Rigidbody2D Force Problem

[Ekta-Mehta-D]

Hello everyone…

I am making sample game like “no brakes”. Here is Video Link : NO BRAKES (iPhone Gameplay Video) - YouTube . 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,…

[zharik86]

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.