Tim Crane (wen1/stereo++at++wenet.net)
Thu, 26 Aug 1999 19:41:30 -0700
Angus Dorbie wrote:
> Passive stereo can use color masking or multiple projectors and
> polarizing filters. There is another cool temporal method which uses
> ploarized shuttering over the display and passively polarized glasses.
>
> You asked specifically about color glasses an this is easy, you just
> need two overlapping channels and appropriate glColorMask calls in the
> channel draw callbacks. Obviously the quality is better if you can use
> polarizing methods and multiple overlapping projectors but that depends
> on your display environment.
>
> The main compromise with the color masking is color reproduction, and
> some colors produce zero contrast in one or other eye. Monochrome
> rendering is really the only easy option.
>
> Polarizing is better and you only really lose some brightness, 50% or
> 25% depending on shuttering vs multiple projector approach. It costs you
> for the extra projector (or shutter) and channel, and you either need
> more framebuffer area or quad buffering (stereo visual) depending on the
> chosen method (but on iR it's practically free if you only start with 1
> channel, the rendering cost is obviously there for all methods) and the
> shuttering approach will be line rate constrained for the monitor. I've
> only seen the shutter used in a Tektronics demo years ago, I'm not sure
> where you'd obtain a polarizing shutter today and don't know if you
> could easily sync it to the stereo vof as you can crystal eyes LCD
> emitters. It was such a cool idea somebody must be doing it.
>
> Cheers,Angus.
>
> k. lukose wrote:
> >
> > Can someone offer any information on "passive" stereo viewing on an Onyx2-IR.
> > By this, I mean a system where the left and right eye images are *superimposed*
> > (rather than flashed alternately) on each frame, each in a different color. The
> > viewer resolves the image by viewing the screen through correspondingly colored
> > (and very cheap) eye-glasses - similar to entertainment 3D movies.
> >
> > The questions are:
> > - is this at all possible?
> > - what are the software tools needed to put one together?
> > - what are the resulting compromises in visual fidelity?
> >
> > Thanks.
>
> --
> For years now, whenever NT has been proven to have some debilitating
> weakness we've heard from MS advocates that NT would catch up, there was
> just an incredible faith in this OS and Microsoft's ability to somehow
> get there. With the recent results of the Linux vs NT serving benchmark
> that same attitude can be seen in the Linux community. The Linux folks
> aren't too worried, "Sure the single threaded IP stack was slow but
> it'll be fixed in the next release.", it's eerily familiar but I have
> confidence in the Linux community's ability to remedy problems and I
> don't groan in pain as I used to when Microsoft made similar claims.
>
> For advanced 3D graphics Performer + OpenGL based examples and tutors:
> http://www.dorbie.com/
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Tim Crane StereoGraphics Tech Support 2171 E. Francisco Blvd. San Rafael CA 94901 415-459-4500 x206 415-455-1844 fax internet: timc++at++stereographics.com (transmuted from - tcrane++at++crystaleye.com) Web: http://www.stereographics.com *** This letter printed on 100% recyclable phosphor. ***
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