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My question is as follows. I have x,y motion. normally I would ignore directionality and just look at the spectral density of each by performing a FFT on it. For my current problem directionality is crucial. I would like to create a 3D spectrum, frequency, direction and spectral density. I presume I would convert from cartesian to polar coordinates and then convert to frequency domain. Is this the best method and any help on how to do this wold be great. My google skills cant seem to find anything. Thank you

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