to stop a rigidbody for a moment (works like a pause, only it's only for this object)

Questions & Answers
1

if I want the rigidbody to stop for a moment (think of it as freezing in time, only this object, while others are still working) I should save it's velocity and angular velocity on FixedUpdate and restore it on FixedUpdate as well, correct?

the the thing is - I need the object to always react the same - imagine us going back in time after the object is frozen (but before it's unfrozen) and each time we should see the "unfrozen" rigidbody reacting the same. Acting just as it was (and as it would be, if it wasn't frozen);

so in part-pseudocode - I assume - restoring velocity and angularVelocity in fixedUpdate like

function Update(){
    if press a button //freeze
       yield WaitForFixedUpdate;
       saveVelocity = rigidbody.velocity;
       saveAngularVelocity = rigidbody.angularVelocity;
       rigidbody.isKinematic = true;

if press a button for the second time //unfreeze
   yield waitForFixedUpdate
   rigidbody.isKinematic = false;
   rigidbody.WakeUp();
   rigidbody.velocity = saveVelocity;
   rigidbody.angularVelocity = saveAngularVelocity

} ?

would do the trick, correct?

2

Looks fine to me. Probably no need for the yields.

A fleshed-out version might look something like this:

var paused = false;
var saveVelocity : Vector3;
var saveAngularVelocity : Vector3;

function Update() {

    if (Input.GetKeyDown(KeyCode.Space)) {

        // toggle pause state
        paused = !paused;

        if (paused) {
            saveVelocity = rigidbody.velocity;
            saveAngularVelocity = rigidbody.angularVelocity;
            rigidbody.isKinematic = true;
        } else {
            // un-paused
            rigidbody.isKinematic = false;
            rigidbody.velocity = saveVelocity;
            rigidbody.angularVelocity = saveAngularVelocity
            rigidbody.WakeUp();
        }
    }
}