The polyhedron needs a central atom. But you can add that yourself. The
command appears to be undocumented --

assign {attachmentAtom} "Symbol" {x y z}

For example:

assign atom {atomno=14} "Cl" {2 3 4}

That position {2 3 4} could also be an average position of a number of
atoms:

assign atom {atomno=14} "Cl" {2 3 4} {atomno=14 or atomno=13 or atomno=12
or atomno=11}

then you would also need to do the connections before creating the
polyhedra.

HOWEVER, with a bit of a tweak of Jmol, I can make this possible without
connecting the atoms. You  will still need a central atom, though. Let me
get back to you on this.

Bob


On Fri, Sep 7, 2012 at 8:16 AM, Nikolay Bogdanov
<nikol.bogda...@gmail.com>wrote:

> I'm trying to make a figure showing the coordination of metal ions in
> crystal - they form network of tetrahedra. I can do this with bonds, but the
> figure looks confusing. It would be much more clear with opaque
> tetrahedrons.
>
> As I understand Jmol builds polyhedra around some central atoms, which are
> missing in my case. So I wonder is there a way to build the polyhedra just
> from bonds.
>
> Thanks,
> Nikolay
>
>
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-- 
Robert M. Hanson
Larson-Anderson Professor of Chemistry
Chair, Chemistry Department
St. Olaf College
Northfield, MN
http://www.stolaf.edu/people/hansonr


If nature does not answer first what we want,
it is better to take what answer we get.

-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
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