Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.
CloseFor some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.
CloseThe velocity vector of the rigidbody.
In most cases you should not modify the velocity directly, as this can result in unrealistic behaviour. Don't set the velocity of an object every physics step, this will lead to unrealistic physics simulation. A typical example where you would change the velocity is when jumping in a first person shooter, because you want an immediate change in velocity.
using UnityEngine; using System.Collections;
// The velocity in y is 10 units per second. If the GameObject starts at (0,0,0) then // it will reach (0,100,0) units after 10 seconds.
public class ExampleClass : MonoBehaviour { public Rigidbody rb;
private float t = 0.0f; private bool moving = false;
void Start() { rb = GetComponent<Rigidbody>(); }
void FixedUpdate() { if (Input.GetButtonDown("Jump")) { // the cube is going to move upwards in 10 units per second rb.velocity = new Vector3(0, 10, 0); moving = true; Debug.Log("jump"); }
if (moving) { // when the cube has moved over 1 second report it's position t = t + Time.deltaTime; if (t > 1.0f) { Debug.Log(gameObject.transform.position.y + " : " + t); t = 0.0f; } } } }
Note: A velocity in Unity is units per second. The units are often thought of as metres but could be millimetres or light years. Unity velocity also has the speed in X, Y, and Z defining the direction.
Did you find this page useful? Please give it a rating:
Thanks for rating this page!
What kind of problem would you like to report?
Thanks for letting us know! This page has been marked for review based on your feedback.
If you have time, you can provide more information to help us fix the problem faster.
Provide more information
You've told us this page needs code samples. If you'd like to help us further, you could provide a code sample, or tell us about what kind of code sample you'd like to see:
You've told us there are code samples on this page which don't work. If you know how to fix it, or have something better we could use instead, please let us know:
You've told us there is information missing from this page. Please tell us more about what's missing:
You've told us there is incorrect information on this page. If you know what we should change to make it correct, please tell us:
You've told us this page has unclear or confusing information. Please tell us more about what you found unclear or confusing, or let us know how we could make it clearer:
You've told us there is a spelling or grammar error on this page. Please tell us what's wrong:
You've told us this page has a problem. Please tell us more about what's wrong:
Thanks for helping to make the Unity documentation better!