I make game cards ( http://ã¢ãã¡ã¤ãã .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 svg-developers@yahoogroups.com, "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: svg-developers@yahoogroups.com [mailto:svg-developers@yahoogroups.com] > On Behalf Of Ryan Richards > Sent: Thursday, April 25, 2013 5:30 AM > To: svg-developers@yahoogroups.com > 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] > ------------------------------------ ----- To unsubscribe send a message to: svg-developers-unsubscr...@yahoogroups.com -or- visit http://groups.yahoo.com/group/svg-developers and click "edit my membership" ----Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/svg-developers/join (Yahoo! ID required) <*> To change settings via email: svg-developers-dig...@yahoogroups.com svg-developers-fullfeatu...@yahoogroups.com <*> To unsubscribe from this group, send an email to: svg-developers-unsubscr...@yahoogroups.com <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
