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Rigidbody.useGravity

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public bool useGravity;

Description

Controls whether gravity affects this rigidbody.

If set to false the rigidbody will behave as in outer space.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { public Collider coll;

void Start() { coll = GetComponent<Collider>(); coll.isTrigger = true; }

// Disables gravity on all rigidbodies entering this collider. void OnTriggerEnter(Collider other) { if (other.attachedRigidbody) other.attachedRigidbody.useGravity = false; } }