W3C home > Mailing lists > Public > www-svg@w3.org > November 2013

Re: SVG 3D transforms

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Mon, 25 Nov 2013 17:36:47 -0800
Message-ID: <CAAWBYDDokRt6rwU-K2F=sM6=Pv7g2aAio-nUPWboR0_cGaRF4g@mail.gmail.com>
To: Jelle Mulder <pjmulder@xs4all.nl>
Cc: www-svg <www-svg@w3.org>
On Mon, Nov 25, 2013 at 3:19 PM, Jelle Mulder <pjmulder@xs4all.nl> wrote:
> Tab, all
>
> Three-dimensional transform functions and the properties ‘perspective’,
> ‘perspective-origin’, ‘transform-style’ and ‘backface-visibility’ can not be
> used for the elements: <clipPath>, <linearGradient>, <radialGradient> and
> <pattern>.
>
> I understand the reasons for this, but I was wondering the following. If you
> have an external source file linked, you <use> it and change the fills to
> discard the gradients and patterns etc. Can you then use it with
> perspective. In other words, after cleaning the offending attributes?

You're misreading the restriction.  You can't use 3d transforms on the
<clipPath>, etc. elements *themselves*.

You can certainly use it on elements like <rect> which *use* a
gradient fill or the like.  Just like 2d transforms, all the
filling/stroking/clipping/etc is done pre-transform.

> Is it possible to 3d transform a path and THEN use it to clip something
> after the transform? Can you 3d transform a bitmap image? Because then you
> can transform a path and clip your bitmap in it.

I'm not sure.  The spec isn't clear on whether the prohibition on
using 3d transforms on <clipPath> applies to its descendants as well.

> This also touches a use case which would make it desirable to have some sort
> of pre rendering method in order to do 3d transforms on any SVG content.
> Clippath and Mask elements will be used a lot in illustrations. Clippath and
> Masks are a delight for any serious illustrator. It's a bit of a bummer that
> all that content will not be able to be rendered using 3d transforms.
> Probably with an unwitting author being baffled why it doesn't work, blaming
> the browser/viewer first.
>
> If there was some pre rendering method one could use, to first render and
> image of the object and do the 3d transform afterwards, we could discard the
> need for doing that on the server using imagemagick, Batik or Inkscape,
> creating some png that can be transformed.

That's how it already works, as I explained above.

~TJ
Received on Tuesday, 26 November 2013 01:37:47 UTC

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