How to find out which object is under a specific pixel

Questions & Answers
1

As simple as it gets:

How to find out which object is under a specific pixel?

For example, something like this:

GameObject ObjectUnderPixel(float x, float y)
{
    // algorithm here
}

I’m guessing it has to do with raycasting, but I am not sure how to position the ray.

Thanks

2

Assuming by ‘pixel’ you mean a screen coordinate, then the code is mainly here: http://unity3d.com/support/documentation/ScriptReference/Physics.Raycast.html?from=Input
Note the object must have Collider on it

var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
var hit : RaycastHit;
if (Physics.Raycast (ray, hit, 100)) {
//    Debug.DrawLine (ray.origin, hit.point);
  var objectHit = hit.collider.gameObject;
}