Re: Pulfrich effect

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Thu, 15 May 1997 
>From: P3D Ronald J Beck  writes:
>
>>From my understanding of the pulfrich effect, the best method would be to 
>make your own film.  Take a video camera and aim it out the car window.  
>Now, drive around town while the camera's running.  With a bit of prior 
>planning you can find a lot of areas that have good 3D settings.  There 
>are several tree-lined streets in our neighborhood where the trees form a 
>canopy above the street. Children's soccer games might also make a good 
>film.  Or running events.  Any action that has lateral movement.
>
>Now, for the rest of the list, should the camera be aimed out the 
>passenger side or the driver's side (US steering orientation for our 
>foreign friends :-))  Then, what side should the dark lens be on?  What's 
>the rule on this?  Action left to right, dark lens on left?  
>
>Hey, maybe I'll get into the pulfrich 3D movie making business:-)  Where's 
>that case of Barq's?
>

The very easiest method is simply to watch TV with your glasses. The effect
is generated with ANY on-screen sideways movement and the depth is relative
to the direction and different speeds. Since most TV shows have movement in
all directions, the most ideal method is to quickly reverse the glasses as
the action changes. Don't try to memorize the direction, just figure it out
as you go and it will quickly be apparent which is which.

Ideal Pulfrich glasses would automatically shade different eyes signaled by
a separate direction track, or by manual control with a small switch. 

If the glasses are only worn on one eye, the motion must always be in the
same realtive directions, potentially boring... or dizzymaking... If you are
shooting your own, try from both sides of the car. Remember that any
relative motion works. If you track someone walking, they will stay
relatively centered in the frame while the background is moving. Depending
on your glasses this will put the person either in front of the background
or behind it. In front is easier to visually accept. 

A pulfrich director is a picture motion director more than a motion picture
director.

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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