Limit Driver rotation

Support Animation and Rigging
1

Hi

Feel like this should be an easy thing but getting a little stuck, Drivers are a bit of an unknown territory for me

So I have a driver set up so that object A rotation on the y-axis is determaned by object B’s location on the X axis

Using this expression: " var/90*20 "

This works fine, however, it rotates on a 360 I want to limit that so that when it reaches a certain rotation on a positive Y rotation it stops and on a negative y rotation it stops.

I tried a Limit Rotation Constraint, which kind of works but jumps back to max rotation as it still thinks it’s doing a 360

Hopefully That all makes sense.

If you have any further questions I’m happy to answer

Thanks for any help in advance

2

You want to use max(a,b) and min(a,b) Python functions here.

If that’s the case, then you want to run the max and min on var. As an example, max(min(var, 720), -720) will return the lowest of var and 720 (clamping the upper bounds to 720) and then return the highest of that and -720 (clamping the lower bounds to -720.) You would use that expression in place of “var”, so your full expression would look like (max(min(var, 720), -720))/90*20.

1 Like
3

Worked, Thank you so much. really appreciate it!