Thanks, that appears to do the trick. However, to get it to work I needed to add two joints to the child object: a fixed joint to secure it to the parent object (which it was acting independently of) and a spring joint to connect to another. This seems wasteful: I have one more joint and one more rigidbody than I need for every link I create. Is there a way to optimize this?

Thanks!

This method Warwick describes works for me, I am using SpringJoints on the hair and hands of a character to get secondary animation on them based on their parent's motion. In my case I am not using fixed joints. For each thing I want floppy, I:

• Create an Empty GameObject (I call them null points) called "Anchor"

• place it at the point of the neutral position of the appendage I want floppy and Parent it to that child object or bone (By the way I would use bones or null points to do your world of Goo style thing)

• Add a Rigidbody to that Anchor point and set the IsKinematic on

• Create a 2nd Empty GameObject called "Springy" and position it near but a little bit away from the Anchor - but DO NOT parent this one

• Add a RigidBody to Springy and turn its Gravity on

• Add a SpringJoint to Springy and set its Connected Body property to the Anchor null in your scene

• Set Gizmos for each of the null points and turn on Gizmos for runtime

• Play with the numbers for Spring, Damper and drag until you get the motion you like and then you can turn off runtime Gizmo display

In my case, multiple SpringJoints are on separate bones of the parent object. I wish someone had spelled out use of SpringJoints for me before (the docs are horrible) and I find them quite useful... :)