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[Pranav <>]

Hi,

I am studying Nef polyhedron documentation. The 1st figure in /Definition/
section, shows local pyramids for all faces of the polyhedron /P/. 

I would like to know the following: 

1. What does /R+/ mean in definition of local pyramid /Q/(in the
documentation)?

2. Since /Pyr/ is defined only for points in d-dimensional space, does
Pyr(f) where /f/ is a 2-face is compact representation of referring to all
points in face /f/ at once?

3. How local pyramid of face /f1/ is Null? I find it a bit confusing because
as per definition of local pyramid /Q = x + (R+)*(Intersection(P, U(x)) -
x)/ and here /x/ is a point in the d-dimensional space. It means at least
/x/ is always a part of /Q/, thereby making it a non-empty set. 



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Thanks in advance,
Pranav
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