Change here object and crystallographic data for a single plane or a list of planes.
To modify a plane, click over its graphic image, or write its identification
(name and number) on the
Plane entry. To modify a list of planes, press
the button
List (after creating the list of planes with
Plane->Select).
Parameters for empty entries or
Local choices remain unchanged.
To change a plane name write the new name in the
Plane entry,
followed by the plane number (GAMGI needs the number to identify the plane).
To change the name for a list of planes, press
List first
and then write the new common name in the
Name entry.
Reference
GAMGI can handle crystallographic planes (selecting
Cell), related with
a cell containing the relevant crystallographic information, and atomic planes
(selecting
Atoms), defined by three non-colinear atoms.
For a single plane,
Reference can be
Cell,
Atoms
or
Local. For a list of planes,
Reference must be
Local.
When
Cell or
Atoms is selected, the plane is recreated
from scratch (as if using
Plane->Create) and its old content is
removed. As this requires local information for each plane, it cannot
be done for a lists of planes. When
Local is selected, previous
features and contents are preserved, unless when specifically changed.
Cell
To create crystallographic planes, set
Reference to
Cell.
GAMGI automatically shows a
Cell entry,
h,
k,
l
entries to indicate the plane indices, plus a
Vectors menu, to select
the cell vectors to use,
Conventional or
Primitive. For the sake
of simplicity, GAMGI does not accept 4-indice notation for planes or directions
in hexagonal cells.
Pressing the mouse over a cell in the current layer, the cell identification
is automatically written in the
Cell entry. When a valid cell is found
and its
Type is
Projection, the default
Polygon page
is automatically replaced by a
Projection page.
Atoms
When
Reference is set to
Atoms, GAMGI automatically shows
three
Atom entries. Pressing the mouse sucessively over three
non-colinear atoms in the current layer, the three entries become occupied
and the plane defined. After pressing
Ok, an error is shown if the
atoms are disposed linearly.