Re: [photo-3d] First P3D use of term?

[pd@xxxxxxxxxxxxx]

Dr. George A. Themelis writes:
> > > If the subject is large and/or close, such that parts of the
> > > subject are occluded by the frame edges, you must consider the
> > > stereo window, the stereo pyramid...
> >
> > Please elaborate on the term, John!
> 
> I'll take a guess... The field of view in stereo photography
> is in the shape of a pyramid.  A stereo pyramid!  Actually,
> it is a truncated rectangular pyramid.  The top is the stereo 
> window.  From there it extends to infinity.  The vertices are 
> defined by the 4 corners of the stereo window.

Believe it or not, there's a name for this truncated pyramid shape
... frustum.  This comes up a lot in computer graphics in describing
the volume of space that can be displayed in a 3D model.

-pd

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                             Peter Davis
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