzes the characteristic of natural phenomena, the complexity of natural phenomena simulation which is decided by the characteristic of natural phenomena and talks about some common used methods of natural phenomena simulation. Particle system theory is further studied in this paper, with the characteristic of snowing; based on particle system model, the process of snowing is simulated. The method of applying pulverization to virtual environment is proposed to solve the problem of the blur of snowing environment and firn phenomena.Based on the snow particle model, with the characteristic of raining and the air dynamics, the process of raining is simulated in this paper. Water wave phenomena which is the rain drops into the water is studied, eight points water wave linear simulation arithmetic which is suit for real-time rending virtual environment is proposed by improving four points water wave arithmetic.This paper designs and realizes the volume cloud simulation arithmetic which is based on Perlin noise, and realized the simulation of cirrus, cumulus and stratus. Perlin noise is short of simulating cloud physical sports, so based on the CA theory cloud dynamic simulation arithmetic is designed and applied, the formation, extinction and movement of the blowing winds of cloud are realized, and extinction probability variables are introduced into the process of cloud extinction to solve the problem of cloud slow extinction and formation after extinction.