P3D ortho?

[John Toeppen <toeppen@xxxxxxxx>]

 I rather enjoy the discourse on "ortho" stereo and definition of terms.
The word "orthoscopic" is related to perpendicular viewing of objects
for "drafting" purposes.  Such drawings do not account for dimmunition
of size as a function of distance - they lack perspective.  A very long
focal lens will produce this effect.

Ortho probably also means correct or right.  "Right" probably refers to
perpendicular - like putting up a Christmas tree: "is it "right" yet?" 
Anyway, an "accurate" stereo perspective maybe should be a called
"correct" rather than "ortho."

John Toeppen
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