P3D Re: Hollow Face Illusion

[George Themelis <gthemelis@xxxxxxxxx>]

--- Rod Sage <rsage@xxxxxxxxxxxxxxxxxxxx> wrote:

> It would be interresting if someone with one of these faces
> would photograph the face in stereo using light sources from
> different angles and then mount some regular and some psuedo. 


I was planning to do something like that today...  One factor in
this illusion is the size of the image or the distance to it. 
The closer you come, the stonger the stereopsis information that
is working against the illusion.  So how close do you photograph
this and how do you view it (viewer vs. projection?)

> Does the light have to be from below to get a normal face when

> mounted normal? 

No, it does not have to, but it certainly reinforces the
illusion.  When Bruce said the he does not get the illusion, I
suspect that not having the light from underneath has a lot to
do with it. 


=====
George Themelis (DrT-3d@xxxxxxxxxxxxxxxx)
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