Abstract:

【Objective】 The aim of the study was to develop an architectural parameter-based geometrical model and realize the visualization of panicle in rice. 【Method】 Based on measuring and analysing morphological structure of rice panicle, an architectural parameter-based geometrical model for rice panicle was developed by using 3D geometric modeling technology. The model included 4 submodels: panicle axis curve, panicle axis geometry, primary and secondary branch geometry, and spikelet geometry submodels. Bezier curves were used to simulate dynamics of the panicle axis curve, panicle axis geometry submodel was developed by mapping panicle axis curve to 3D, primary and secondary branch geometry submodel was developed with a part of panicle axis and a cylinder, spikelet geometry submodel was developed by a ellipsoid and a cylinder. Based on topographic structure of rice panicle, the rice panicle geometrical model was developed. The main parameters of the model were the length of panicle, the angle of panicle-neck, the length and number of primary and secondary branches, the grain size and so on. 【Result】 Based on the geometrical model for rice panicle and the platform of OpenGL, the dynamic growth processes of three-dimensional morphological structure of rice panicle was realized on the computer. 【Conclusion】 Rice panicle visualization could lay a foundation for development of visual growth system in rice and be used for reference to the visualization of other crops.

Key words: rice, panicle, geometry modeling, visualization