2D character face another character

Question

So heres what I'm trying to do. I want a 2D object that will look at another 2D object, and when that object passes to the other side of it, it will flip and continue to look at the target so that it never rotates upside down. So if I was putting this code on a 2D characters head they would look up as the target passed over head, but then flip and start looking more downward as it passed by instead of the head rotating upside down.

Answer 1

Best Answer

Answer by robertbu · Mar 22, 2014 at 05:42 PM

Here is a bit of code that does what I believe you want. Setup:

The object must be a sprite or other object that is rendered on both sides
The 'front' of the object needs to be on the right when rotation is (0,0,0)
Select the sprite texture and set the anchor to 'Right'

After attaching your script, select the game object with the script and drag and drop the target object on the 'target' variable in the Inspector.

pragma strict

var target : Transform;

function Update () { var dir = target.position - transform.position;

   var q : Quaternion;
     if (dir.x >=0) {
         q = Quaternion.identity;
     }
     else {
         q = Quaternion.Euler(0,180,0);
         dir.x = -dir.x;
     }
     
     var angle = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg;
     transform.rotation = q * Quaternion.AngleAxis(angle, Vector3.forward); 
 }

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TenTonApe · Mar 22, 2014 at 06:09 PM 0

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Awesome thank you.

Answer 2

Answer by Destran · Mar 22, 2014 at 05:14 PM

Try This:

 var rotationSpeed : float = 5.0f;
 
 functon Start()
 {
     rotationSpeed = 5.0f;
 }
 
 
 function Update()
 {
     FacePlayer();
     // rotate to look at player
     transform.rotation = Quaternion.Slerp(transform.rotation, Quaternion.LookRotation(target.position, transform.positon), rotationSpeed * Time.deltaTime);
 }
 
 
 
 function FacePlayer ()
 {    
 var relativePoint = transform.InverseTransformPoint(target.transform.position);
     if (relativePoint.x < 0.0)
     {
         transform.Rotate(0,180,0);
     }
     else 
     {
         transform.Rotate(0,0,0);
     }
 }

Edit: Looking back at your original question this might not be exactly what you wanted, but if you want something with a different functionality let me know and I'll try to help.

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TenTonApe · Mar 22, 2014 at 05:42 PM 0

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The

 transform.rotation = Quaternion.Slerp(transform.rotation, Quaternion.LookRotation(target.position, transform.positon), rotationSpeed * Time.deltaTime);

Line doesn't work at all, the object points into the Z axis and twitches a bunch.

Destran · Mar 22, 2014 at 05:45 PM 0

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sorry that should be transform.rotation = Quaternion.Slerp(transform.rotation, Quaternion.LookRotation(target.position - transform.positon), rotationSpeed * Time.deltaTime);

But, robertbu posted, and he's almost always perfect so.

TenTonApe · Mar 22, 2014 at 06:09 PM 0

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robertbu was indeed perfect, thanks anyway.

2D character face another character

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