

clipka <ano### [at] anonymousorg> wrote:
> You'd need to provide a use case though, and one or more proposals for
> the scene description syntax, as I've never used FFT in the context of
> raytracing, so I have no bloody idea what it could be used for in POVRay ;)
I'll see what I can do.
As with many things, it's a tool that looks very useful, and something I'd like
to explore.
I had wanted to use it for "simple" signal processing  to extract the
fundamental frequencies of the data in the vibrating plate animation I did.
I'm sure that given the various transcendent, repeating, and other functions
that are used to generate various scene elements, that some clever person could
apply the Fourier transform and its inverse to do some wicked cool stuff that I
can't currently imagine or articulate. ;)
From some of my reading, it looks like it can be used for some formas of
antialiasing, image deconvolution (sharpening), simulating types of noise, water
surfaces, etc.
http://www.bugman123.com/Fractals/index.html
(CTRLF to search for 'fourier')
Frequency Filtered Random Noise  Mathematica 4.2, 9/5/04
http://www.bugman123.com/Physics/index.html#Caustics
"Water Caustics  Mathematica 4.2, POVRay 3.1, 4/22/06
This waterlike surface was generated in Mathematica using frequency filtered
random noise, and then it was raytraced in POVRay and water caustics were added
http://www.bialith.com/Research/BARclockblur.htm
http://www.deconvolve.net/index.html
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