Set here a crystallographic or atomic direction.
Reference
GAMGI can handle crystallographic directions, related with a cell containing
the relevant crystallographic information, and atomic directions, defined by
two non-coincident atoms.
To create crystallographic directions, set
Reference to
Cell.
GAMGI automatically shows a
Cell entry, plus
U,
V,
W
entries to indicate the direction 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
Line page
is automatically replaced by a
Projection page.
By default, only one family of crystallographic directions is created.
To create a set of families simultaneously, press the button
List.
When
Reference is set to
Atoms, GAMGI automatically shows
two
Atom entries. Pressing the mouse sucessively over two
non-colinear atoms in the current layer, the two entries become occupied
and the direction defined. After pressing
Ok, an error is shown
when the two atoms are coincident.