Standard direction vectors for positioning and movement.
Format
An object of class numeric of length 3.
An object of class numeric of length 3.
An object of class numeric of length 3.
An object of class numeric of length 3.
An object of class numeric of length 3.
An object of class numeric of length 3.
An object of class numeric of length 3.
An object of class numeric of length 3.
An object of class numeric of length 3.
An object of class numeric of length 3.
An object of class numeric of length 3.