Visual Simulation Research On Branching Structure Of Cunninghamia Lanceolata

Trees virtual reality technology is the important research subject of forestry and computer experts and scholars at home and abroad. Along with the development of virtual plant research and further, plants simulation already beyond visual simulation on lifelike, began get more attention plant itself inner growth rule and morphological structure. The study simulates the Chinese fir in the 3d visualization system using IFS fraction algorithm and the analysis results of branching structure.First of all, analyzed branching structure of Chinese fir according to related knowledge of plant building type; and ascertain the structural parameters of Chinese fir form the overall data for trees and branch angle (elevation, azimuth), branches length, rooted branches diameter, height to the father branch base, etc, a series of factors branch number. Using the survey method by branch of Huangfengqiao national Forest Farm data investigation and analysis, obtained the first and second branch of Chinese fir the elevation, azimuth distribution interval and law; established index of the branch root diameter and branches long; determine the scope and the bifurcation ratio increased with age; last, integrated these structural features as the entrance parameters for 3d visualization simulation.Second, the tree crown growth defined as crown base diameter, height to crown base, height to crown was controlled by the tree growth model. The boundary constraint was directed by IFS fractal iterative so that the growth of the inter branches are controlled. The simulation of the tree branching structure was accomplished based on the tree crown model and the tree growth model.Finally, using c # programming language and object-oriented method, the trees branching structure 3d visualization sub-system was developed based on DirectX platform. The Chinese fir branching structure was visualized by the component simulating technique in the system platform through the branching structure parameters and the texture information that is determined and selected by the paper.