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Re: [csswg-drafts] [css-transforms-2] Interpolation of perspective. (#3084)

From: CSS Meeting Bot via GitHub <sysbot+gh@w3.org>
Date: Wed, 02 Oct 2019 23:47:28 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-537726846-1570060047-sysbot+gh@w3.org>
The CSS Working Group just discussed `Interpolation of perspective.`, and agreed to the following:

* `RESOLVED: Close https://github.com/w3c/csswg-drafts/issues/3084 no change`

<details><summary>The full IRC log of that discussion</summary>
&lt;dael> Topic: Interpolation of perspective.<br>
&lt;dael> github: https://github.com/w3c/csswg-drafts/issues/3084<br>
&lt;dael> smfr: emilio noticed perspective property and transform function interpolate different. property is just length value. Function is matrix interpolation. Gives different results. I think he's right they should be same<br>
&lt;dael> smfr: I'm not sure how they differ visually. WOuld be interesting to see if look really different or slightly different<br>
&lt;dael> AmeliaBR: prob different b/c one creates an inverse<br>
&lt;dael> Rossen_: Isn't the codepen in the issue enough?<br>
&lt;dael> smfr: That's just snapshotting one point, not showing animation<br>
&lt;dael> AmeliaBR: Converting perspective funct to matrix isn't consistant with other transforms. rotate we interpolate to a single value<br>
&lt;Rossen_> would this test case be enough? https://bug1488414.bmoattachments.org/attachment.cgi?id=9006258<br>
&lt;dael> AmeliaBR: My preference would be to follow that patter and interpolate the param to the perspective function rather then a matrix. Unless there's an impl reason why that can't work. Apparently FF used to do that and emilio changed to match spec<br>
&lt;dael> AmeliaBR: otoh if we now have conforming impl maybe we stick with that<br>
&lt;dael> Rossen_: Do we have conforming implementations?<br>
&lt;dael> smfr: Chrome and Safari match. Not FF. I think<br>
&lt;dael> mwoodrow: Do you know what Chrome and Safari are doing?<br>
&lt;dael> smfr: Not offhand<br>
&lt;Rossen_> q?<br>
&lt;dael> AmeliaBR: According to issue they do what spec does and generate transform matrix from funt and interpolate. According to linked FF bug which was fixed in FF63 FF is now doing same<br>
&lt;smfr> q-<br>
&lt;heycam> q- smfr:<br>
&lt;heycam> q- Not<br>
&lt;heycam> q- off<br>
&lt;dael> mwoodrow: So we do have matching impl now<br>
&lt;dael> Rossen_: Is proposed to punt on this and resolve no change?<br>
&lt;dael> AmeliaBR: Not used enough to insist on a change<br>
&lt;dael> Rossen_: Objections to resolve close no change?<br>
&lt;dael> smfr: Should we do this without emilio?<br>
&lt;dael> Rossen_: He can re-open if he wants to<br>
&lt;birtles> it seems weird to me<br>
&lt;dael> RESOLVED: Close https://github.com/w3c/csswg-drafts/issues/3084 no change<br>
</details>


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Received on Wednesday, 2 October 2019 23:47:29 UTC

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