Re: Project-or-View screen

[P3D Gabriel Jacob <jacob@xxxxxxxxxxxxxx>]

In the thread about the Project-or-View screen, the discussion
was about the View aspect but I would like to comment on the
project part. While I was watching the movie Asteroids on TV and
helping my daughter draw some pictures with her coloring pencils
and checking P3D during the commercials and thinking about 3D
in general, I had a thought. While helping her draw a picture
(in 2d ;-( ) I happened to use one of the silver colored pencils.
This got me to thinking, hey this looks similiar to the silver
screen color used in 3d projection. I remembered the comments
about making your own silver screen by using silver paint and
spray painting it.

After trying out different glasses and plastics to see how they
polarize in the view screens I thought to try out the silver
colored pencil to see how this works for projection. What did
I have to loose but some time. So I colored in a portion of a white
piece of paper with it then took a 2d projector and projected the
image thru a polarizer and then on the piece of drawing paper with
the silver drawn on it. The image projected very well on it and could
be seen very readily. The whites of the image projected were white
on the screen, i.e. paper! Then I viewed the image with a polarizer
and rotated the polarizer till the image turned black. I was
pleasently surprised that it worked! 

The pencil in question, that was used was a Berol Prismacolor #349.
I would guess most silver color pencils should work also. It has
to be the silver colored ones and not the gray ones which didn't
work very well. Also regular lead pencils worked fairly well but
the whites were not as white as the silver pencil.

Gabriel thinking if it's possible to make a 3d projector and screen
for under 20 bucks! 


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