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Phillips谱在不规则海浪实时绘制中使用广泛。分析Phillips谱的结构,并计算出Phillips谱的频率谱和方向分布函数。Phillips谱的频率谱与P-M谱接近,因此参考P-M谱计算Phillips谱的常数A,并对谱风速进行说明。除了使用Phillips谱,还尝试其它形式的谱。用P-M谱和cos(-2s)形式方向分布函数构造PM-cos2s谱,用JONSWAP谱和Poisson形式方向分布函数构造J-Po谱。用上述3种谱绘制海浪,并比较绘制结果。Phillips谱和PMcos2s谱绘制的海浪可体现风速的影响,J-Po谱绘制的海浪可以体现风速、风距的影响,3种谱绘制的帧率相同。由于J-Po谱能反映风速、风距的影响,且生成波在风向(-π,π]范围内,因此J-Po谱更适合于航海模拟器。
Phillips spectrum is widely used in real-time rendering of irregular waves. Analyze the structure of the Phillips spectrum and calculate the frequency spectrum and direction distribution function of the Phillips spectrum. The frequency spectrum of the Phillips spectrum is close to that of the P-M spectrum, so the constant A of the Phillips spectrum is calculated with reference to the P-M spectrum and the spectrum velocity is described. In addition to using Phillips spectrum, also try other forms of spectrum. The PM-cos2s spectra were constructed using the P-M and cos (-2s) orientation distribution functions, and the J-Po spectra were constructed using the JONSWAP and Poisson forms. Draw the waves using the above three spectra and compare the results. Phillips spectrum and PMcos2s spectrum can reflect the influence of wind speed. The waves drawn by J-Po spectrum can reflect the effects of wind speed and wind distance. The frame rates of the three kinds of spectrum are the same. Because J-Po spectrum can reflect the influence of wind speed and wind distance, and generates wave in the wind direction (-π, π), J-Po spectrum is more suitable for navigation simulator.