[Kala Rackley]

Holy smokes. You got it. I’ve been trying to figure out which suggestion would work for hours!

For anyone else landing on this thread, I used
value – parent.parent.parent.transform.rotation;

and I placed it as an expression under Rotation for the Child layer.

Thanks again Dan!

[Kala Rackley]

Dan,

I’m glad that it was you that responded! I’ve been reading your answers to other questions re: expressions, and it has been helpful. Thank you.

Can you please tell me where to add the expression? Under position or rotation? And under the Child object (pedal), right?

Thanks again!

[Kala Rackley]

I know that this is an old thread, but I figured instead of starting a new one, I would just tag on!

I am trying to keep a pedal rotating with a bike gear, but still face upward so that the foot can rest on it. I am getting ready to dive into Duik or Dan’s IK expressions for the legs, and I have all of the wheels and gears going nicely with Carl Larsen’s Vehicle Rig expressions.

However, I cannot get the pedals to stay upright! I have tried this expression you suggested: “value – parent.transform.rotation;”. I am unsure exactly where to put it though. Rotation? Position? I have a null that is parented to the pedal “bar”, which is parented to the gear. The pedals are parented to the nulls.

Help? Thank you!