[whatwg] Dealing with Stereoscopic displays

ddailey ddailey at zoominternet.net
Mon Apr 26 19:15:12 PDT 2010

No it isn't simple. Allied issues have been discussed here before.

As the nature of input devices become richer (e.g. eye movement glasses that 
give binocular disparity data to the display device) then the nature of the 
convergence data that defines the scene becomes more relevant to its primary 
"semantics".  As SVG and 3D technologies begin to bridge the gap between 2 
and 3D (cf. the <replicate> proposal [1] or [2] ) the distinction between 
styling and markup so tenaciously held in HTML may cease to be so clearcut.


[2] http://srufaculty.sru.edu/david.dailey/svg/SVGOpen2010/replicate.htm

----- Original Message ----- 
From: "David Singer" <singer at apple.com>
To: <whatwg at lists.whatwg.org>
Sent: Monday, April 26, 2010 8:02 PM
Subject: Re: [whatwg] Dealing with Stereoscopic displays

I agree that this probably means that web elements that are 'flat' would be 
styled by CSS with a depth.  This is important if other material presented 
to the user really is stereo (e.g. a left/right eye coded movie).  The movie 
will be set so that the eyes are expected to have a certain 'convergence' 
(i.e. they are looking slightly inward towards some point) and it's 
important that if material is overlaid on that. it has the same convergence. 
Obviously, this is unlike the real world where focus distance and 
convergence distance are the same (focus distance is fixed at the screen 
distance), but the brain can get very confused if two things that are both 
in focus are at difference convergence distances.

This is not a simple question, as I expect you are beginning to realize.

David Singer
Multimedia and Software Standards, Apple Inc.

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