Lenticular Material ?

[Jim Beals <kgrafx@xxxxxxxxxxxxx>]

Hi to all, I've just joined your internet world here.  My first posting. 
I've got a need if someone has the answers I'm all ears.

I want to dabble with lenticular 3D for video projection.  I saw some
information that said a 3D glassless projection can be made using 2 rear
projectors (in my case I want to do video, but it could be slides or movie
film) and using 2 sheets of lenticular material back-to-back as the 'screen'
(it didn't say, but I am thinking it may need a piece of rear screen
material in the middle so the image can appear on somthing...)
                _____              _____
                |       |               |       |
                |____|               |____| --------- 2 PROJECTORS
                   |_|                    |_|          

    



        =======================   ----- 2 SHEETS OF LENTICULAR 
                                                                BACK TO BACK



                        O  --------   THE VIEWER

The information I read only mentioned 2 rear screen projectors, however,
after thinking it over, it would seem to need at least 3 (ala the 3 lens 3D
cameras) or 4 (ala the Nimslo/Nishika variety) or more (to give a finer and
smoother look to the 3D image).    I have 2 video projectors so I could try
it using them to see what happens, and if it needs 3 or more projectors,
then maybe I can try slides to see what happens.
 
The idea would seem to work, as lenticular prints work by shooting 3 or more
negs down from a special enlarger through the lenticular material onto the
print film. The linear lenses of the lenticular material create alternating
strips of each negative behind each lens (line of the lenticular material).
Then, when viewing the viewers vision passes through the same lenticular
which focuses each eye onto a different strip - giving left/right eye
separation (hey, I know, all of you already know all this better than I -
I'm repeating it here just for clarity). The rear-screen video use of
lenticular would seem to do the same thing - in a different way.  The
projectors would take the place of the enlarger and negs and the lenticular
on the back side would do the job the lenticular did when making a print
(spliting the different images into strips behind the lenticular lenses).
The lenticular on the front side would do the same as the lenticular does
when viewing prints, it would focus each eye onto separate strips.  All this
really makes me feel that 3 projectors would be the minimum required - while
4 or 8 or 12 would be best. Quite a heavy cost for doing away with the
glasses - but it is something I've never seen, and I just want to see how
effective it is     -  Wow, maybe I should just ask that first....
 
"Has anyone out there actually "seen" a rear screen back-to-back lenticular
projection without the use of 3D glasses ? - and if so - what was the effect
?  How good was the deepth and how bad was the ghosting - compared with
polarized glasses  -  and how many projectors were used ???"   Was it video
/ slide or movie film ?   

Anyway, I want to experiment and try it out........ One BIG problem though - 

"Anyone out there know where I can find lenticular material ?  especially
some that is large enough to make a reasonably sized rear-projection screen
????"
I don't have the spare change to get it custom made.
If anyone knows of a supplier, please let me know.

(I have seen lenticular rear projection screens, very expensive, and the one
I saw was a giant freznel lens, not lines - not applicable to my needs (and
costs over $10k).   Large rear projected screen TV's use a lenticular, but I
noticed the lines were not rounded, but were pointed (triangular as apposed
to semi-spherical) so would not be usable either.)    

thanks - 


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