### x, y, z

Set the coordinates of the direction origin.

Example: **<direction ... x="0.0" y="0.0" z="0.0"/>** (default)
Allowed values: real (optional, coupled)

### center_x, center_y, center_z

Set the current center position for a line direction. This is needed because
the direction position is defined relatively to its reference objects, a cell
or atoms, so when x,y,z and e1,e2,e3 are 0 the direction is in its initial
position. Therefore there is no relation between origin and center (unlike
cell or text objects for example) and the latter must be specified.

Example: **<direction ... center_x="0.0" center_y="0.0" center_z="0.0"/>**
(no default) Allowed values: real (optional, coupled)

### e1, e2, e3

Set the three Euler angles controlling the direction orientation. The first
rotation (e1), around the initial y axis, must be between

**0** and

**180** degrees. The second rotation (e2), around the initial z axis,
must be between

**0** and

**360** degrees. The third rotation (e3),
around the final z axis, must be between

**0** and

**360**.

Example: **<direction ... e1="0.0" e2="0.0" e3="0.0"/>** (default)
Allowed values: e1: **0.0** - **180.0**, e2, e3: **0.0** - **360.0**
(optional, coupled)