Andittravelsbyonestepoverinthehorizontaldirection, thatisthe A latticeparameter, andthenduringthatdistance, thattravel, ittravelsup a riseofthelatticeparameter.
Soifwelookatthatvectorinthethree-axissystemnow, itwouldbethevectorthatoriginatesattheconventionaloriginandthentravelsoneoverinthe X, oneoverinthe Y, andoneupinthe Z.
OK, sothatmeanswe'vegotthisvectornowthatoriginatesattheconventionaloriginofourcubeandtravelsouttowardsus, towardsyouthisway, I suppose, andrisesupbyhalfoftheunitcell, halftheheightinthe Z direction, beforeitexitsthatfrontface.