[webkit-dev] css: rotateY(90) with perspective()

Tue Feb 12 14:28:01 PST 2013

Those render exactly the same for me in chrome and ff:
http://jsfiddle.net/8pyDK/
What OS are you testing on? It seems that the perspective is ignored.

On Tue, Feb 12, 2013 at 2:18 PM, Marcin Szamotulski <mszamot at gmail.com>wrote:

> I opened a new bug report:
> https://bugs.webkit.org/show_bug.cgi?id=109613
>
> Best,
> Marcin
>
> On 12:07 Tue 12 Feb     , Levi Weintraub wrote:
> > Either way, I'd suggest you take this conversation to a specific bug
> report
> > :)
> >
> >
> > On Tue, Feb 12, 2013 at 11:49 AM, Shawn Singh <shawnsingh at chromium.org
> >wrote:
> >
> > > Hi Marcin,
> > >
> > > I wonder if you might accidentally have a "perspective-origin" set
> > > differently?  Or maybe there is something in your code where window
> size
> > > that affects how the transforms appear?  Maybe you can attach a reduced
> > > simple example of the difference you're seeing?   I just whipped up the
> > > following example, which renders almost exactly the same geometry on
> both
> > > Firefox and tip-of-tree Chromium.
> > >
> > > <body>
> > >   <div style="-moz-transform: perspective(500px) rotateY(80deg);
> > >
> > >
> > >
> > >               -webkit-transform: perspective(500px) rotateY(80deg);
> > >
> > >
> > >
> > >               background-color: lime;
> > >
> > >
> > >
> > >               width: 300px;
> > >
> > >
> > >
> > >               height: 300px;" >
> > >     HELLO WORLD
> > >   </div>
> > > </body>
> > >
> > >
> > > Changing the rotateY to use 90deg makes the layer disappear for both
> > > Firefox and Chromium, too.
> > >
> > > ~Shawn
> > >
> > >
> > >
> > >
> > > On Tue, Feb 12, 2013 at 9:53 AM, Dana Jansens <danakj at chromium.org>
> wrote:
> > >
> > >> +shawnsingh
> > >>
> > >>
> > >> On Tue, Feb 12, 2013 at 9:22 AM, Marcin Szamotulski <
> mszamot at gmail.com>wrote:
> > >>
> > >>> Dear WebKit-Dev,
> > >>>
> > >>> I found an interesting difference between implementation of css 3d
> > >>> transforms in Gecko (FireFox) and Chromium (WebKit).  In Gecko, the
> > >>> following css rule:
> > >>>
> > >>> tranform: perspective(500px) rotateY(90)
> > >>>
> > >>> rotates an element (let say an image) so that it is perpendicular to
> the
> > >>> viewer, i.e. it shows the side of the element - hence nothing is
> printed
> > >>> to the screen, since html elements have no depth.  While in WebKit
> based
> > >>> browsers (I have tested this in both Chromium and surf from
> suckles.org)
> > >>> the elements is shown at an angle: both rotations (Gecko & WebKit)
> have
> > >>> the same axis (the vertical screen directions).  Testing different
> > >>> angles I have found that I need to use rotateY(107deg), but this
> might
> > >>> depend on the perspective.   The reason for this is that WebKit and
> > >>> Gecko are computing 3d view in a different way.  The additional minor
> > >>> difference is that rotateY(30deg) in Gecko turns an element 30deg to
> the
> > >>> right while in WebKit it rotates to the left (with a different 3d
> view).
> > >>> The reason I found it is because I try to make an animation which
> turns
> > >>> a picture around 180deg showing a new picture on the other side, and
> > >>> I wanted to change the picture in the middle (90deg).  This works for
> > >>> Gecko but for WebKit I need to know how to compute the angle at which
> > >>> the element (image) is perpendicular to the view source (showing its
> > >>> side to the viewer).  Can somebody point me how the 3d rotationY with
> > >>> a given perspective is calculated so I can make the necessary
> > >>> converstion.
> > >>>
> > >>> Best regards,
> > >>> Marcin Szamotulski
> > >>> _______________________________________________
> > >>> webkit-dev mailing list
> > >>> webkit-dev at lists.webkit.org
> > >>> https://lists.webkit.org/mailman/listinfo/webkit-dev
> > >>>
> > >>
> > >>
> > >
> > > _______________________________________________
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> > > webkit-dev at lists.webkit.org
> > > https://lists.webkit.org/mailman/listinfo/webkit-dev
> > >
> > >
>
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