Hovering Text

//****** Donations are greatly appreciated.  ******
//****** You can donate directly to Jesse through paypal at  https://www.paypal.me/JEtzler   ******

var target : Transform;     // Object that this label should follow
var offset = Vector3.up;    // Units in world space to offset; 1 unit above object by default
var clampToScreen = false;  // If true, label will be visible even if object is off screen
var clampBorderSize = .05;  // How much viewport space to leave at the borders when a label is being clamped
var useMainCamera = true;   // Use the camera tagged MainCamera
var cameraToUse : Camera;   // Only use this if useMainCamera is false
private var cam : Camera;
private var thisTransform : Transform;
private var camTransform : Transform;

function Start () {
    thisTransform = transform;
    if (useMainCamera)
        cam = Camera.main;
    else
        cam = cameraToUse;
    camTransform = cam.transform;
}

function Update () {
    if (clampToScreen) {
        var relativePosition = camTransform.InverseTransformPoint(target.position);
        relativePosition.z = Mathf.Max(relativePosition.z, 1.0);
        thisTransform.position = cam.WorldToViewportPoint(camTransform.TransformPoint(relativePosition + offset));
        thisTransform.position = Vector3(Mathf.Clamp(thisTransform.position.x, clampBorderSize, 1.0-clampBorderSize),
                                         Mathf.Clamp(thisTransform.position.y, clampBorderSize, 1.0-clampBorderSize),
                                         thisTransform.position.z);
    }
    else {
        thisTransform.position = cam.WorldToViewportPoint(target.position + offset);
    }
}

@script RequireComponent(GUIText)