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<title>GAMGI Interfaces: Group Modify</title>
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<h1>Group Modify</h1>
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<ul>
<li><span>Type</span></li>
<li><a href="modify_scope.html">Scope</a></li>
<li><a href="modify_tolerance.html">Tolerance</a></li>
<li><a href="modify_view.html">View</a></li>
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Change here the reference object data for a single group only.
<p/>
To modify a group, click over its graphic image, or write its identification
(name and number) on the <b>Group</b> entry. To modify a list of groups,
press the button <b>List</b> (after creating the list of groups with
<b>Group->Select</b>). Parameters for empty entries or <b>Local</b>
choices remain unchanged.
<p/>
To change a group name write the new name in the <b>Group</b> entry,
followed by the group number (GAMGI needs the number to identify the group).
To change the name for a list of groups, press <b>List</b> first
and then write the new common name in the <b>Name</b> entry.
<h3>Reference</h3>
GAMGI can handle groups that are just object containers (selecting
<b>Container</b>), and coordination polyhedra, requiring a central
atom (selecting <b>Polytope</b>).
<p/>
For a single group, <b>Reference</b> can be <b>Container</b>, <b>Polytope</b>
or <b>Local</b>. For a list of groups , <b>Reference</b> must be <b>Local</b>.
<p/>
When <b>Container</b> or <b>Polytope</b> is selected, the group
is recreated from scratch (as if using <b>Group->Create</b>) and its
old content is removed. As this requires local information for each group,
it cannot be done for a lists of groups. When <b>Local</b> is selected,
previous features and contents are preserved, unless when specifically changed.
<h3>Container</h3>
The primary purpose of a group container is to contain other objects.
When a group container is created, it has no child objects and consequently
no visual representation. The only way to select an empty group is
thus to write its identification or to use the mechanisms provided
by <b>Group->Select</b>.
<p/>
To avoid this problem, when <b>Ok</b> is pressed and the new group is
created, the dialog <b>Group->Create</b> is automatically replaced by
<b>Group->Link</b>, with the new group identification already inscribed
on it. How to link objects to a group is described in the section
<b>Group Link</b>.
<h3>Polytope</h3>
For an arbitrary cloud of atoms, defined by <b>Central</b> and
<b>Neighbours</b> settings, build a coordination polyhedron defined
by the smallest convex polygonal representation that surrounds all
the atoms. This is often used in Crystallography to build tetrahedra,
octahedra, and other small regular solids, but the method can be used
to build polyhedra for an arbitrary set of atoms, independently of
their position or number.
<p/>
When Gamgi cannot build a 3D polyhedron, automatically tries to build
a 2D atomic plane, as in <b>Plane->Create</b>. When a 2D plane cannot
be defined, automatically tries to build a 1D atomic direction, as in
<b>Direction->Create</b>. When a 1D direction cannot be defined, an
error is shown.
<h3>Central</h3>
Enter here the name and number of the central atom, around which the
coordination polyhedron will be built. Pressing the mouse over an atom
in the current layer, the atom identification is automatically written
in the <b>Central</b> entry.
<p/>
When <b>Local</b> is selected (the default), only one polyhedron is
constructed, around the <b>Central</b> atom. When <b>Global</b> is
set, Gamgi builds coordination polyhedra around all the atoms in
the sampling universe with the same element as the <b>Central</b>
atom.
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