P3D Re: Where is the stereo window?

["David W. Kesner" <drdave@xxxxxxxxxx>]

In p3d digest 3741 Dr. T. writes:

> Here is the problem:  The surface of the creen and the surface
> of the paper are physical surfaces.  You can see the image going
> through this physical (real) surface.  When you view a slide in
> a viewer, the window is a black border.  It does not have a
> physical location.  You view the scene with respect to this
> border.

It does have a physical border and that is the window aperture 
created by the mount - or the edge of the image.

> Assume that the scene is a scenic with infinity included and not
> real close objects.  Instead of mounting this slide with the
> window located "at 7 feet", I push the window back, closer to
> infinity.  Instead of seeing the mountains get closer to me, I
> see the stereo window getting bigger as it is being pushed
> further towards infinity.  What do you see in this case?

I see the mountains move closer to me.

Let me try this on you. Assume you have a close-up of a flower in a 
vase in front of a wall. Total depth of the scene is less than three 
feet. Instead of mounting this slide with the front flower just behind 
the window, I push the window back so that the flower now comes 
through. Are you saying you also see this as the window getting 
bigger?

I see the stereo window just like I see a real window. It is fixed in 
place and the scene moves from in front - to at - to in back of it.

That's all for now,

David W. Kesner
Boise, Idaho, USA
drdave@xxxxxxxxxx