Find out sprite of an object my raycast hit

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Hi! I asked this question before but it seemed to buggy or something, so I post it here again:

I have a raycast which goes through different objects. They all are one gameobject created from a prefab, but with two different sprites in my sprite renderer. I want to find out, which sprite the object hit by my raycast has on it. What is the best way to do that? :)

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Best Answer

Answer by lunoland · Aug 16, 2016 at 06:25 PM

The raycasting functions return a struct which contains data about what the ray hit. You can use this to access components on the object that was hit, including the sprite. In your script, set up some references to the two sprites you care about:

 public Sprite yourSprite1; // Hook these up in the inspector, or load them from Resources.
 public Sprite yourSprite2;

Then, in whatever method you do your raycasting:

 Ray myRay = /* Code that specifies your ray goes here. */ ;
 RaycastHit[] hits = RaycastAll(myRay);
 
 foreach (RaycastHit hit in hits) {
     SpriteRenderer spriteRenderer = hit.collider.GetComponent<SpriteRenderer>();
     
     if (spriteRenderer != null) {
         if (spriteRenderer.sprite == yourSprite1)
             // Do something.
         else if (spriteRenderer.sprite == yourSprite2)
             // Do something else.
     }
 }

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Tschlompf · Aug 16, 2016 at 08:52 PM 0

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That helped me very much, thank you :D

lunoland Tschlompf · Aug 16, 2016 at 08:56 PM 0

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No problem :) If this was all you needed, be sure to accept the answer so the thread closes.

Tschlompf · Aug 16, 2016 at 09:32 PM 0

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Hi! I got another problem now. When I write this:

Ray2D myRay = new Vector2(transformStone.position.x + 1, transformStone.position.y), Vector2.right;

I get this error: " Cannot implicitly convert type 'UnityEngine.Vector2' to 'UnityEngine.Ray2D' "

I think I am just making this ray wrong, but I can't find any solution.

lunoland Tschlompf · Aug 16, 2016 at 11:46 PM 0

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https://docs.unity3d.com/ScriptReference/Ray2D.html

The syntax is wrong for declaring a Ray2D. You need to declare a new instance of the Ray2D struct and pass in the two Vector2 parameters.

 Ray2D myRay = new Ray2D(new Vector2(transformStone.position.x + 1, transformStone.position.y), Vector2.right);

Tschlompf lunoland · Aug 18, 2016 at 07:49 AM 0

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Hi! Thanks for your answer. When I write it like this:

Ray2D myRay = New Ray2D(new Vector2(transformStone.position.x + 1, transformStone.position.y), Vector2.right); RaycastHit2D[] hits = Physics2D.RaycastAll(myRay);

An error says: "No overload for method 'RaycastAll' takes 1 arguments"

So I wrote it like this: RaycastHit2D[] hits = Physics2D.RaycastAll(new Vector2(transformStone.position.x + 1, transformStone.position.y), Vector2.right);

But my script does not work. It isn't showing any error. That's my full script:

using UnityEngine; using System.Collections;

public class RaycastWin : $$anonymous$$onoBehaviour { public Sprite orangeStone;

 // Use this for initialization
 void Start() {
     orangeStone = Resources.Load<Sprite>("OrangenerStein");
     
     
     
     

     
 }

 // Update is called once per frame
 void Update() {
     var transformStone = GetComponent<Transform>();
     RaycastHit2D[] hits = Physics2D.RaycastAll(new Vector2(transformStone.position.x + 1, transformStone.position.y), Vector2.right);

     foreach (RaycastHit2D hit in hits) {
         SpriteRenderer spriteRenderer = hit.collider.GetComponent<SpriteRenderer>();

         if (spriteRenderer != null) {

             if (spriteRenderer.sprite == orangeStone) {
                 Debug.Log("HIT!");
           } else { Debug.Log("NOT!"); }
         }
     }
 }
     
     

 }

I'm attaching that script to my prefab-gameobject. In another script I place it on mouseclick, and then my console says "NOT!", as expected. But when I place another object of that prefab to the right site of the first object, with the orangeStone sprite attached, the console still says "NOT!".

Am I doing something wrong in my script? Thanks in advance :)

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Find out sprite of an object my raycast hit

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