[off topic] see thru projection


    Mar 27 2006 | 12:21 pm
    hi list,
    i am looking into a material that will allow me to project onto glass.
    the effect is meant for theatre production in which a man sits behind a
    glass panel (inside a glass box actually), when not using projection the Man
    should be fully visible. when using the projection i strive to control how
    much of the man behind the audience can see.
    i know that sometimes a fabric called scrim is used for this effect, when
    lit from behind it is transparent and when front lit (in a specific angle?)
    it it opaque.
    i want to know if anybody had the opportunity to work with such setup. or if
    another material, more glass like is available.
    prices would be nice but hypothesizing is always welcomed.
    thank.
    links to stuff i found on scrim-
    Rosco US : Technotes : Screens : Basics
    What types of scrims are there for Theater, Retail Displays, Photography,
    and Exhibit Design

    • Mar 27 2006 | 1:22 pm
      if you'd got a big budget: http://www.holopro.de/
      :)
    • Mar 27 2006 | 2:01 pm
      Peppers Ghost effect. http://www.dafe.org/misc/peppers/peppers.htm
      Or careful use of lighting on the subject, coordinated with the
      projection. You can use any cheap scrim from a fabric store. You
      might just get a few yards of various sheer material and try it out
      to see what works best.
      Brian
    • Mar 27 2006 | 2:10 pm
      > i want to know if anybody had the opportunity to work with such
      > setup. or if another material, more glass like is available.
      > prices would be nice but hypothesizing is always welcomed.
      > thank.
      you can project onto plexiglass, this works! it tends to only
      reflect lighter parts of the projection (naturally as far as screens
      go it has a negative gain factor)
      i've used studio-productions scrims before, you can pretty much trust
      their website for what it says.
      one thing about working with scrims and projection, to achieve
      'transparency' you really need to have whats called a 'flapper'
      installed on the projector. its a small motor mounted at the head of
      the projector, which you attach a 'flap' to be able to remotely cover/
      uncover the lens, thus blocking ALL the light. (because with any lcd
      or dlp based projector, 'black' is nowhere near 'absolute black' and
      it will destroy the illusion. you can also cover the lens by hand
      if it is low tech and accessible.
      also, do a search on "Pepper's Ghost" you might enjoy this effect as
      well.
      --deKam
    • Mar 27 2006 | 4:47 pm
      or even this
      I'll take five ;-)
      Simon
    • Mar 27 2006 | 11:50 pm
      I am using for my project a very cheap transparent fabric.. is more
      transparent than a fabric scrim...I have double feelings about it.,..
      but it does makes the effect that I was looking for... but if you have
      a big budget I would buy a scrim I know that for the kind of effect
      that you want to achieve there are several kinds that may feet
      there.....