基于实测数据和NURBS曲面的小麦叶片三维可视化

小麦三维可视化在农业生产、作物生长预测等领域具有重要应用价值,将为作物株型选育,高产、高效栽培等提供有力技术支撑。针对小麦叶片三维形态不易模拟的问题,基于田间试验实测数据和NURBS自由曲面造型技术,构建小麦叶片主脉控制点构造算法,计算小麦叶片NURBS曲面控制点坐标,并借助OpenGL图形库实现了不同控制点序列下的小麦叶片曲面模拟。试验结果表明,该方法计算效率较高,绘制的小麦叶片模型具有较高平滑度和真实感。

3-D Visualization of Wheat Leaves Using Measured Data and NURBS Surface

3-D visualizationis valuable for forecasting wheat production, as well as the breeding, yield, and cultivation of the crop. However, developing the technique to virtually simulate wheat leaves faced difficult challenges in the past.This study attempted to overcome the obstacle by applying selected measurements on the leaves to feed in the Non-uniform rational Basis spline (NURBS)mathematic model for a 3-D graphic representation of the leaves.Firstly,the algorithm for control points of the main veins on a wheat leaf was established.Secondly, the coordinates for the NURBS surface control points were calculated.And,finally,a simulation model under different control point sequence was constructed with the aid of open Graphics Library (OpenGL).The resulting algorithm was found to be highly efficient,and the simulated image sexceedingly smooth and realistic.