Version: Unity 6 Preview (6000.0)
LanguageEnglish
  • C#

Rigidbody2D.velocity

Suggest a change

Success!

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.

Close

Submission failed

For 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.

Close

Cancel

Switch to Manual
public Vector2 velocity;

Description

Linear velocity of the Rigidbody in units per second.

The velocity is specified as a vector with components in the X and Y directions (there is no Z direction in 2D physics). The value is not usually set directly but rather by using forces. Disable drag in the Inspector to stop the gradual decay of the velocity.

Additional resources: Rigidbody2D.angularVelocity, Rigidbody2D.AddForce and Rigidbody2D.drag.

//Create a new 2D Sprite GameObject and attach this script to it.

//This script moves a GameObject up or down when you press the up or down arrow keys. //The velocity is set to the Vector2() value. Unchanging the Vector2() keeps the //GameObject moving at a constant rate.

using UnityEngine;

public class ExampleClass : MonoBehaviour { private Rigidbody2D rb;

private float t = 0.0f; private bool moving = false;

void Awake() { rb = gameObject.AddComponent<Rigidbody2D>() as Rigidbody2D; rb.bodyType = RigidbodyType2D.Kinematic; }

void Start() { gameObject.GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("image128x128"); gameObject.transform.Translate(0.0f, 0.0f, 0.0f); }

void Update() { //Press the Up arrow key to move the RigidBody upwards if (Input.GetKey(KeyCode.UpArrow)) { rb.velocity = new Vector2(0.0f, 2.0f); moving = true; t = 0.0f; }

//Press the Down arrow key to move the RigidBody downwards if (Input.GetKey(KeyCode.DownArrow)) { rb.velocity = new Vector2(0.0f, -1.0f); moving = true; t = 0.0f; }

if (moving) { // Record the time spent moving up or down. // When this is 1sec then display info t = t + Time.deltaTime; if (t > 1.0f) { Debug.Log(gameObject.transform.position.y + " : " + t); t = 0.0f; } } } }