Re: Seed 514 in feTurbulence causes squares

14783, 14862, 14921, 18607, 19537, 19852, and 19955 cause it too. Thirteen found bad seeds should been enough, right?

--- In [email protected], "Ryan Richards" <everetthigh@...> wrote:
>
> I make game cards ( http://アニメイヘム.com/ ) and use the card's ID number at the seed. Up to about 1800 so far. I was just looking through them one day and saw number 514. I thought it might have been something to do with the JPEG transcoding of the SVG so I redid it. It wouldn't go away. I submitted a bug report to Batik and nothing happened, so I gave up on it. After success in reporting a different bug in Firefox I thought I'd give this one a try. I did test 0 - 9999, and transcoded to PNG. Sorting by file size yielded the culprits. Checking the next 10,000 today. ASV is affected. Thanks for the response.
> 
> --- In [email protected], "David Dailey" <ddailey@> wrote:
> >
> > Wow! That is very odd.  Firefox and Chrome show the squares in the same
> > locations.
> > 
> >  
> > 
> > Opera, which, along with IE/ASV, for years has had the most stable and
> > complete implementation of filters, does not show the oddity, making me
> > think it is an implementation problem.  The last time I looked at Perlin
> > noise (e.g., [1]), I didn't see anything that should cause those
> > discontinuities.
> > 
> >  
> > 
> > Safari doesn't seem to like SVG, as a general principle and, like IE9 shows
> > a black rectangle. I haven't been able to test in ASV yet.
> > 
> >  
> > 
> > That FF and Chrome and Inkscape would all behave the same way, suggest that
> > they all just plugged in the same slightly flawed chunk of underlying source
> > code. I would suggest submitting a bug report to Firefox and see what those
> > folks think about the issue.
> > 
> >  
> > 
> > Interestingly, it happens at all values of numOctaves.
> > 
> >  
> > 
> > How did you find these funny numbers:  514, 1977, 2337, 4777, 8032, 9615 ?
> > (They are not a sequence in the Encyclopedia of sequences [2] - I tried just
> > on a whim.) Did you really try all 10,000 values of seed? A lot of times
> > with things involving seeds, there is also a modulus, m, and if Euler's
> > totient function of the seed and the modulus is other than m-1, then you get
> > funky holes in the periodicity, but, from my experience, those holes are
> > usually more numerous.
> > 
> >  
> > 
> > Cheers
> > 
> > David
> > 
> >  
> > 
> > [1]
> > http://webstaff.itn.liu.se/~stegu/TNM022-2005/perlinnoiselinks/perlin-noise-
> > math-faq.html 
> > 
> > [2] http://oeis.org/ 
> > 
> >  
> > 
> > From: [email protected] [mailto:[email protected]]
> > On Behalf Of Ryan Richards
> > Sent: Thursday, April 25, 2013 5:30 AM
> > To: [email protected]
> > Subject: [svg-developers] Seed 514 in feTurbulence causes squares
> > 
> >  
> > 
> >   
> > 
> > Seeds 514, 1977, 2337, 4777, 8032, 9615 (only checked 0-10000) cause blank
> > squares in feTurbulence in Firefox, Inkscape, and Batik. Is it the algorithm
> > itself or the implementations?
> > 
> > <svg version="1.1" width="338" height="488"
> > xmlns="http://www.w3.org/2000/svg">
> > <defs>
> > <filter id="Seed">
> > <feTurbulence type="turbulence" baseFrequency="0.1 0.1" numOctaves="5"
> > seed="514"/>
> > </filter>
> > </defs>
> > <path d="m0,0 h338 v488 h-338 v-488" filter="url(#Seed)"/>
> > </svg>
> > 
> > 
> > 
> > 
> > 
> > [Non-text portions of this message have been removed]
> >
>




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