Hi Chris,
J-S pretty much covered everything in his reply. I did a fair bit of
research into FFT libraries (the free ones) and found that a lot of them
didn't support 2D transforms out of the box or they were very poorly
documented. Due to time restraints I had to choose the one that was
easiest to implement. FFTSS could be dropped in with very little work
and was also very straight forward to compile on both linux and windows
so I went with that.
If you're interested in the timing differences between FFTSS and FFTW I
found that FFTSS took approximately twice as long to compute 1000 64x64
complex to complex FFTs. My tests were fairly rudimentary though. I
believe J-S found less of a difference when he tested the timings on his
machine.
Regards,
Kim.
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Chris
'Xenon' Hanson
Sent: 16 June 2009 02:16
To: OpenSceneGraph Users
Subject: Re: [osg-users] osgOcean 1.0 (LGPL) Released
Kim C Bale wrote:
> Hi all,
> - FFT ocean simulation model and rendering
> - Choice of FFT library dependancy
> Possibly the most important change is that the library is now held
under
> a LGPL license.
> The CMake build now offers the choice between FFTW (GPL) or FFTSS
(LGPL)
> for the FFT library dependancy which resolves the license issue. FFTW
is
> the faster option, but the differance if fairly negliable within the
> context that it's used.
I curious if you evaluated the (very free) DJBFFT library and if so,
if you found it
insufficient. I know someone else who is evaluating FFT libraries and
just wanted your
input if you had already tried it out and found it lacking.
--
Chris 'Xenon' Hanson, omo sanza lettere Xenon
AlphaPixel.com
PixelSense Landsat processing now available!
http://www.alphapixel.com/demos/
"There is no Truth. There is only Perception. To Perceive is to Exist."
- Xen
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