In this paper

the four-interpolatory scheme is applied in simulating topography. In order to control the form of topography

the proper“control-parameters”are chosen. For the sake of getting variant ones

geometric texture-rendering methods are applied. In the mean- time

patches are really displayed in GL environment bymodifyingthe property of the material

the light and the lightmodel. The experimental results showthat the algorithm offers an efficientmeans for simulation of natural scene which effected by the surrounding

the trees

the climate and so on.