quantum-space-buddies/QSB/ConversationSync/CameraFacingBillboard.cs

using UnityEngine;

namespace QSB.ConversationSync
{
	public class CameraFacingBillboard : MonoBehaviour
	{
		private OWCamera _activeCam;

		private void Awake()
			=> GlobalMessenger<OWCamera>.AddListener("SwitchActiveCamera", OnSwitchActiveCamera);

		private void Start()
		{
			_activeCam = Locator.GetActiveCamera();
			UpdateRotation();
		}

		private void OnDestroy()
			=> GlobalMessenger<OWCamera>.RemoveListener("SwitchActiveCamera", OnSwitchActiveCamera);

		private void OnSwitchActiveCamera(OWCamera activeCamera)
		{
			_activeCam = activeCamera;
			UpdateRotation();
		}

		private void LateUpdate()
			=> UpdateRotation();

		private void UpdateRotation()
			=> transform.LookAt(transform.position + (_activeCam.transform.rotation * Vector3.forward), _activeCam.transform.rotation * Vector3.up);
	}
}