Abstract: The method of morphological modeling of maize leaf based on Non-Uniform Rational B-Splines (NURBS) interpolation combining with multi-line segment splitting algorithms and controllable mesh simplification of triangular surface was introduced. A group of three-dimensional data points used from a scanning device, the crop leaf crooked surface with third-dimension effect was constructed stepped by vector calculation, crooked surface control points resulted by interpolation calculation and etc. According to leaf morphological characteristic, leaf surface mesh amount was simplified by inverse operation of multi-line segment splitting algorithm, and mesh amount declined with available maintenance of surface characteristics. This method was used to calculate visualization and light distribution and the result showed that calculation effect could be improved clearly when calculation error was not increased remarkable. The method could reflect model details and provided the solution to harmonize the relation between visual effect and calculation efficiency of crop morphological model.

Key words: maize leaf, NURBS, morphological modeling, mesh simplification, light distribution calculation