Abstract: Visually simulating the geometrical shape of rice panicle is a key step to build virtual rice growth model, which can help us to better understand crop growth process. Because of its complex shape, it is quite difficult to vividly model threedimensional architecture of rice panicle. To address this issue, a new visually modeling algorithm for rice panicle structure was proposed based on bending deformation model in mechanics of material and threedimensional form of rice panicle was visually simulated. First of all, the threedimensional morphological data and the weight of rice panicle at different growth stages were measured through field experiments. And then, according to the type of rachis branches and different distributions of gravity, the curved patterns of panicle axis and various types of rachis branch were simulated with the improved model of the bending deformation and the space coordinates. Finally, the whole threedimensional shape and the growth process of rice panicle were simulated successfully in accordance with its growth laws. The experimental results show that this algorithm provides an approach to realistically modeling the threedimensional architecture of rice panicle under natural conditions.

Key words: rice, panicle, bending deformation model, visualization, modeling

摘要： 通过实验测量了不同生长阶段水稻穗的三维形态数据和粒重，根据穗轴及各类型枝梗重力分配情况的不同，结合改进后的弯曲变形模型和空间坐标系，模拟了水稻穗的穗轴以及各类型枝梗的弯曲形态，提出了一种新的基于材料力学弯曲变形计算的水稻穗模拟算法，实现了对水稻穗几何形态的模拟。在此基础上，根据其生长规律模拟了整个水稻穗的几何形态及其生长过程。实验表明，使用该方法能较真实地模拟自然条件下水稻穗的几何形态。

关键词: 水稻, 穗, 弯曲变形模型, 可视化