Local offset of spring controller

[giuseppetonello]

I'm trying to get the local offset values of the cross helper you see in the attached image.

The helper has a spring controller and is linked to the box.

The box and the sphere are linked to the object called bound, which is animated along the x axis, so that you can see the spring animation in action.

$Spring.controller.position.x gives me the world coordinates, which I don't need.

Instead I would like to get that 22.016 number, which displays correctly in the parent space, as you see in the second image.

As an extra, once I get that value  (how much the spring offsets from the box) I need to plug it in a float script to drive the box y rotation, via a float script.

[giuseppetonello]

Ok, I've found the solution myself.

This line of code did the trick (inside the y rotation controller).

$Spring.transform.pos * inverse $bound.transform