Realistic Simulation Of Plant Based On Radiosity Method

With the development of computer graphics, virtual reality has become a very activefield and has been widely used by many fields such as agriculture, education, remote sensingetc. The fantastic visual effects of massive online games shows the reselts of the research.Among all directions of virtual reality, realistic simulation of plants is a hot direction and ispaid more attention by scholars.The research on realistic simulation of plants can be divided into two aspects: plantoutline simulation and rendering. L-system was promoted by Lindenmayer in1968and thenthe theory was combined with computer graphics, which become the theory basis for plantssimulation field. Radiosity is a kind of overall illumination model and is one of the mostclassic methods. This article aims to model plant outline using L-system theory and thenrender the whole scene with radiosity illumination model.L-system is a rewriting system in essence. Abstract the growing process of plant andinitial state by experience first and then perform limited iteration, we can get a string. Bygeometric interpreting the string, the topological structure of a plant can be created.Now, there are two ways to create a realistic graphic. They are radiosity illuminationmodel and ray tracing algorithm. The latter is widely used, but it is more suitable to simulatespecular reflection and hard to solve problems as repeated diffuse reflection and colordiosmose. Radiosity illumination can make up this disadvantage and generate more realisticgraphic. In addition radiosity illumination model is independent of the viewpoint and can beapplied into Scene roaming system. Because the faces in plants simulation scene are mostlydiffuse ones, radiosity illumination model is undoubtedly an ideal choice.The paper has done in-depth research on L-system and has realized the3-D simulationusing MFC in VC++6.0. The paper has also done a thorough research on global illuminationmodel and payed more attention to radiosity model and finally realizes it in simple scene.In summary, the paper first introduces the research background and status of the field. Inthe main part, the paper introduces ray tracing algorithm simply, explain radiosityillumination model in detail, and discuss the solution way of form factor and radiostyequation. The paper also introduces some other steps of radiosity illumination model andrealizes the model in simple scene. The other key of the paper is L-system. The classificationof L-system is introduced in brief. Then D0L system is realized and discussed in detail. In thelast part, the two parts above are combined and realized experimentally.To sum up, this paper has realized plant outline simulation with L-system and renderedthe whole scene using radiosity illumination model. Then the two parts are combined togetherand finally realize realistic plants simulation.