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<title>GAMGI Interfaces: Direction Modify</title>
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<h1>Direction Modify</h1>
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<ul>
<li><a href="modify_type.html">Type</a></li>
<li><a href="modify_scope.html">Scope</a></li>
<li><a href="modify_projection.html">Projection</a></li>
<li><span>Position</span></li>
<li><a href="modify_view.html">View</a></li>
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<div class="contents">
Change here the position and orientation for a single direction or a list
of directions.
<p/>
To modify a direction, click over its graphic image, or write its identification
(name and number) on the <b>Direction</b> entry. To modify a list of directions,
press the button <b>List</b> (after creating the list of directions with
<b>Direction->Select</b>). Parameters for empty entries or <b>Local</b> choices
remain unchanged.
<p/>
To change a direction name write the new name in the <b>Direction</b> entry,
followed by the direction number (GAMGI needs the number to identify the direction).
To change the name for a list of directions, press <b>List</b> first
and then write the new common name in the <b>Name</b> entry.
<h3>Translation</h3>
The position of a direction object can be changed using the <b>X</b>, <b>Y</b>,
<b>Z</b> entries. The change can be <b>Absolute</b> or <b>Relative</b>
(to the current position).
<p/>
To go back to the initial position, set <b>X</b>, <b>Y</b>, <b>Z</b>,
to <b>0</b>, <b>0</b>, <b>0</b>, in <b>Absolute</b> mode.
<h3>Rotation</h3>
The orientation of a direction object, defined by the Euler angles theta,
phi, psi, can be changed using the <b>E1</b>, <b>E2</b>, <b>E3</b> entries.
The change can be <b>Absolute</b> or <b>Relative</b> (to the current
orientation). Euler angles are not addictive, so the direction is
rotated back with the old angles and forward with the new ones.
<p/>
To go back to the initial orientation, set <b>E1</b>, <b>E2</b>,
<b>E3</b>, to <b>0</b>, <b>0</b>, <b>0</b>, in <b>Absolute</b> mode.
<p/>
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