一种大规模草地的建模与实时绘制技术

Modeling and Real-time Rendering Technology of Large Scale Grassland

大规模草地的建模与实时绘制技术是三维场景可视化的重要组成部分,通过利用草丛模型构建草地,提出基于四叉树的草地模型表示方法,该模型表示方法能大幅度的降低草地模型的复杂度和数据量;同时,基于此模型,在实时绘制时以草丛为单位,利用两草丛间的距离在屏幕上的投影对草地模型进行动态简化,从而大幅度的减少所需绘制的多边形数量,提高草地的实时绘制速度。

The modeling and real-time rendering of large scale grassland is an important part of 3D landscape visualization. An expression method for grassland model was proposed by using grass tufts to create grassland, which could effectively reduce the complexities of grassland model. At the same time, a dynamic simplification method based on the expression was presented. This simplification method can improve the frame rate by. reducing a number of geometric primitives which were not necessary to be rendered during real-time rendering according to the screen projection of the distance between two grass tufts,