[solved] ScreenPointToRay ( Input.mousePosition ) offset error

Either I am tired and I am missing something tremendously obvious, or there is some form of bug in Unity 2018.2.

My ray from cam.ScreenToViewportPoint ( Input.mousePosition ) don't intersects the point, where expecting to. I got significant offset error. Red cube is only 20 units apart from the camera. and error gets bigger, further you go.

I used this method many times in past. Had no major issues. But now?
See the screenshot, and basics script.
There are no other cameras, or scrips active.
Any thoughts?

Code (CSharp):

1. Camera cam = Camera.main ;
2.         Debug.Log ( "Mouse Pos " + Input.mousePosition ) ;
3.         Debug.Log ( "Mouse Pos : Screen To Vieport " + cam.ScreenToViewportPoint ( Input.mousePosition ) ) ;
4.         Ray ray = cam.ScreenPointToRay ( Input.mousePosition ) ;
5.         Debug.Log ( "Ray " + ray ) ;
6.         Debug.DrawLine ( ray.origin, ray.direction * 100, Color.red ) ;

 

It seems like the same problem that I had, I fixed it by casting a plane and getting the point on that plane, when I get home I can post the code for you to see if it fixes it

 

Thx,
Did you experienced this also in Unity 2018.x?

Edit
Just checked 2018.1.0b13. It has same issue.
Eh can not get back to 2017, as I need ECS.

 

here's a function i have that gets me vector3 of the mouse on the world when its called, try it out

Code (CSharp):

1.     Vector3 getCursorWorldPosition()
2.     {
3.         //finding point in world in cursor position
4.         Plane groundPlane = new Plane(Vector3.up, new Vector3(gameObject.transform.position.x, gameObject.transform.position.y, gameObject.transform.position.z));
5.         Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
6.         float distance;
7.         //simply initializing vector3 point, nothing else, this vector zero does nothing
8.         Vector3 point = Vector3.zero;
9.         if (groundPlane.Raycast(ray, out distance))
10.         {
11.             point = ray.GetPoint(distance);
12.         }
13.  
14.         return point;
15.     }

 

Thx again.

Howeverm this unfortunately is not exactly what I am looking for.
Thing is, I need my ray, to find the objects. In your case, you assume you know plane object position already, before searching for the point intersection on the plane.
Which isn't the case for me. If my ray don't hit the object, then I will never find it.

Which leads to the next point

Code (CSharp):

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

Of which is the source of problem. The output ray in my understanding from ScreenPointToRay is incorrect.
Which puts me back in the square one position.

 

Code (CSharp):

1. Debug.DrawLine ( ray.origin, ray.origin + ray.direction * 100, Color.red );
2. Debug.DrawRay ( ray.origin, ray.direction * 100, Color.red );

 

Oh seriously? I feel so dumb now so much lol
Such obvious, how I missed this out, even used draw ray so many times.
Stupidly (I don't know how) I assumed ray from 0 origin lol.

Thx lot.

 

I know that feeling and now always think twice before debug-drawing a ray.

 

I just got the same problem... And i found this post. Just in case it happens to someone else, my problem was comming from the FOV of the camera (there was a difference between my camera and the Cinemachine)