Transform.LookAt (idea AI bots looking at player and shooting)

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// This complete script can be attached to a camera to make it
// continuously point at another object.

// The target variable shows up as a property in the inspector.
// Drag another object onto it to make the camera look at it.
var target : Transform;

// Rotate the camera every frame so it keeps looking at the target
function Update() {
transform.LookAt(target);
}
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// Point the object at the world origin
transform.LookAt(Vector3.zero);