Raycast on a 2D Collider

Question

I want to raycast from the camera to the mouse location for my @D Game to identify which Object was clicked.

     Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

     RaycastHit hit;
     if(Physics.Raycast(ray,out hit))
     {
         isHit = false;
         Destroy(GameObject.Find(hit.collider.gameObject.name));

     }

Raycasting on 2D Colliders doesn't seem to work.

Answer 1

Best Answer

Answer by robertbu · Dec 14, 2013 at 08:12 PM

As you have found, 3D Raycasting (Physics.Raycast()) on a 2D colliders does not work. You have a couple of choices. First Monobehaviour.OnMouse* functions do work, so you can put a script directly on the object. If you want to Raycast(), then an alternate solution is to put a 3D collider on an empty child game object and size the collider as appropriate to your sprite. You can use the Transform.parent to access the sprite.

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bsbimalbose · Dec 15, 2013 at 03:08 PM 0

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Thanks I added 3D colliders as childern to the Sprite Objects and it works fine

robertbu · Feb 15, 2014 at 10:24 PM 4

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Note my answer here is old and while workable, is not the best answer. The Physics2D.Raycast() using a Vector2.zero for direction works fine. In addition, while I've not seen it in an answer, Physics2D.OverlapPoint() might even be cleaner.

M0no robertbu · Aug 05, 2016 at 02:51 PM 2

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please edit your answer above to include this info

AntFitch · Feb 16, 2014 at 12:40 AM 0

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This is a nice snippet if Physics2D.OverlapPointAll() is used: http://forum.unity3d.com/threads/211708-Unity-2D-Raycast-from-mouse-to-screen

luniac · Nov 06, 2014 at 03:05 PM 0

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Is overlap point possibly cleaner than this? as long as ur looking for the first touch that is.

 var worldTouch = Camera.main.ScreenToWorldPoint(touch.Position);
 var hit : RaycastHit2D;
 hit = Physics2D.Raycast (Vector2(worldTouch.x,worldTouch.y),Vector2.zero, Mathf.Infinity);

ProbePLayer · Feb 05, 2018 at 10:02 PM 0

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There is a third solution which is by far the most accurate for the question, and it is described in the @sushanta1991 's answer. Namely, you use Physics2D.Raycast function but with a twist. You raycast from the mouse position to the mouse position, which gives you any object under the mouse position :)

Answer 2

Answer by MarcosLC · Dec 14, 2013 at 06:49 PM

For 2D Colliders you need use Physics2D and RaycastHit2D instead of Physics.

 void Update(){
         
         RaycastHit2D hit = Physics2D.Raycast(cameraPosition, mousePosition, distance (optional));
         
         if(hit != null && hit.collider != null){
             isHit = false;
             Destroy(GameObject.Find(hit.collider.gameObject.name));
         }
     }

Use it with a Vector2 mousePosition or if your game is 3D use 3D colliders instead of 2D.

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AntFitch · Feb 15, 2014 at 10:20 PM 6

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To clarify:

 Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
 RaycastHit2D hit = Physics2D.Raycast(ray.origin, ray.direction);

Answer 3

Answer by sushanta1991 · Jan 01, 2015 at 11:46 AM

You can try this solution given in this link

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cmos · Mar 15, 2016 at 08:26 PM 1

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This is the only solution that worked for me in this thread.

cmos cmos · Mar 15, 2016 at 08:28 PM 3

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         Vector3 mousePos = Input.mousePosition;
         mousePos.z = 10;
 
         Vector3 screenPos = Camera.main.ScreenToWorldPoint(mousePos);
 
         RaycastHit2D hit = Physics2D.Raycast(screenPos,Vector2.zero);
 
         if(hit)
         {
             print (hit.collider.name);
         }

ProbePLayer · Feb 05, 2018 at 10:03 PM 0

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Yes this answer is clearly the best here.

Answer 4

Answer by _MGB_ · Dec 14, 2013 at 05:55 PM

If you're using the new 2d stuff you'll need to use the Physics2D functions.

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Answer 5

Answer by It3ration · Aug 19, 2014 at 09:36 PM

Use the following to cast 3D rays against 2D colliders:

 Physics2D.GetRayIntersection(...)
 Physics2D.GetRayIntersectionAll(...)

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Utoxin · Mar 02, 2018 at 03:09 PM 0

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This is the most useful answer here. It allows you to use 3D raycasts from the camera to check for 2D colliders. Very helpful!

sandolkakos · Aug 23, 2018 at 07:59 PM 0

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I didn't know about this. Thank you so much, @It3ration . Now I can get Collider2D from Cameras with Perspective projection.

Raycast on a 2D Collider

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