Rigidbody2D Force Problem

Question

Hello everyone..

I am making sample game like "no brakes". Here is Video Link : http://www.youtube.com/watch?v=Lb2sQJfqZnE . I have done coding for moving player.

Code :

      void Update () {
         if(ON)
         {
             rigidbody2D.drag = 1.2f;
             rigidbody2D.angularDrag = 0.05f;
             speedTxt.text = velocity.ToString ();
             SpeedControl();
             Movement();
         }
     }
 
     void Movement()
     {
         rigidbody2D.AddForce (transform.up * speed );
         velocity = Mathf.Round (rigidbody2D.velocity.magnitude * 10.6f);
 
         if(Input.GetMouseButton(0))
         {
             Vector3 inputPos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             inputPos.z = 0;
             RaycastHit2D hit;
             hit = Physics2D.Raycast( inputPos,new Vector2( 0,0 ) );
 
             if(hit.collider.name == "Left")
             {
                 Debug.Log("left.. ");    
                 yRotation += 3.0f ;
 
                 Quaternion target = Quaternion.Euler(0, 0, yRotation);
                 transform.rotation = Quaternion.Slerp(transform.rotation, target, Time.deltaTime * 10.0f);
 
                 rigidbody2D.AddForce(-transform.right * speed * 1.1f );
                 //rigidbody2D.AddForce (transform.up * 1.2f );
                 rigidbody2D.drag += 0.1f;
                 //rigidbody2D.angularDrag += 0.5f;
             }
             
             if(hit.collider.name == "Right")
             {
                 Debug.Log("Right.. ");    
                 yRotation -= 3.0f ;
 
                 Quaternion target = Quaternion.Euler(0, 0, yRotation);
                 transform.rotation = Quaternion.Slerp(transform.rotation, target, Time.deltaTime * 10.0f);
 
                 rigidbody2D.AddForce(transform.right * speed * 1.1f );
                 //rigidbody2D.AddForce (transform.up * 1.2f );
                 rigidbody2D.drag += 0.1f;
                 //rigidbody2D.angularDrag += 0.5f;
             }
         }
     }

All this i have did in 2d scene.

In this code issue is while moving left and right.. its not going smoothly like it should go forward also and should turn also. I want exact behavior like in this video.

I am trying from last two days but i am not able to solve this.

Please anyone help me.

Thanks,..

[1]: http://www.youtube.com/watch?v=Lb2sQJfqZnE

Answer 1

First, your angle, yRotation is equal to 3 degrees. It is difficult to see such deviation on a scene. Reject your object of degrees on 20. Also set the speed of change of a deviation, for example, 5. The second, in your script I don't see resetting to an original status of rotation in case of release of the button. I will a little rewrite your script as I represent it:

  public float speedRot = 5.0f; //add one more variable for speed of rotation. For change value, change it in Inspector.

  void Start() {
   //Maybe, initialization your rigidbody here
   
  }

  void Update () {
   if(ON) {
    rigidbody2D.drag = 1.2f;
    rigidbody2D.angularDrag = 0.05f;
    speedTxt.text = velocity.ToString ();
    SpeedControl();
    Movement();
   }
  }

  void Movement() {
   rigidbody2D.AddForce (transform.up * speed );
   velocity = Mathf.Round (rigidbody2D.velocity.magnitude * 10.6f);

   if(Input.GetMouseButton(0)) {
    Vector3 inputPos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
    inputPos.z = 0;
    RaycastHit2D hit;
    hit = Physics2D.Raycast( inputPos,new Vector2( 0,0 ) );

    if(hit.collider.name == "Left") {
     Debug.Log("left.. ");   
     yRotation += 20.0f; //change angle to 20 degree

     Quaternion target = Quaternion.Euler(0, 0, yRotation);
     //Apply our variable speedRot
     transform.rotation = Quaternion.Slerp(transform.rotation, target, Time.deltaTime * speedRot);

     rigidbody2D.AddForce(-transform.right * speed * 1.1f );
     //rigidbody2D.AddForce (transform.up * 1.2f );
     rigidbody2D.drag += 0.1f; //Why change, you reinitialization your rigidbody in Update every frame. Isn't necessary.
     //rigidbody2D.angularDrag += 0.5f;
    }

    if(hit.collider.name == "Right") {
     Debug.Log("Right.. ");  
     yRotation -= 20.0f;

     Quaternion target = Quaternion.Euler(0, 0, yRotation);
     transform.rotation = Quaternion.Slerp(transform.rotation, target, Time.deltaTime * speedRot);

     rigidbody2D.AddForce(transform.right * speed * 1.1f );
     //rigidbody2D.AddForce (transform.up * 1.2f );
     rigidbody2D.drag += 0.1f;
     //rigidbody2D.angularDrag += 0.5f;
    }
   }
  }

I hope that it will help you.

Rigidbody2D Force Problem

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