The Construction And Design Of 3D Tree Model Management System

With the development and improvement of the forest 3D visualization technology and database technology, the process of forestry information construction in our country is moving forward.3D tree model construction and 3D tree database design as a foundation of tree visualization process, forestry information construction plays a decisive role in forestry information construction, whitch is the core to achieve 3D forest great scene. Trees in the process of growth may be affected by many factors, result in a wide variety of shapes and complex structure, so three-dimensional visualization simulation has higher difficulty and challenge and it is hard to reconstruct tree model quickly. On the other hand, because of every tree has its own unique morphological structure, there are no trees with the same structure, resulting in a huge amount of data, which is a serious challenge for the management of the forest tree model.The study begining with reconstruct 3D tree model, with ractal theory and tree morphology as the basis, realize quickly construct 3D tree model by adjustment of structure parameters of trees and branches. In the process of reconstruct 3D tree, in order to reduce the number of trees triangulation, we abstract branch element model. With the branch element model based, using the improved fractal iteration algorithm and random function, realized tree branches bending. When drawing the tree leaf model, we are using the quadrilateral as leaf shape and the texture information is described in the form of texture mapping,so that we can makes the trees have a high sense of reality. Using Visual C# to draw the form interface, combine with C++and DirectX on the 3D model tree construction, to obtaine 3D trees model generation system.With Sever SQL 2008 database as platform, the model configuration table, model branching structure table, tree 3D model and texture mapping in the form of binary flow were written to the database, to build a three-dimensional tree model library. The tree 3D model, the texture map, the shape structure table and the branch structure table are related to each other, which form an integral whole. For the convenience of users to preview model information in the database,with the tree attributes as model classification standard, using the treeview form for users to preview model informations. In order to facilitate the management of model base, the system has been added to modify and delete module,it also added model retrieval and model call interface, which provide the basis for the rapid retrieval and call of forest tree.Three-dimensional model of forest management system for forestry scientific research has a great application value, which can provide researchers forestry significance three-dimensional trees model and convenient three-dimensional database management, to lay a solid foundation for the construction of digital forestry.