[dorkbotsyd-blabber] 3D projection

Gav the.mechatronics.guy at gmail.com
Mon Sep 12 01:01:29 EDT 2011


You'd have to get things like keystone, height, width and such mapped pretty
close, though.

On Mon, Sep 12, 2011 at 3:00 PM, Jake Anderson <yahoo at vapourforge.com>wrote:

> **
> The projectors should be able to be mounted pretty much anywhere.
> they are just doing a normal projection job, provided you get a polarised
> image on the screen by any means it'll work.
>
>
> On 09/12/2011 01:16 PM, Gav wrote:
>
> Wow, I'm impressed that he's made it himself!
>
> The bit about the silver screen being necessary is interesting. I'm
> surprised he can paint and sand up something that works nicely and doesn't
> ruin the polarisation, cool.
>
> I'd be curious to know if he has to mount the projectors at a precise
> inter-ocular spacing. I know a few home-brew 3D cameras suffer from this, so
> you have to mount the cameras at weird angles to get the two lenses close
> enough, then rotate in software.
>
> Cheers,
> Gav
>
> On Mon, Sep 12, 2011 at 1:09 PM, Mr Aras <aras.vaichas at gmail.com> wrote:
>
>> Most cinemas use RealD (TM). This uses circular polarized lenses. One lens
>> is clockwise polarized, the other is anti-clockwise.
>>
>>  http://en.wikipedia.org/wiki/RealD_Cinema
>>
>>  I did a quick search on "DIY RealD " and found this YouTube video that
>> explains the process in reasonable detail.
>>
>>  http://www.youtube.com/watch?v=_wRv3UaYgAw
>>
>> Check the comments in the YouTube link!
>>
>>  repeated here:
>>
>>  Here's a small clip showing a movie actually playing on my home cinema.
>> I use two projectors each equipped with the filter from one of the eyes of
>> a pair of RealD 3D glasses. (Bought at the cinema.) You mount the filters as
>> if the projector is wearing the glasses. You also need a program that can
>> read a blue-ray or dvd with a stereo movie on it. You can't just use a
>> regular movie. 3D can't be created from a single 2D movie so don't bother
>> asking...
>>
>> Update:
>> I am getting a lot of video-replys from people trying to duplicate this in
>> different ways. I need to clarify a few points...
>>
>> 1. I use two projectors
>>
>> 2. The projectors are showing a DIFFERENT version of the film designed for
>> tha eye their filter matches.
>>
>> 3. The source of the video is a blu-ray with a frame-progressive 3D
>> version of the movie. This means that it contains both versions interleaved
>> so that it would play on a single projector or TV and you'd need
>> shutter-glasses to view it.
>>
>> 4. This was ment as a demonstration of home-use. It shows that indeed the
>> image seen in left and right filter is different.
>>
>> 5. The 3D move was split into two streams. One for each eye.
>>
>> 6. The application used to play back the two streams is called
>> Stereoscopic Player and the demo allows you to try it out for 5 minutes each
>> time you start it.
>>
>> 7. You NEED a silver screen. A gray or white one will not work well as the
>> light is absorbed and retransmitted. This ruins the polarization so the
>> images blend. I painted my screen on a MDF-board using acrylic silver paint
>> and a roller. (Remember to prime twice first and sand smooth!)
>>
>> 8. For those who wonder how light can be circularly polarized I recommend
>> wikipedia. Read the article on circular polarization. It's a headache but it
>> IS real...
>>
>> 9. Recording your own 3D content is EASY and you only need two cameras
>> spaced a bit apart. Tilt them slightly towards a common focus point (point
>> of convergence) and make this point close to the object of interest so
>> people will be able to focus on it without getting a headache.
>>
>> 10. NO you do not need to use any filters on the cameras when you film.
>> You use the filters when you project the movie(s) to polarize the light so
>> that the RealD-3D glasses can seperate the images again for your eyes.
>>
>> 11. The paint I used is called Liquitex Acrylic Basics Matt Silver.
>>
>> Aras
>>
>>
>>  On 12 September 2011 13:01, Ian Woolf <iwoolf at gmail.com> wrote:
>>
>>> A friend is setting up an exhibition and needs help for the Imax-style 3D
>>> stereo projection part of it, can anyone give me pointers on who could do
>>> this?
>>> thanks,
>>>                       Ian
>>> 0419 603 992 <0419%20603%20992>
>>> ........................................................................
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