Version: 2017.4

Physics.bounceThreshold

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public static float bounceThreshold ;

Description

Two colliding objects with a relative velocity below this will not bounce (default 2). Must be positive.

This value is usually changed in Edit->Project Settings->Physics inspector instead of from scripts.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { void Example() { Physics.bounceThreshold = 1; } }