Easy way to add a floating icon on a game object?

I have a game object (imagine a totem), and would like to have a floating image, that show the state of the totem (like sleeping, charging, releasing and so on).

I did try to solve this, creating a quad, parenting it to the game object, and then add as texture, an icon image (imported as texture with alpha). The result though is that the image is visible; using the unlit transparent shader, but when I rotate the camera, it disappear.

This is expected, since a quad has the normal and if you don't point to it, you won't see it. How do you make the quad to rotate, so it is always facing the camera?

 

Code (CSharp):

1.  
2. public Transform cameraTransform
3.  
4. void Update(){
5.      transform.LookAt(cameraTransform);
6. }
7.  

Posting this for future reference. Just throw that into some script on the object you want facing the camera, and drop the camera into the cameraTransform variable in the inspector.

 

Also you could make a screen overlay:

Code (CSharp):

1. void ShowIndicator()
2.     {
3.         // Final position of marker above GO in world space
4.         Vector3 offsetPos = new Vector3(hit.transform.position.x, hit.transform.position.y, hit.transform.position.z);
5.         // Calculate *screen* position (note, not a canvas/recttransform position)
6.         Vector2 canvasPos;
7.         Vector2 screenPoint = MyCam.WorldToScreenPoint(offsetPos);
8.         // Convert screen position to Canvas / RectTransform space <- leave camera null if Screen Space Overlay
9.         RectTransformUtility.ScreenPointToLocalPointInRectangle(canvasRect, screenPoint, null, out canvasPos);
10.         IndicatorImage.SetActive(true);
11.         IndicatorImage.transform.localPosition = canvasPos + IndicatorImageOffset;
12.         IndicatorImage.GetComponent<IndicatorImageController>().CurrentObjectSelected = hit.transform;
13.     }

Since with transform.LookAt you won't see the icon if it's blocked by something. But that might be something you want.