关键词: 快速傅立叶变换, 几何着色器, 实时, 草叶

Abstract: Wide range natural environment has become the indispensable factor of 3D games and simulation systems. Vegetation is an essential element of the natural environment. It helps to improve the immersion of simulation scenarios. Accurate rendering of the geometry based grass often resorts to drawing a large number of patches. The computational complexity is significantly increased when the number of the geometric patches be increased. When the grass blade is moved by the wind, the geometry model of the grass must be dynamically changed. It will undoubtedly make the real-time rendering difficult. The dynamically created primitive strip by the GeometryShader and image-based rendering method are effective methods to decrease the magnitude of the geometric patches. The dynamically created primitive strip by the GeometryShader,image-based rendering method and the FFT-based flow control method make the real-time rendering dynamic grass blade possible.

Key words: Fast Fourier Transform (FFT), geometry shader, real-time, grass