Rigidbody.AddTorque

function AddTorque (torque : Vector3, mode : ForceMode = ForceMode.Force) : void

Description

Adds a torque to the rigidbody.

As a result the rigidbody will start spinning around the torque axis.

JavaScript

// Spins the rigidbody around the global y-axis

function FixedUpdate () {
    rigidbody.AddTorque (Vector3.up * 10);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void FixedUpdate() {
        rigidbody.AddTorque(Vector3.up * 10);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def FixedUpdate():
        rigidbody.AddTorque((Vector3.up * 10))

If you want to apply a force over several frames you should apply it inside FixedUpdate instead of Update.

function AddTorque (x : float, y : float, z : float, mode : ForceMode = ForceMode.Force) : void

Description

Adds a torque to the rigidbody.

As a result the rigidbody will start spinning around the torque axis.

JavaScript

// Spins the rigidbody around the global y-axis
function FixedUpdate () {
    rigidbody.AddTorque (0, 10, 0);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void FixedUpdate() {
        rigidbody.AddTorque(0, 10, 0);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def FixedUpdate():
        rigidbody.AddTorque(0, 10, 0)