how to move Rigidbody using A and D keys

Unity Engine
1

Hi

How would I go about moving a Rigidbody cube left(key a) or right (key d).

I can see that it will have something to do with AddRelativeForce or AddForce but how to you access the key pressed.

I’m very new to all this :slight_smile: if you could point me in the right direction (info on forum or Unity documents) that you be great :slight_smile:

I found this in the documents - it is OK to use with Rigidbody?

var speed = 10.0;
var rotationSpeed = 100.0;

function Update () {
// Get the horizontal and vertical axis.
// By default they are mapped to the arrow keys.
// The value is in the range -1 to 1
var translation = Input.GetAxis (“Vertical”) * speed;
var rotation = Input.GetAxis (“Horizontal”) * rotationSpeed;

// Make it move 10 meters per second instead of 10 meters per frame…
translation *= Time.deltaTime;
rotation *= Time.deltaTime;

// Move translation along the object’s z-axis
transform.Translate (0, 0, translation);
// Rotate around our y-axis
transform.Rotate (0, rotation, 0);
}

2

You can check for key events via the Input class, specifically either GetKey or GetKeyDown.

Yes, and no. The code you cited would be ok to start with for non-rigidbodies, but not for rigid ones. If you’re going to use rigidbodies then:

  1. Use FixedUpdate, not Update nor LateUpdate.

  2. Use rigidbody.AddForce() to move the object based on key presses.

If you’re not using rigidbodies then:

  1. Feel free to use Update or LateUpdate, but not FixedUpdate.

  2. Use transform.translate to move the object based on key presses.

Hope that helps!

3

Hi HiggyB

Thanks so much for your help and it does help :slight_smile: you rock.