关键词: 迭代函数系统,   ,  树木模拟,   ,  沙丘模拟,   ,  图形学

Abstract:         Under the natural conditions，the shape of sand dunes is varied and the natural conditions of the sand dunes are very poor， and the vegetation on which they live depends is often on different states. The computer graphics and fractal geometry were used to simulate the growth of dune and vegetation. Through the function iteration system,it can achieve a single tree and forest of the morphological simulation,and also simulation the trees in the dune growth by bolding the branches. The color of trees is divided by the method of tracing the affine transformation points to achieve the color of trees changing with the season. Using computer graphics to draw flowers and the random function to replace some of the points on the trees for flowers，little flower of trees was simulated. Using the combination of different phases of the sine curve the dune is drawn and then the dune vegetation scene is simulated by combining with the trees. The external factors are used to simulate the natural shape of the dune windward slope under natural conditions. Finally,by increasing the density of dune and the number of trees to expand the area of trees the local forest scene simulation is generated.

Key words: Iterated function system,    , Tree simulation,    , Sand dune simulation,    , Graphics