CollisionDetectionMode.Discrete

Description

Continuous collision detection is off for this Rigidbody.

This is the default collision detection mode, and it is the fastest mode. Collisions for this collider will only be checked at the content's Time.fixedDeltaTime.

//This script allows you to switch collision detection mode at the press of the space key
//Attach this script to a GameObject
//Click the GameObject, go to its Inspector and click the Add Component Button. Then, go to Physics>Rigidbody.

using UnityEngine;
using UnityEngine.UI;

public class Example : MonoBehaviour
{
    Rigidbody m_Rigidbody;

    void Start()
    {
        m_Rigidbody = GetComponent<Rigidbody>();
    }

    public void Update()
    {
        //Press the space key to switch the collision detection mode
        if (Input.GetKeyDown(KeyCode.Space))
            SwitchCollisionDetectionMode();
    }

    //Switch between the different Collision Detection Modes
    void SwitchCollisionDetectionMode()
    {
        switch (m_Rigidbody.collisionDetectionMode)
        {
            //If the current mode is continuous, switch it to continuous dynamic mode
            case CollisionDetectionMode.Continuous:
                m_Rigidbody.collisionDetectionMode = CollisionDetectionMode.ContinuousDynamic;
                break;
            //If the current mode is continuous dynamic, switch it to continuous speculative
            case CollisionDetectionMode.ContinuousDynamic:
                m_Rigidbody.collisionDetectionMode = CollisionDetectionMode.ContinuousSpeculative;
                break;

            // If the curren mode is continuous speculative, switch it to discrete mode
            case CollisionDetectionMode.ContinuousSpeculative:
                m_Rigidbody.collisionDetectionMode = CollisionDetectionMode.Discrete;
                break;

            //If the current mode is discrete, switch it to continuous mode
            case CollisionDetectionMode.Discrete:
                m_Rigidbody.collisionDetectionMode = CollisionDetectionMode.Continuous;
                break;
        }
    }
}