虚拟树木形态结构的交互式编辑技术及其实现

为解决传统田间管理中树木剪枝操作不可逆的问题，该研究提出了一种虚拟树木形态结构交互式编辑方法。首先采用参数化方法开展树木形态结构三维建模；然后基于后缓冲区技术提出一种结合树木层级拓扑结构的枝干交互式拾取方法，并利用OpenGL（Open Graphics Library）渲染技术实现整枝删除、枝段修剪、枝干长度或半径调整等交互式编辑功能。最后，以园林绿化树木中常见的特殊冠型为约束模型，快速、直观地模拟树木树冠综合整形过程。该技术不仅扩展了参数化单株植物建模系统的功能，还为树木栽培与养护管理中修型整枝或株型设计提供了一个数字化、可视化、智能化的新手段。

Interactive editing technique and its implementation for virtual tree structure

An interactive virtual tree structure editing method is proposed to address the irreversible tree pruning process challenge in the field management. Parametric 3D tree model was built, and interactive stem picking method based on Back-Buffer is proposed by integrating the tree hierarchical topology. OpenGL rendering technique was used to implement interactive stem editing functions, such as branches pruning, shoot sections pruning, branch length or radius adjustment. Using the canopy type found in common ornamental and afforestation trees as the constraint mode, comprehensive 3D tree morphing can be achieved rapidly and intuitively. This method not only improves the parameter-based 3D tree modeling system, but also provides a digital, visual, intelligent way to plant type design and pruning for virtual tree planting and management.