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Question by RCIX · Mar 28, 2010 at 09:26 PM · 2dmovement

Movement Script troubles

I wrote the following script:

using UnityEngine; using System.Collections;

public class NewBehaviourScript : MonoBehaviour { // Use this for initialization void Start () {

 }

 // Update is called once per frame
 void Update () {
     if (Input.GetKey("W"))
     {
         rigidbody.AddForce(new Vector3(0,100), ForceMode.Force);
     }
     if (Input.GetKey("A"))
     {
         rigidbody.AddForce(new Vector3(100,0), ForceMode.Force);
     }
     if (Input.GetKey("S"))
     {
         rigidbody.AddForce(new Vector3(0,-100), ForceMode.Force);
     }
     if (Input.GetKey("D"))
     {
         rigidbody.AddForce(new Vector3(-100,0), ForceMode.Force);
     }
 }

}

As you can see, a basic script which ought to move the object i dropped it on when i press the WASD keys. However, putting it on my object, it doesnt work. Am i doing anything obviously wrong or anything?

My object is a combo plane/BoxCollider with the plane rotated 90 degrees (to face my camera, the Z axis points down now), and it is constrained to 2 dimensions (X and Y).

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Answer by Eric5h5 · Mar 28, 2010 at 10:23 PM

The main problem is that there are no keys called "W", "S" etc.; you should get an error message if you try to use those. The actual names are lowercase ("w", "s", etc.) But instead of hard-coding input (people don't necessarily have QWERTY keyboards), use Input.GetAxis. Also it's better not to hard-code the force since you might need to change that. Using Update without Time.deltaTime will make your code framerate-dependent, but physics should be in FixedUpdate anyway.

public float force = 100;

void FixedUpdate () { rigidbody.AddForce(Input.GetAxis("Horizontal") Vector3.right force); rigidbody.AddForce(Input.GetAxis("Vertical") Vector3.up force); }

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avatar image Lipis · Mar 28, 2010 at 10:33 PM 0
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  • 100% right :) I'll just delete my answer..

avatar image RCIX · Mar 28, 2010 at 10:35 PM 1
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You both provide nice answers but i think this one fits better as it both fixes my problem and points out how i could do things better! thanks!

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