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I don't understand the equation37 in simulate ocean water by Jerry Tessendorf.The result is all complex number, how to be the slope.Even if I compute the magnitude of it,the result is just positive which is obvious wrong.As There must be some points whose slope is negative.Who can help me.Thank you.

http://www-evasion.imag.fr/Membres/Fabrice.Neyret/NaturalScenes/fluids/water/waves/fluids-nuages/waves/Jonathan/articlesCG/simulating-ocean-water-01.pdf

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    Equation 37 is inverse fourier transform and ik*h~(k,t) does not preserve the complex conjugation property.So the result of the inverse fourier transform is a complex.Am I wrong?2012-11-28
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    Check the magnitude of the imaginary parts of the inverse Fourier transform that you computed. If these are very small (order of machine error), they come from roundoff and can be ignored. That is, just proceed with the real parts.2012-11-28
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    Do you mean that they should be small?But I found that they are not small enough compare to the real part.2012-11-28

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