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<title>GAMGI Interfaces: Direction Create</title>
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<h1>Direction Create</h1>
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<ul>
<li><span>Type</span></li>
<li><a href="create_scope.html">Scope</a></li>
<li><a href="create_projection.html">Projection</a></li>
<li><a href="create_view.html">View</a></li>
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Set here the properties of a crystallographic or atomic direction.
<h3>Reference</h3>
GAMGI can handle crystallographic directions, related with a cell containing
the relevant crystallographic information, and atomic directions, defined by
two non-coincident atoms.
<p/>
To create crystallographic directions, set <b>Reference</b> to <b>Cell</b>.
GAMGI automatically shows a <b>Cell</b> entry, plus <b>u</b>, <b>v</b>, <b>w</b>
entries to indicate the direction indices, plus a <b>Vectors</b> menu, to select
the cell vectors to use, <b>Conventional</b> or <b>Primitive</b>. For the sake of
simplicity, GAMGI does not accept 4-indice notation for planes or directions
in hexagonal cells.
<p/>
Pressing the mouse over a cell in the current layer, the cell identification
is automatically written in the <b>Cell</b> entry. When a valid cell is found
and its <b>Type</b> is <b>Projection</b>, the default <b>Line</b> page
is automatically replaced by a <b>Projection</b> page.
<p/>
By default, only one family of crystallographic directions is created.
To create a set of families simultaneously, press the button <b>Set</b> (TODO).
<p/>
When <b>Reference</b> is set to <b>Atoms</b>, GAMGI automatically shows
two <b>Atom</b> 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 <b>Ok</b>, an error is shown
if the atoms are coincident.
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