Peter Popov wrote:
> 
> I have heard of moire pattern analysis being used in vibrational
> dynamics but can't say anything for sure.

Strange. If so, I wonder how it is applied.


> 17 years ago I was probably spending most of my days sitting on my
> bottom, building castles from wooden blocks.

:-)


> >Back then I did some experimenting with Lissajous
> >curves in 2D, and sometimes when plotting those,
> >nice Moire patterns appeared.
> 
> Yes, Lissajous... these were the other major fun factor back then. Of
> course I did not know what sine and cosine meant but at least I could
> tweak and tweak and tweak :)

My problem was that I didn't know back then that it 
was called Lissajous curves. 

I knew the meaning of cosine and sine.
But I too had to do a lot of tweaking 
to get the nice patterns !


> What is a moire pattern? The overlapping of two similar grids. Make a
> grid (for example, create a pattern and fill the canvas with it),
> distort it a little bit and mix it with the original. In order to make
> the pattern cyclic, the distortion should be cyclic as well. The wave
> distortion works well, just make sure that the wavelenghts are
> divisible of the image dimensions and the edge pixels wrap around. The
> mixing can be done as 'multiply', 'hard light' or virtually any other
> mixing type. It gets even better if this is done for the r, g and b
> channels separately.

I see. Thank you for explaining !

I have access to Photoshop, but I haven't 
worked much with it yet.


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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