Constructing Coupling Model of Generalized B-Spline Curve and Crown (CMGBCC) to Explore the 3D Modeling of Chinese Fir Polymorphism

Crown simulation based on basis spline (b-spline) interpolation is a compatible method to simulate tree polymorphism at present. However, there are two problems when it simulates the crown: first problem that derivative value top point needs be given manually, and second type of collected equidistantly. To solve above realize convenient accurate simulation, this study took Chinese fir as object, set crown morphological feature model point, constructed coupling generalized B-spline curve (CMGBCC) constraint condition shape in process three-dimensional (3D) model. The position size distribution 3D branches were constrained by curve, modeling was constructed. According collection fir-type points sample plot, realized detailed types points’ precise for three polymorphisms crown, including natural pruning, displacement, difference. At same time, different withered existence states considered preliminarily. Compared with field survey data, indicating models could difference morphology precisely, branch separated convenience growth. In construction, CMGBCC did not need add manual way collect according characteristics changes completely. results constructed, which (GB-spline) b-spline interpolation, showed number GB-spline decreased 18% average. precision improved 7.63% compared interpolation. combined relationship between environment. behavior forest management measures, such pruning.