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ISSUE-224 (3D): SMPTE liaison: 3D [TTML.next]

From: Timed Text Working Group Issue Tracker <sysbot+tracker@w3.org>
Date: Thu, 30 May 2013 14:13:46 +0000
Message-Id: <E1Ui3bu-0006nS-Fo@crusher.w3.org>
To: public-tt@w3.org
ISSUE-224 (3D): SMPTE liaison: 3D [TTML.next]


Raised by: Pierre-Anthony Lemieux
On product: TTML.next

[The following is extracted from the liaison received from SMPTE at https://lists.w3.org/Archives/Member/w3c-archive/2012Sep/0214.html]

See Sections 6.1.2, 6.3.6 and 6.3.7 at ST 428-7.

A zValue style parameter shall be applicable to individual <p> elements for the purpose of defining the rendering of the element in terms of left- and right-eye stereoscopic images. 

zValue shall be the horizontal distance between the origin of the element as rendered in the left eye and right eye images. Half of the zValue shall correspond to the horizontal distance between the origin of the element as rendered in either the left or right images, and the origin of the element in the absence of a zValue. Positive (negative) zValue values shall move the element away from (closer to) the viewer.

zValue shall be a signed decimal number and shall be expressed as a percentage of the width of the root container region.

The vertical position of the element shall be unchanged by the application of zValue, and shall be identical in both left- and right-eye images.

zValue shall apply to the entire content of the <p> element.

The zValue style parameter shall be animatable, without interpolation. In order to avoid markup duplication, it shall be possible to define a given sequence of <set  tts:zValue="…"> elements once and apply it to multiple <p> elements.
Received on Thursday, 30 May 2013 14:13:51 UTC

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