Animation made easy

There are three newly created animation commands (SPIN, TRAVEL and ORIENT), which make 3D animation really easy. I created these after contemplating for a long time. You may have some suggestions for me to improve or change these commands. If so, please reply to this thread.

1. SPIN: The SPIN command spins an object (or objects within a transform object) on an asix. 

Syntax: SPIN id direction cycleInterval

Description: Spin object with id as id,  in one of the six axes directions as direction,  with a loop cycleInterval. The direction is a Logo word and only in the twelve: right, rt, left, lt, tiltright, tr, tiltleft, tl, rollup, ru, rolldown, rd. The cycleInterval must be a non-zero positive number.

Example: 

CS BOX ; create  a box with id  obj_0
SPIN "obj_0 "right 10  ; spin the box in the right turn direction with a 10 second cycle

2. TRAVEL: Travel an object according to a given path (a set of coordinates).

Syntax: TRAVEL id path cycleInterval

Description: Make the object id travel along a path. The path is a Logo list containing at least two coordinates. The cycleInterval specify the cycle time in seconds to travel. 

Example: 

CS BOX ; create  a box with id  obj_0
TRAVEL "obj_0 [ [0 0 0] [0 1 0] [0 0 0] ] 10  ; The box travels from (0,0,0) to (0,1,0) then back to (0,0,0) linearly with a 10 second cycle

3. ORIENT: Orient an object according to a given set of directions. This is a more complex and flexible way of changing orientation of objects than SPIN command.

Syntax: ORIENT id directions cycleInterval

Description: Make the object id orient with the given directions. The directions is a Logo list containing at least two directions. The cycleInterval specify the cycle time in seconds to orient.

Example: 

CS BOX ; create  a box with id  obj_0
ORIENT "obj_0 [ [0 0 1 0] [0 -1 0 1.5708 ] [0 0 1 0] ] 10  ; The box orients (rotates) from (0,0,1,0) to (0,-1,0,1.5708) (right 90) then back to (0,0,1,0) linearly with a 10 second cycle

To remove these animation, you can use the following associated commands:

removespin id
rmspin id 

Remove the spin animation on object id.

removeorient id
rmorient id 

Remove the orient animation on object id.

Ideas anyone?