Quaternion.LookRotation in 2D

Hey there,

I made a quick prototype of my game with cubes in 2D where a cube would rotate to face mouse click/ touch. However now that I want to build it in 2d it no longer works as the item to rotates in 3D. How can I fix it so that it only rotates in 2D?

Here are the code snippets:

Note: I am using Input.Touches plugin.

This is how I detect the touch

Code (CSharp):

1. void OnMultiTap(Tap tap){
2.  
3.         Debug.Log ("Tap");
4.  
5.         //do a raycast base on the position of the tap
6.         //Your custom code;
7.         Ray ray = Camera.main.ScreenPointToRay (tap.pos);
8.         RaycastHit hit;
9.        
10.         if (tapArea.collider.Raycast (ray, out hit, Mathf.Infinity))
11.         {
12.             indicator.position = hit.point;
13.         }
14.     }

and this is how I am rotating the object to face the touch. Which worked in 3d but not 2d

Code (CSharp):

1.         Quaternion targetRotation = Quaternion.LookRotation (indicator.transform.position - transform.position);
2.  
3.         // Smoothly rotate towards the target point.
4.         transform.rotation = Quaternion.Slerp (transform.rotation, targetRotation, smoothTime * Time.deltaTime);

 

Here ya go!

Code (CSharp):

1.     protected void LookAt(Vector2 point){
2.  
3.         float angle = AngleBetweenPoints(transform.position, point);
4.         var targetRotation = Quaternion.Euler (new Vector3(0f,0f,angle));
5.         transform.rotation = Quaternion.Slerp (transform.rotation, targetRotation, time.deltaTime);
6.  
7.     }
8.     float AngleBetweenPoints(Vector2 a, Vector2 b) {
9.         return Mathf.Atan2(a.y - b.y, a.x - b.x) * Mathf.Rad2Deg;
10.     }

 

Or just continue using lookRotation, with your vector as the up parameter, and (probably) Vector3.forward as the forward param
http://docs.unity3d.com/ScriptReference/Quaternion.LookRotation.html

 

Thanks guys. What I did was clamp the z axis and put the objects under an empty gameobject that was rotated 90 degrees. I will try both the above methods to see which I prefer.

Thanks

 

Excellent job BenZed! I used your 7 years old script for labels on a 2D canvas orbit, which "look" at POIs on a rotatable sphere and connect with a line renderer.

Thanks a lot!