Re: [boost] Library Proposal: Boost.Geom 2D and 3D GeometricPrimi tives

From: Martin Bonner (martin.bonner_at_[hidden])
Date: 2005-06-29 05:35:05

----Original Message----
From: Anis Benyelloul [mailto:benyelloul_at_[hidden]]

> " There is no such a thing as a 2D point, There is even no such a
> thing as 2D, the world is 3D, and all points are 3D. Now, some point
> are always located on Z=0 plan and don't need to actually store their
> Z attribute, we call them 2D points."

Actually one of the current popular physical theories is that the world is
11D (or is it 15?).  

[Snip]

>> Mixing 2D and 3D points doesnt actually happen in my experience.
>> They live in separate spaces.
> Like I say, 2D points are elements of IRxIR which is U which is part
> of IRxIRxIR which is the set of all 3D points.  It just a matter of
> how you look at things ..

Yes, but insisting that people consider 2D points a subset of 3D points
(rather than a different concept which is isomorphic with a subset of 3D
points), is probably a mistake.

-- 
Martin Bonner
Martin.Bonner_at_[hidden]
Pi Technology, Milton Hall, Ely Road, Milton, Cambridge, CB4 6WZ,
ENGLAND Tel: [phone]