A position in cell space is given by the coordinates of the three cell vectors. To convert to absolute space, the cell rotation, translation and zero node translation must be applied. A position in reference space is given by the coordinates of the three reference vectors. To convert to absolute space, the reference rotation, translation and zero node translation must be applied.

The alignement consists in translating the cell so the cell and the reference entered positions become the same.

Cell

The entries x, y, z indicate the coordinates of the three cell vectors for a given position. These coordinates can be given in terms of Conventional or Primitive vectors, using the Vectors menu.

Reference

The reference can be the current layer (the default) or another cell. To select a cell as reference, press Cell and click on its visual representation (or write its identification directly on the enabled entry). The entries x, y, z indicate the coordinates of the three reference vectors for a given position. When the reference is a cell, these are the cell vectors. When the reference is the layer, these vectors are the layer orthonormed axes. The reference coordinates can be given in terms of Conventional or Primitive vectors, using the Vectors menu. When the reference is the layer, only the option Conventional is available.

Pressing Ok on the second level dialog, the Align information is saved but the actual translation is calculated only after pressing Ok on the first level dialog, to ensure that changing later some cell parameters will not produce wrong results.

To disable the Align information, open again the second level dialog, which now shows the previously entered data, and press Cancel.