Okay, I was wrong. On two points...
What I'd forgotten is that LCD displays produce polarized light (and so
do TFT displays, for that matter), so you don't need a sheet of
Polaroid to polarize the light from the vertical display.
The half-silvered mirror is there (of course, I hear the cries) to make
sure you have enough light reflected from the "horizontal" monitor to
be about the same as the light transmitted from the vertical one.
On 4 Feb 2008, at 12:09, Harry Powell wrote:
> Hi
>
> Just looking at the diagrams, I don't think the glass is half-silvered
> - it looks like a large sheet of Polaroid™. It only needs to polarize
> the transmitted light from the vertically oriented monitor, since the
> reflected light from the interface between two materials (at least one
> of which has a refractive index) will be polarized in any case (that's
> why your Polaroid™ sunglasses let you see below the waves...). My
> physics is too rusty to remember, but I think the vertical monitor in
> this case needs to be polarized vertically, since the reflected
> polarized light will be horizontal.
>
> No idea where you can buy large sheets of Polaroid™ though.
>
> IMWBW, though...
>
> On 4 Feb 2008, at 11:30, P Hubbard wrote:
>
>> Hi Andrew,
>>
>> Just like the commercial systems, the glass is the only special piece
>> of kit (which can be bought separately). The LCD monitors are just
>> set up to display either left or right channel. If you ask me, I
>> think these companies are just a rip off!
>>
>> Paul
>>
>> > Date: Mon, 4 Feb 2008 11:24:32 +0000
>> > From: [log in to unmask]
>> > Subject: Re: [ccp4bb] 3D Glasses - Vuzix HMD by eDimensional
>> > To: [log in to unmask]
>> >
>> > P Hubbard wrote:
>> >
>> > > Just an FYI.... you can build those yourself at a fraction of the
>> price!
>> > > You just need the special piece of glass, two identical LCD
>> monitors,
>> > > and an edited X config file.
>> >
>> > The clever bit of the Omnia system (and the similar one from Planar,
>> > which being from the US might be cheaper there...?) is the DVI
>> > "reflector" card that flips the image to be displayed on the screen
>> seen
>> > in the half-silvered mirror.
>> >
>> > Are you implying that an appropriately written Xorg.conf can get the
>> > graphics card to do this instead? The prospect is very appealing!
>> >
>> > Regards,
>> >
>> > Andrew
>> >
>> > --
>> > Dr. Andrew Raine, Head of IT, MRC Dunn Human Nutrition Unit,
>> > Wellcome Trust/MRC Building, Hills Road, Cambridge, CB2 2XY, UK
>> > phone: +44 (0)1223 252830 fax: +44 (0)1223 252835
>> > web: www.mrc-dunn.cam.ac.uk email: [log in to unmask]
>>
>> Helping your favorite cause is as easy as instant messaging. You IM,
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> Harry
> --
> Dr Harry Powell, MRC Laboratory of Molecular Biology, MRC Centre,
> Hills Road, Cambridge, CB2 2QH
>
>
>
Harry
--
Dr Harry Powell, MRC Laboratory of Molecular Biology, MRC Centre, Hills
Road, Cambridge, CB2 2QH
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