关键词: 投影网格法, Perlin噪声, B样条曲面

Abstract: A new modeling algorithm for realistic travelling Tai lake surface simulation in virtual environment is presented.With the introduction of Johanson’s projected grid algorithm which doesn’t use multi-resolutional LOD model and avoids the chapping problem，it transforms the grid mesh from view space to world space.To speed up the rendering frequency and avoid noise calculation for every lake mesh vertex，B-spline surface is introduced to construct lake surface.The Perlin noise is applied to the control point of the B-spline surface in order to control the water height field indirectly.So the water surface can be divided in high resolution without more noise calculation.The construction speed of B-spline surface is guaranteed by acceleration function of the graphic hardware.It turns out that this modeling algorithm can satisfy the requirements of real time simulation of realistic water surface on generic PC platform.

Key words: projected grid algorithm, Perlin noise, B-spline surface