# Group Create

### x, y, z

Set the coordinates of the group origin.
```Example: <group ... 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 polytope group. This is needed because the group position is defined relatively to its reference atoms, so when x,y,z and e1,e2,e3 are 0 the group 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: <group ... 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 group 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: <group ... 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)
```