Very neat! I'm hydrodynamics by background and I wondered a long time ago why this kind of approach was not used as I always found ocean waves to look awful in movies. Once you describe ocean sea state in frequency domain, it is quite easy to give to floating objects like ships realistic motions using what we called RAO in this field (linear operator). You can also model sea disturbance (diffracted and radiated waves) caused by an object in a similar fashion.
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