Study On Key Technology Of Virtual Plant Visualization

Plant development is a dynamic process in which the topology and geometry change over time in a seemingly complex manner. We can simulate the developing process in the three-dimensional space on computer to reflect the morphological structure changing of the realistic scene, including the individual plant and the community. The study on visual techniques of the virtual plant is a main part of the researches of the virtual agriculture, which has potential applications ranging from computer-assisted landscape, education, games, and virtual garden to digital agriculture such as the study and management of plant diseases and plant bleeding as well. The paper includes:First, the paper studies the existing research status of virtual plant growth and its issues, and analyses the techniques of virtual plant organs'building. Then it makes a conclusion of the above researches, it contains the simulation of the plant physiology and zoology and visualization.Then, it analyzes the basic concepts of plant and variety of topological models of plant, then it provides the theory of the virtual plant modeling. The dissertation emphasis on the principle of the L-system and propose a method that based on the the library of the plant organs and further use L-system to"reorganize"the growth of plants.Thirdly, it studies two plant organ modeling techniques and gives the advantage and disadvantage of them. The paper presents a new method which models the plant elementary organs (like stem, petal, calyx, leaf et al.) by the outside modeling software and choose the L-system to simulate the plant development. It brings forward a modeling technique based on the characteristic of the plant organ to model the components of the plant, and to use the different density of the meshes on the different organs, it also use the mesh subdivision way to add the abundant mesh vertexes and faces. Then it also adopts the two-part texture mapping to increase the visual effect.To simulate the whole growth status, the paper chooses the L-system to simulate the plant development. According to this formalism, a plant is viewed as a developing assembly of individual units, or modules. These modules are characterized by parameters such as length, width, and age, as well as parameters characterizing shape. It uses a three-dimension model converter to import the plant organs designed by the outside modeling software to the L-system to control the plant growing.The experiment result shows this methodology can effectively solve the problem of lacking of the detail on the plant surface in real time and combine the physiology of plant seamlessly.