[Make Object Always Face To Camera] Use `LookRotation` to make Object always face to camera #unity #rotation

face-to-camera.cs

// Reference: https://www.cnblogs.com/hejianchun/articles/3108954.html

public class HPBar : MonoBehaviour {
  public GameObject hpBar; // 获取血条信息。
  public GameObject camera; // 获取主摄像机  
  public Vector3 offset; // 血条和人物坐标的差值,也就是血条在人物的上中方...之类的.这样理解
  
  void Update () {
    Vector3 relativePos = transform.position - camera.transform.position;
    Quaternion rotation = Quaternion.LookRotation(relativePos);
    hpBar.transform.rotation = rotation;
  }
}