Aiming object towards touch position with rigidbody on mobile.

Hey, I was wondering if there is a way to rotate an object to aim at your touch position on a phone while using rigidbody rotation physics? I have been able to do it with transform.right but it is causing issues with the movements I am using a rigidbody for.

if (Input.touches.Length > 0) {
Vector3 touchPosition = Input.GetTouch (0).position;
Vector3 dir = GetWorldPositionOnPlane (touchPosition) - transform.position;
transform.right = dir;
}


public Vector3 GetWorldPositionOnPlane(Vector3 screenPosition) {
Ray ray = Camera.main.ScreenPointToRay (screenPosition);
Plane xy = new Plane (Vector3.forward, new Vector3 (1,0, 0));
float distance;
xy.Raycast (ray, out distance);
return ray.GetPoint (distance);
}

Basically how can I make this work with rigidbody rotation?

 

You can probably use a combination of RotateTowards, and Rigidbody.MoveRotation. Here's an excerpt of some code I use to align a rigidbody with an arbitrary vector (`desiredVector` in the code). You can probably use something similar, where you set desiredVector to the aim you want. This code goes in FixedUpdate.

Code (CSharp):

1.  
2.             var angleBetween = Vector3.Angle(this.transform.up, desiredVector);
3.  
4.             if (angleBetween > 0.01f)
5.             {
6.                 // Rotate closer to the desired angle.
7.  
8.                 var desiredRot = Quaternion.FromToRotation(this.transform.up, desiredVector);
9.    
10.                 var maxNumberOfDegrees = Mathf.Min(20, 10 * Time.fixedDeltaTime * Mathf.Max(2, angleBetween / 2));
11.  
12.                 var rotateTo = Quaternion.RotateTowards(_rigidbody.rotation,
13.                     desiredRot * _rigidbody.rotation,
14.                     maxNumberOfDegrees);
15.  
16.                 _rigidbody.MoveRotation(rotateTo);
17.             }
18.  

 

Instead of ScreenToPointRay have you tried using ScreenToWorldPoint? That should hopefully give you a quick fix