Unity 为什么在 3d 自上而下的游戏中，玩家无法转向 cursor？ （仅 Y 轴）透视相机/LookAt

Question

The game is made in 3D, and this is the main problem for creating the mechanics of directing the player to the cursor, since it works in 2D.

Here is the player code:

void Update(){
   RaycastHit hit;
   Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
   if (Physics.Raycast(ray, out hit)){
      Vector3 pointToLook = hit.point;
      transform.LookAt(2 * transform.position - pointToLook);
   }
}

If that I use Camera.main.ScreenPointToRay and transform.LookAt, maybe they are not optimal for this task.

Video with an example of the error

Answer 1

I think the main problem is that your pointToLook is below transform.position , as you are raycasting a plane, which is below. So when you use lookAt it directs your object a bit downwards.

Your vector transform.position - pointToLook will look a bit in the direction of the plane, so what you want is to take a part of this vector, that is in the same plane as your gameobject. Your gameobject lies horizontally with transform.up looking exactly at Vector3.Up

So let's make a projection.

Vector3 projection = Vector3.ProjectOnPlane(transform.position - pointToLook, Vector3.up);

The next thing you want is to align your transform.forward (or maybe right , depends on your orientation) to that projection.

transform.forward = projection.normalized

And one more note: don't use Camera.main in Update() , as it uses FindGameObjectWithTag() which is slow. Cache reference to camera at Start()