Three-Dimensional Modeling of Trees Group with Spatial Characteristics and Its Space Subdivision Method

Modeling of trees group is one of the key issues of building virtual forest environment. A new model of trees group with spatial characteristics is proposed. The model focusing on describing the spatial structure of tree populations and their topology relations, takes into account the overall distribution of trees group. In the process of modeling, TIN is used to interconnect roots of adjacent trees so as to form Delaunay triangulation networks. Rule-based method is used to establish single tree model with data from the sample plots. Compact octree is used to divide up the model so as to effectively simulate and analyze trees environment in three dimensions. Finally the tree model and modeling method are realized by Visual C++ and OpenGL. The modeling method is tested by measurement data.