Here's an example of using a Fourier transform to remove moiré patterns: http://www.reindeergraphics.com/tutorial/part04.html
You can think of the Fourier transform as just a different way of looking at your data that makes some operations easier. It's similar to, e.g., using polar coordinates to make it easier to paint out seams in panoramas. gray From: [email protected] [mailto:[email protected]] On Behalf Of Jens Lindgren Sent: Monday, April 29, 2013 02:05 AM To: [email protected] Subject: Re: FFT ICE node My first project with Amaans FFT nodes is going to be boat wakes: http://upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Fjord.surface.wave.boat.jpeg/1024px-Fjord.surface.wave.boat.jpeg I was planning to develop it during the weekend but I didn't have time, but I will start on it today. /Jens On Mon, Apr 29, 2013 at 12:24 AM, Andy Moorer <[email protected]<mailto:[email protected]>> wrote: I got this book at siggraph, it's now in digital form. http://www.dspguide.com/ch24/6.htm Very helpful and idea-provoking. :) On Apr 28, 2013, at 12:34 PM, Amaan Akram <[email protected]<mailto:[email protected]>> wrote: Some practical applications Jos Stam's classic fluid dynamics paper that uses fourier transforms http://www.dgp.toronto.edu/people/stam/reality/Research/pdf/jgt01.pdf FFTs applied to images http://www.cs.unm.edu/~brayer/vision/fourier.html People create noise textures in FFTs, or analyze noise via FFTs There's also the classic spectrum visualization that is also dependent on FFTs Jens Lindgren has a very interesting application of FFTs too. Jens? The classic 'low-cut' or high-pass filters in photoshop are also applications of ffts On 28 April 2013 15:59, olivier jeannel <[email protected]<mailto:[email protected]>> wrote: Helps a bit, thank's ;) Le 28/04/2013 14:47, Eric Turman a écrit : The internet is full of information...but its not always comprehensible. For example: wikipedia brings up as nearly a technical explanation (in a concise form ;P ) as the fftw.org<http://fftw.org> FFT is used with periodic waveform interaction to tease out values --decompose into sine components. (I hope that I'm not mangling the meaning by trying to cram it down into one sentence) This link does a better job at explaining it: http://www.earlevel.com/main/2002/08/31/a-gentle-introduction-to-the-fft/ There are so many uses for FFT. It is a valuable (arguably critical) tool for all sorts of signal processing ranging from noise filtering to 3D tracking. But perhaps a more immediate and practical application of it in the 3D world is its facilitation of the deformation calculation of Amaan's aaocean polygonal surface http://www.amaanakram.com/?page_id=131 I hope this helps :) Cheers, -=Eric -- 3D Artist/TD @ The Mill, London http://www.amaanakram.com -- Jens Lindgren -------------------------- Lead Technical Director Magoo 3D Studios<http://www.magoo3dstudios.com/>
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