Rotating a wheel on all axis

[candyflipping]

Does anybody know how to rotate a wheel on all axis, i have been having trouble using expressions and i had trouble using vmag. I don't know any thoughts. Thanks

Tom
candyflipping1@yahoo.com

[faulknermano]

i'm not sure if this is what you want:

if you already know how to get the rotation based on a vector's vmag, you can create two nulls. in the first null, you attach and expression that will rotate the null's PITCH based on the movement of your target object along the Z axis. for the second null, attach an expression that will rotate the null's BANK based on the target's X axis. then orient constrain the balls rotation to those two nulls. you dont have to parent the nulls to anything.. and it may be preferable so as not to potentially confuse layout.. just a thought..