Direction Create


When reference is cell, the direction is crystallographic so direction indices are required and its parent must be a cell. When reference is atoms, the direction is described by two xyz coordinates so the direction becomes independent of the atoms used to define it.
Example: <direction ... reference="cell"/> (default)
Allowed values: cell, atoms (optional)

u, v, w

Set the indices u, v, w defining a crystallographic direction. The three indices cannot be all zero. An error is shown when these indices are not indicated for a crystallographic direction or when they are indicated for an atomic direction.
Example: <direction ... u="1" v="0" w="0"/> (no default)
Allowed values: integer (required, coupled)


Set the type of cell vectors, conventional or primitive, used to determine the direction with u, v, w indices. When the lattice is primitive there is no difference between conventional or primitive cell vectors. An error is shown when vectors is set for an atomic direction.
Example: <direction ... vectors="conventional"/> (default)
Allowed values: conventional, primitive (optional)


An atomic direction is always represented as a line. A crystallographic direction can also be represented as a pole or a trace (for projected directions).
Example: <direction ... model="line"/> (default)
Allowed values: line, pole, trace (optional)