conjunction with the shutter-type 3D glasses. From what I understand,
a fresnel lens increases the focal distance of objects viewed through
it?
I tried a fresnel lens once, it made my 17" monitor look like a 25".
Anybody tried the Wicked3d red-blue 3D glasses with N4 or GPL?
Gerald Moore
> Hi Todd,
> I just got those glasses a couple of weeks ago, and here is what I found
> (on a small monitor). The focusing length itself is, at least on
> distances of around 1m and farther not the real measure of depth. The
> eye (or at least, my eye :) ) and the brain rather quickly adapt to
> focusing on the screen distance but at the same time on a stereoscopic
> virtual image that is farther away. The focus is in my experience really
> not quite as important as the paralax for discerning object.
> Alos, do the following experiment. Write something on the top of a piece
> of paper, hold it at a stretched arm's length, close one eye, but then
> look at some object just above the top of the paper that is far away
> (assuming that you are holding the paper in such a direction ;) ). If
> it's bright enough (which means that your iris isn't open too wide),
> you'd probably still be able to read the text even though you're
> focusing at effectively infinity. Now, open both eyes and do the same,
> and you'll have a much harder time discerning things on the paper, as
> the paralax would ruin it all.
> That's basically the reason why shutter glasses give a rather good
> impression of depth even though yopur eyes are focusing on only the
> distance of the screen. The brighter the screen and the surroundings,
> the better it would work.
> -Gregor
> > I get it now. Never thought of that. I bet that page flipping with 3-D
> > shutter glasses on a full size (proper FOV) screen would take care of that
> > automatically since you're effectively looking into, rather than at, the scene
> > and focusing the same as you would in real life. On a small screen, it'd *sort
> > of* work, but not quite as well. Agree/disagree?
> > Todd Wasson