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shading a wave and cylindrical coordinate system question


Farid

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hi,
i'm struggeling trying to understand what's writin in this article from surf's up siggraf papper about cylindrical coordinate system of the wave and the parameterization of the surface, if someone can point me somewhere please, it's sound simple but i don't get it, i understand that cylindrical coordinate system is a way to calculate point position in a circle environement and then convert it to regular coordinate system for uv but in this case they use it to separate the wave zone various parts during its life cycle by using an angle. here is the full article and thanks for your help.

 

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