Unity Script Reference – Physics.gravity

Physics.gravity

The gravity applied to all rigid bodies in the scene.

Gravity can be turned off for an individual rigidbody using its useGravity property.

JavaScripts

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Awake() {
Physics.gravity = new Vector3(0, -1.0F, 0);
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Awake():
Physics.gravity = Vector3(0, -1.0F, 0)