[Solved] Help on a rotation issue for a Top-Down view?

Hello Devs,

I developing a Top-Down game where there are two different camera modes.

1. Camera follows the Player on a Top-Down view basis.

2. The camera suddenly stops moving and just looks at the player from it's position.

Now there might be a lot of transition between the two modes. During both the modes, I would not like the player not to get away from the screen AND I would like to have a lot of fluidity between those transitions.

On a Top-Down view the most common eulerangles is (90, 0, 0).

CODE SETUP :

• I have a switch case to switch between those two modes, whenever needed.

• Each of the two cases, have two common variable, which is "Target" position/rotation.

• I have two common function for both of the cases, which lerps the postion and rotation from "this.transform"position/rotation to the "Target" position/rotation.

• As the player has to be within screen at all times, I use a funtion `Quaternion.LookRotation(PlayerPosition - this.transform.position);`

CODE :

 void Update ()
 {
     DeltaTime = Time.deltaTime;
     switch (CurrentMode)
     {
     case CameraMode.FollowPlayer :
         TargetPosition = new Vector3(PlayerPosition.x, (PlayerPosition.y + HeightFromTarget), PlayerPosition.z);    
         TargetRotation = RequiredRotation();
         break;
         
     case CameraMode.LookAtPlayer :
         TargetPosition = this.transform.position;
         TargetRotation = RequiredRotation();
         break;
     default:
         break;            
     }
     this.transform.position = Vector3.Lerp(this.transform.position, TargetPosition, DeltaTime/2);
     this.transform.rotation = Quaternion.Lerp(this.transform.rotation, TargetRotation, DeltaTime * 50);
 }
 
 Quaternion RequiredRotation()
 {
     RotationalVector = (PlayerPosition - this.transform.position);
     return Quaternion.LookRotation(RotationalVector);            
 }

PROBLEM:

The rotation seems to work fine, except for the mode where the camera is on the Top-Down view following the player. It gets a little messy as the camera suffers rotation on the Y axis which just confuses and makes things very complicated. I would like to find a solution to that.

SCREENSHOT:

During one frame on Top-Down view :

During another frame on Top-Down View :

During the camera being stationary and looking at the player :

CRITERIA :

• I have to use the common Lerp function which could be found at the end of the Update function.

• I can't manually use the function Quaternion.Euler(90, 0, 0) for Top-Down view.

• The most common need is that, the camera should face the player at all times and not suffer a confusing Y rotation during the Top-Down view.

I would appreciate your help, as always. Thank you.