Jonathan, I don't see it as peculiar at all since "SVG is a language for describing two-dimensional graphics in XML." [1] (the lighting filters are the only exception to that AFAIK). In any case what you are talking about is 3D graphics. There is no reason perspective correct transformations couldn't be included in a future version of the SVG specification(s) however.
Cheers /Erik [1] http://www.w3.org/TR/SVG11/intro.html On Tue, 22 Jan 2008 14:39:01 +0100, ~:'' ありがとうございました。 <[EMAIL PROTECTED]> wrote: > Erik, > > isn't it peculiar that a fairly simple perspective distortion is missing > from the SVG spec? > ie just as you describe by increasing scaling along a line > > especially given it's importance and history in western art? > > removed the typo, and updated slightly, thanks > > regards > > Jonathan Chetwynd > Accessibility Consultant on Media Literacy and the Internet > > > > On 22 Jan 2008, at 12:05, Erik Dahlström wrote: > > On Tue, 22 Jan 2008 12:52:47 +0100, ~:'' ありがとうございました。 > <[EMAIL PROTECTED]> wrote: > > > there's a simple Brick Pattern here: > > http://peepo.co.uk/temp/brick-pattern.svg > > You might want to remove the space in patternUnits="objectBounding Box". > > > feDisplacementMap may well be a possible route, however it does seem > > somewhat complex in the relation to the concept. > > Not sure that would be able to give true perspective correct images > though. > > > On 21 Jan 2008, at 23:27, Frank Bruder wrote: > > > > Hi, > > > > would be great if full 3x3 matrices--without the third row implicitly > > set to [0 0 1]--were allowed for transform values. This would allow > > for perspective distortions. But I'm not sure if this wouldn't be too > > difficult for implementors since singularities (the horizon) would > > need to be dealt with, in case they become visible. > > Indeed the 2d transforms that are in SVG today are not capable of > handling > this case. > > > There was a question before regarding perspective distortion of text. > > And I remember someone suggested using the filter primitive > > feDisplacementMap. But no solution for creating the correct image > > data to use for in2 was found then. Maybe this was resolved in the > > mean time. > > There are other tricks, for example drawing the image repeatedly (with > clipping) while varying the scale transform. > That would probably look a bit ugly though, possibly it could be smoothed > out a bit by using filters or masks. > > Cheers > /Erik > -- Erik Dahlstrom, Core Technology Developer, Opera Software Co-Chair, W3C SVG Working Group Personal blog: http://my.opera.com/macdev_ed ----- To unsubscribe send a message to: [EMAIL PROTECTED] -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: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
