Realistic Bounce Script?

How can you create a realistic bounce effect using scripting?

I know you can do a rigidbody.AddForce but that wouldn't be realistic.

How could you make it so that depending on where an object bounces it will bounce off in different directions.

BTW: Object bounces of a circular substance (if that matters).

This user simply copied the answer from here:

Either provide a link or write your own answers. Normally I wouldn't think of editing an answer like this, but your copy & pasting isn't acceptable, and this isn't the first time you've done it.

I have been using this formula
#pragma strict
var firstTimeVelocitySave = false;
var savedVelocity : Vector3;
var myRigidbody : Rigidbody;
var BounceRate:float =1.5;

function OnCollisionEnter(col : Collision) {
//print("Collision! " + rigidbody.velocity);

if (! firstTimeVelocitySave) {
	savedVelocity = rigidbody.velocity;
	firstTimeVelocitySave = true;

myRigidbody.velocity.y = savedVelocity.y;