LookAt 2D Equivalent ?

Question

Is there a Transform.LookAt() Equivalent that will work for 2D ?

Without turning the gameobject on it's side that is...

Or alternatively does anyone have a workaround using Eulers or something ?

Thanks in advance :)

:

edit : Solution

 Quaternion rotation = Quaternion.LookRotation
             (Target.transform.position - transform.position, transform.TransformDirection(Vector3.up));
         transform.rotation = new Quaternion(0, 0, rotation.z, rotation.w);

Seams to work for what i am trying to achieve but please if anyone comes up with a better solution let me know.

Answer 1

Best Answer

Answer by daivd.ramz · Feb 11, 2014 at 04:40 PM

hi guys i have same problem and this is work very nice for me :)

         Vector3 diff = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position;
         diff.Normalize();
 
         float rot_z = Mathf.Atan2(diff.y, diff.x) * Mathf.Rad2Deg;
         transform.rotation = Quaternion.Euler(0f, 0f, rot_z - 90);

i hope this work for you :)

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sandworm55 · Mar 03, 2015 at 05:28 AM 0

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this isn't working for me, the sprite i'm having turn is moving and the farther it gets from the center the more uncontrollable it is, and the rotations seem to be reversed, up and down at right, but left and right are flipped. the only difference is my diff is the target - transform.postion where target is a vector3 of the object i'm trying to chase

deserdoo sandworm55 · Dec 15, 2019 at 07:39 PM 0

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Easier to use @abar 's function

LazyKnight · Jun 14, 2018 at 12:03 AM 4

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Do not forget to view the answer at the bottom provided by @abar, if you need a simpler way.

Answer 2

Answer by abar · Feb 12, 2016 at 05:25 PM

Surely the simplest solution is:

 transform.right = target.position - transform.position;

Maybe that hasn't always been possible, but it sure beats messing about with Atan2.

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Burkentain · Sep 02, 2016 at 06:15 PM 2

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This made my day, why isn´t this the accepted answer??? Thank you so much!

nikocr33nzz · Nov 22, 2016 at 09:13 AM 0

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this code helped me half way. this code make the gameobject rotation to the target. but how can i make it move to the target?

gonchostone nikocr33nzz · Sep 21, 2017 at 08:04 PM 0

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transform.position = Vector2.$$anonymous$$oveTowards(transform.position, target.transform.position, speed * Time.deltaTime); transform.right = target.position - transform.position;

thudme22 · Jan 12, 2018 at 03:17 AM 2

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It is too genius that I have to login my account and give you a vote!! This is really easy to understand and it makes me able to $$anonymous$$ch my students the 2DLookAt function on my lesson!! Thanks a lot!!

Johan-Ed · Mar 19, 2018 at 02:31 PM 7

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Great solution! Also, if you (like me) want the turning of the object to be gradual you can use Lerp or Slerp like this:

transform.up= Vector3.Lerp(transform.up, (target.position - transform.position), turnRate);

LazyKnight · Jun 14, 2018 at 12:04 AM 5

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Great answer!

As an additional hint: if you use unity 2d view, please use transform.up than transform.right.

nanodeath LazyKnight · Jun 02, 2019 at 07:10 PM 1

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This depends on which way "forward" is for you. If forward is to the right, as is convention, then transform.right is still correct.

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Answer 3

Answer by robertbu · Feb 05, 2014 at 05:14 PM

Given the right side of your sprite as the forward, and having a 'target' as a Transform (your code has it as a game object), you can do it this way:

 Vector3 dir = target.position - transform.position;
 float angle = Mathf.Atan2(dir.y,dir.x) * Mathf.Rad2Deg;
 transform.rotation = Quaternion.AngleAxis(angle, Vector3.forward);

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stfilip · Jul 10, 2014 at 11:18 AM 0

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I know it is a bit late, but is it possible to make sprite rotate for a certain degree? I am using On$$anonymous$$ouseDrag(), and I don't want it to juse follow mouse, but to skip 15 degrees.

F-N · Jun 20, 2016 at 02:11 PM 2

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I like your solution for it's simplicity and in this way you don't have to use .Normalize. What I did to make this piece of code result in a sprite really pointing forward to the target was simply to increase the angle with 270f. So you get:

             Vector3 dir = target.position - transform.position;
     float angle = $$anonymous$$athf.Atan2(dir.y,dir.x) * $$anonymous$$athf.Rad2Deg + 270;
     transform.rotation = Quaternion.AngleAxis(angle, Vector3.forward);

Answer 4

Answer by mustafa · Feb 05, 2014 at 04:53 PM

 // LookAt 2D
 Vector3 target;
 // get the angle
 Vector3 norTar = (target-transform.position).normalized;
 float angle = Mathf.Atan2(norTar.y,norTar.x)*Mathf.Rad2Deg;
 // rotate to angle
 Quaternion rotation = new Quaternion ();
 rotation.eulerAngles = new Vector3(0,0,angle-90);
 transform.rotation = rotation;

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nventimiglia · May 10, 2015 at 05:45 PM 0

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This solution worked for my relative aim assist script.

NikitaDemidov · May 11, 2019 at 01:09 PM 0

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Thank You!!!!!!! I went crazy because of my enemies didn't follow the Player. They disappeared!
Then I saw that Transform.LookAt (...) caused the bug and now I know how to fix it. Thanks!!

Answer 5

Answer by YoungDeveloper · Nov 27, 2013 at 07:35 PM

You could use vector2, it have only x and y coordinates.

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LEDWORKS · Nov 27, 2013 at 07:43 PM 0

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Na, No Luck, just tried...

 Vector2 LookAtPoint = new Vector2(Target.transform.position.x, Target.transform.position.y);
         transform.LookAt(LookAtPoint);

Is This what you mean?

Paparakas · Nov 27, 2013 at 11:53 PM 0

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@LEDWOR$$anonymous$$S

That works fine for me. $$anonymous$$ake sure to keep your plane in $$anonymous$$d. If you're working with the XY plane then that should work fine, but if you're working on the ZY plane then you'll have to do

 Vector2 LookAtPoint = new Vector2(Target.transform.position.z, Target.transform.position.y);
 transform.LookAt(new Vector3(0,LookAtPoint.y,LookAtPoint.x);

LookAt 2D Equivalent ?

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