Sorry, the cells do not rotate nicely around the center of the cell. I tried to fix it, but it did not work...obviously.

SCC
BCC
FCC
To activate a crystal click on it.

To activate mouse rotation press "r".

To zoom out or zoom in use "<" and ">".

To use the mouse to move the crystal from side to side press "t" first.

"c" chould center the crystal, but it doesn't work very well.