# Drawing unit vectors: Ox_3d_unit_vector Oy_3d_unit_vector Oz_3d_unit_vector frame_3d

### 14.3.1 Drawing unit vectors: Ox_3d_unit_vector Oy_3d_unit_vector Oz_3d_unit_vector frame_3d

The Ox_3d_unit_vector command takes no arguments and draws the unit vector in the x-direction on a three-dimensional graphic screen.

#### Example.

Input:

Ox_3d_unit_vector()

Output:

Similarly, the Oy_3d_unit_vector and Oz_3d_unit_vector commands draw the unit vector in the y and z directions, respectively.

These commands have no parameters, but can be decorated with the legend command.

#### Example.

Input:

Ox_3d_unit_vector(), legend(point([1,0,0]),"unit x vector",blue)

Output:

The frame_3d command draws all three vectors simultaneously.

#### Example.

Input:

frame_3d()

Output: Output: