航海模拟器视景系统中的混合浪绘制

摘要

使用快速傅里叶逆变换(IFFT)Gerstner波模型描述海浪运动,在航海模拟器视景系统中实现了混合浪实时绘制.利用六参数谱构造混合浪的波数谱,将该波数谱应用于海面高程和choppy波的傅里叶系数中,通过IFFT获得海面质点的位置,实现混合浪的实时绘制.绘制的混合浪受低频长峰波影响,波形较为平坦光滑,与绘制的风浪有一定的差别,但与真实的海浪更为接近.该方法在航海模拟器视景系统中的使用,表明帧率可以达到实时.%Mixed wave is real-time rendered in the visual system of maritime simulator. Inverse fast Fourier transform (IFFT) Gerstner wave model is used to compute the motion of ocean wave. Six parameter spectrum, a frequency spectrum showing energy distribution of mixed wave, is applied to construct the wave number spectrum of mixed wave. The wave number spectrum is contained by the Fourier coefficients of height field and choppy wave. By IFFT, the position of mixed wave surface is gotten. Further, mixed wave is rendered. The rendered mixed wave is affected by the low frequency wave with long wave length. Its shape is smooth and flat, differs from that of wind wave, but is similar with the actual ocean wave. The presented method of mixed wave rendering is used in the visual system of the maritime simulator, and the frame rate meets the request of real-time rendering.