Realistic Simulation And Visualization Of Interaction Between Rice Leaves And Spraying Based On Physics Laws

In recent years,with the development of computer technology,especially the concept of digital agriculture,research of crops combining virtual models and physical laws in virtual scene has become a new method of agricultural research.Using the computer visualization simulation method,the virtual fog field is reproduced in the virtual scene,and the physical laws are used to simulate the interaction between the droplets and the leaves,so the deposition of the droplets on the rice leaves can be effectively and quickly calculated.Rice is one of the most widely cultivated crops in China and pesticide spray is the main mean to combat the diseases and insect pests of rice.However,the use of pesticide in China still faces the problems such as low effective deposition rate,serious waste of pesticide and great damage to the environment.The differences in the shape and surface characteristics of different rice varieties,the differences in the droplet size,the spray angle and the flow rate of different spray equipment,and the differences in the deposition effect of the droplets at different height of the rice,all affect the pesticide spray.At present,most studies on rice spray are based on field experiments,although they can accurately obtain the influence of the related parameters of rice plants and sprayers,the field test is not only time-consuming and energy-consuming,but also requires higher environmental conditions.Based on the physical laws of fluid motion and computer graphics technology,the interactions between droplets and rice leaves in virtual scene are studied in this paper.The main works is given as follows:1.The depositions of droplets on rice leaves with different inclination angles are simulated based on the contact angle test.The spray system is simulated using particle system,and it is more realistic and efficient to simulate the spray scene of rice.2.A method to determine the rebound and shatter of droplets in the virtual scene is improved.Compared with the previous work,in the study of the droplet rebound,we combine the droplet rebound with the surface characteristics of rice,analyze the judgement condition for the rebound of the droplets,simulate the movement after rebounding,and improve the determination method of the droplet rebound.The characteristic of rice fuzz is added to determine droplet rebounding.In the field of droplet shatter,a method to determine the thresholds of shattering is proposed by measuring the contact angles of the droplets on the leaves of rice.Finally,the visual simulation of interaction between fog and leaves is realized on Unity3 D platform.3.A statistical method of rice leaf deposition based on virtual spray scene is proposed.This method combines the fog field model and the rebound model which have been constructed,and considers the deformation of the rice leaves by the effect of fog field.At the same time,a calculation method of maximum droplet deposition on the rice leaves is proposed.Finally,the method is tested,and it has certain effectiveness.This method has a certain significance for the study of rice spray deposition.