RaycastHit2D works incomprehensibly

Question

 for(int  = 0; i < allPoints.Count; i++){
 RaycastHit2D raycastHit2D = Physics2D.Raycast(transform.position, allPoints[i].point);
 if (raycastHit2D.collider != null) 
 {
         Debug.DrawRay(transform.position, raycastHit2D.point, Color.red);
         Debug.Log(transform.position+" "+ allPoints[i].point + "  "+ raycastHit2D.point);
 }
 }

log before change transform.position: (0.0, 0.0, -15.2) (17.3, -10.0) (17.3, -10.0) log after change transform.position: (0.0, 8.0, -15.2) (17.3, -2.0) (17.3, 6.0)

For some strange reason, after changing the position of the object, the direction of the Ray2D shifts

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Answer 1

Answer by Captain_Pineapple · Feb 13, 2019 at 11:49 AM

Hey there,

well this can't work since you are confusing positions of your points with directions. You have to subtract all points by your transforms position to get a relative direction. Currently your first ray direction is (17.3, -10.0). After moving it is (17.3, -2.0). -> It does exactly what you tell it to do. Draw a ray in this direction.

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Answer 2

Answer by xxmariofer · Feb 13, 2019 at 11:54 AM

hello, i think your issue is understanding Directions as Points. they are both Vector3 but they are not the same. when you are creating the ray, you are not passing points to the ray but directions. for example if you pass a direction to the ray that is

 new Vector3(1,1);

the ray will go in the angle 45* and will have this angle anyway if the camera is at position (0,0,0) or position (0,8,0). so your issue will be fixed when you dont update the allPoints var, i imagine they are points in the editor so just leave them at the exat value, dont update it with the camera position since they are not points, but directions.

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xxmariofer · Feb 13, 2019 at 11:59 AM 0

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this is the exact same response as @Captain_Pineapple so i leave it for clarification and delete it after your problem is fixed.

Answer 3

Answer by alexseikuzmin85 · Feb 13, 2019 at 12:34 PM

Indeed, I did not quite understand how it works. Now everything fell into place. Thanks!!!

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xxmariofer · Feb 13, 2019 at 12:45 PM 0

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mark captain answer as correct for helpping future readers with the same issue :)

RaycastHit2D works incomprehensibly

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