树木几何结构快速建模的研究

为更准确地分析风雪灾害作用下树木的力学特性，研究了树干和树枝的结构特点，并利用Pro/E三维软件的族表和UDF库等模块，提出了一种树木几何模型参数化建模方法。在考虑了树木自相似和自仿射分形特点的基础上，建立了树干与树枝结构分层阶梯式模型的设计新思路。通过设置和修改长度、分枝角度等几何参数，实现了树木结构几何模型的快速生成和重建。 

Rapid parametric modeling of geometry structure for trees.

In order to analyze the mechanical properties of trees in the natural disasters, the characteristics of trunk and branch structures were studied in the paper. And a rapid method of parametric models was represented using family table and UDF library of Pro/E. On the base of taking into account of the fractal characteristics of trees, which include self similarity and self affine, the models of trunk and branches layered and stepped were constructed. Through setting and modifying parameters, such as length and angle of branch, the generating and reconstructing of geometrical models for tree structure were implemented rapidly. The results show that the method of parametric models is effective in establishing tree structure.