苹果花序几何造型及可视化研究

Geometry Modelling and Visualization of the Apple Inflorescence

重构出植物的三维形态是数字植物研究的重要内容之一。为了实现对苹果花及花序三维形态结构的交互设计、几何建模和真实感显示,提出了精确描述苹果花序三维形态结构的数学模型及可视化方法。通过对苹果花及花序形态结构的观测分析,分别提出了描述花柄、花托、花萼、花瓣、雄蕊和雌蕊三维形态结构的数学模型,并提取了模型的控制参数;进一步整合苹果花及花序的拓扑结构信息,实现了苹果花及花序的三维重建。为了增强花的真实感,提出了花柄、花托和花萼上绒毛的生成方法。结果表明,该方法可控性强,易于操作,可以精确重构出苹果花和花序的三维形态,并可实现开花过程的可视化模拟,具有较强的真实感。

The reconstruction of 3D shape of plant is one of important issues in digital plant. Mathematical models and visualized methods have been proposed in this paper for describing accurately the three-dimensional morphology of apple inflorescence. These models and methods are desired to realize the interactive designing, geometric modeling and realistic rendering of the 3D structure of apple flower and its inflorescence. Firstly, mathematical models for describing the 3D structure of anthocaulus, receptacle, calyx, petal, androecium and pistil are proposed basing on observing and analyzing the 3D structure of apple flower and inflorescence. At the same time, parameters for controlling these models are extracted. Secondly, the reconstruction of 3D structure of apple flower and inflorescence is implemented by integrating its topological structure information. Further, methods are proposed for generating fine hairs covering on anthocaulus, receptacle and calyx, this can enhance the realism of the generated flower models. The results demonstrate that the proposed method can reconstruct precisely the 3D structure of apple flower and inflorescence, and simulate visually the flowering process with realistic effects.