关键词: 小麦叶片, 实测数据；NURBS曲面；控制点；节点矢量

Abstract: Crop three-dimensional visualization will provide image lifelike visual tools for crop growth dynamic prediction, cultivation management control and crop plant type design, so as to effectively promote the development of the virtual agriculture and information agriculture. Since morphological structure of wheat is complex and three-dimensional visualization of the leaf is not easy to express, wheat leaf three-dimensional visualization were realized based on measured data and NURBS surface modeling. Firstly, wheat morphological data (leaf length, leaf width, stem and leaf angle, leaf bending angle, stem diameter, etc.) were collected from the field experiment, and then wheat leaf main vein control point construction algorithm were established, and the coordinates of the leaf main vein control point were calculated. Secondly, all control point coordinates and node vectors were calculated, the wheat leaf and leaf sheath surface model were built. Finally, the wheat simulation model of different growth period can be built with OpenGL graphics library, and the wheat leaf twisting deformation was implemented. The results showed that the selected wheat morphological data were representative, the reconstructed wheat leaf model were close to the real model, and it was easy to realize the dynamic simulation of wheat growth process.

Key words: wheat leaf, measured data, NURBS surface, control point, node vector