FaceCamera.cs

// Useful for Text Meshes that should face the camera.
//
// In some cases there seems to be a Unity bug where the text meshes end up in
// weird positions if it's not positioned at (0,0,0). In that case simply put it
// into an empty GameObject and use that empty GameObject for positioning.
using UnityEngine;

namespace uMMORPG
{
    public class FaceCamera : MonoBehaviour
    {
        // Camera.main calls FindObjectWithTag each time. cache it!
        Transform cam;

        void Awake()
        {
            // find main camera
            cam = Camera.main.transform;

            // disable by default until visible
            enabled = false;
        }

        // LateUpdate so that all camera updates are finished.
        void LateUpdate()
        {
            transform.forward = cam.forward;
        }

        // copying transform.forward is relatively expensive and slows things down
        // for large amounts of entities, so we only want to do it while the mesh
        // is actually visible
        void OnBecameVisible() { enabled = true; }
        void OnBecameInvisible() { enabled = false; }
    }
}