Unity Raycast2d Hitting GameObject That Isn't There?

Unity Engine
,
1

I’m making a 2d checkers game and I’m using raycasts on every tile to see if there is a piece that is forced to move (jump over another piece). I also tried using linecasts but it always gives me the same results. It seems like my raycasts are very inconsistent with which piece to hit. Here is what is does:

7669861--957847--Screenshot (20).png
7669861--957847--Screenshot (20).png1920×1080 332 KB

As you can see, the rays are sometimes hitting and sometimes not hitting tiles. Here is the code:

List<GameObject> ScanForPossibleMoves()
    {
        forcedPieces = new List<GameObject>();

        for (int x = 0; x < 8; x++)
        {
            for (int y = 0; y < 8; y++)
            {
                Ray ray = new Ray(cam.transform.position, new Vector3(x, y) - cam.transform.position);
                RaycastHit2D hit = Physics2D.Raycast(ray.origin, ray.direction, Mathf.Infinity, 1 << LayerMask.NameToLayer("Piece"));

                if (hit)
                {
                    Debug.DrawLine(cam.transform.position, new Vector3(x, y));
                    print(hit.transform.name);
                }
            }
        }
        return forcedPieces;
    }

I also checked all the layers in my game:
7669861--957856--Capture.PNG

7669861--957862--Capture1.PNG

I don’t know why this is going on. I tested with this many times but it has never worked. Does someone know the answer to why this isn’t working?

2

Why are you trying to do 3D raycasts in a 2D physics system? Using that “Ray” thing is also odd, not sure why you’re creating it then extract what you put in.

A 2D physics system only exists in a 2D plane, in Unity this the XY plane.

So just use Physics2D.OverlapPoint(new Vector2(x, y)) or if you need to check to see what’s between two points then use Physics2D.Linecast and pass both points.

3

Thanks so much I didn’t know OverlapPoint existed! It’s hitting the piece perfectly now!

7672387--958417--Solved.PNG
7672387--958417--Solved.PNG1190×924 133 KB

4

Glad you got it working. Always worth grabbing a drink and just browsing/testing the Physics2D namespace; lots of useful stuff available there.