really simple definition
Im doing some work with some surfaces. and am starting the question some
very elementary stuff.
definition of a polygon to me, any 2D shape made with straight lines all
connected to each other once, and only once (so number of vertices =edges)
polyhedra, and 3D shape made up of polygons basically.
question is it possible to have 4d polyhedra, or are they something special
the final definition which is troubling me
what is a surface.
i thought it was a dimension -1 of the dimension of the shape
so 3d shape, has 2d surface, eg the ball has the surface which is 2d
2d shape (circle) has 1d surface- (the line)
just wondering if these definitions are right.
.
Relevant Pages
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(sci.math) - Re: Extraxt pixel values from satellite images
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(comp.soft-sys.matlab) - Re: Finding edges of a given polyhedra in 3D
... How can I find the edges of a polyhedra in 3D having only coordinates ... You might take the middle of each pair of the vertices and check whether it is in the interior any tetrahedron. ... This should give an algorithm to start with. ... Similarly, for the 2D polygon, I don't think the original diagonal ...
(comp.theory) - Re: Extraxt pixel values from satellite images
... inpolygon method to get a mask of the polygon (in 2 dimension - ... then i would run over the K dimension and get all the values of the ...
(comp.soft-sys.matlab) |
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