W3C home > Mailing lists > Public > www-style@w3.org > September 2012

Re: [css3-transitions] Frame Rate

From: Jon Rimmer <jon.rimmer@gmail.com>
Date: Fri, 28 Sep 2012 14:24:38 +1000
Message-ID: <CA+ZDCiDFAQQfMCqjmPZYgqppiGb2pfm=v6M6nFQ8433uGQSdQQ@mail.gmail.com>
To: Sylvain Galineau <sylvaing@microsoft.com>
Cc: François REMY <fremycompany_pub@yahoo.fr>, David Singer <singer@apple.com>, Martijn Korteweg <martijn@mediaartslab.com>, "www-style@w3.org" <www-style@w3.org>
On 28 September 2012 10:23, Sylvain Galineau <sylvaing@microsoft.com> wrote:
> The browser will play it for the requested duration. Of course, this may
> mean extra frames in between the ones specified in the rule. As currently
> designed, this is a feature of CSS Animations, not a bug.
> It's possible there is a use-case for animations where the developers
> specified a frame rate and defines each frame i.e. there is no interpolation.
> I am not sure this could be just an additional property or an extension on
> the current @keyframes, however.
> It would be helpful to see such animations as exported.

There may not necessarily be data available for every frame. Animators
don't tend to draw them all, just a subset, and animation tools do the
same sort of interpolation as browsers [1], except they also provide
the ability to limit the final framerate. Of course, the tools could
be modified to generate the interpolated keyframes in CSS as well, but
in terms of the original request in this thread, it seems like a
simple framerate cap without disabling interpolation or needing to
specify every frame is what the animators want.

It would be useful to hear from animators, either from Media Arts Lab
or elsewhere, on concrete reasons for wanting framerate limiting. Is
it just a case of recreating an aesthetic feel, are there difficulties
or artifacts that only become apparent when animations are displayed
at 60fps or above? Do any of the Adobe representatives have anything
to add? You guys have a lot of customers in the animation field.

I actually agree with David that artifiically recreating the
deficiences of earlier era technology simply to achieve familiarlity
can be somewhat absurd and detrimental, but I wanted to make sure what
was being requested here was properly understood at least.

That said, it's worth noting that every day, thousands of teenagers
are posting Instagram photos to Facebook that recreate the flaws of
cameras built and obsoleted well before they were born. Even if you
dislike the trend, it's clear that there's something more going on
that a simple preference for the familiar. In spite of our instincts
as technologists, the relationship between fidelity and aesthetics is
not always as simple as higher = better.

[1] http://en.wikipedia.org/wiki/Inbetweening

Jon Rimmer
Received on Friday, 28 September 2012 04:25:07 UTC

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