Re: How to draw 3D objects with 7 sides?

You probably want to go with something other than a heptahedron for
several reasons. Like Raymond suggests you'll need a base so as not to
set it on anyone's face. Also there is no really nice looking
hepthedron other than an extruded pentagon shape, seven sides but I
don't think it would do your project justice. There are others but
they get pretty funky, and I don't mean that in a good way, looking.
On the other hand, an octahedron is two four sided pyramids placed
bottom to bottom, but it really doesn't sit in an upright looking
manner unless it's in a stand of some sort. I'd suggest something
more along the lines of a truncated octahedron. It gives you 14
faces, 7 hexagons and 7 squares. Here's an example image:
http://www.mathconsult.ch/showroom/unipoly/08.html

You could use the squares for something like NASA logos or dates or
whatever it's your design, and the seven hexagons for the faces. With
this shape the item is more spherical like you were looking for and,
IMHO, more pleasing to the eye.

Just my 2 cents,
Mike


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Raymond Heckert" <jnr@a...>
wrote:

> Why not start with a sphere, and cut 8 facets in it, equally spaced

apart,

> one bottom, one top,. and 3 in the 'southern hemisphere', staggared

with 3

> in the 'northern hemisphere', extending each circular facet, until they
> touch? If you have trouble with it, I'll offer my help... let me know.
> Oh... why 8 facets?? Well, you really need a base for the Memorial,

so it

> wouldn't rest on someone's face. BTW, if you're doing this on your own,
> it's a very noble gesture to some very brave (still) pioneers.
>
> RayHex
>
> ----------
> > From: Greg Pettengill <gpetteng@b...>
> >
> > Dear Fellow CAD-aholics,
> >
> > I would like to design memorial pieces for the space shuttle

crews, so I

> would like to have a seven sided object, with one face for each member.
> >
> > Somehow I thought it would be a lot easier than it has turned out

to be

> and I was wondering if I had jumped the track or something! I guess

I am

> looking for a 7 sided geodesic sphere? Some questions that come to mind
> are; what is it properly called, are they at all useful, where do

they hide

> because I cannot recall ever seeing one....