Question by Neurus_Ex · Aug 01, 2020 at 04:50 PM · rotation lookat screentoworldpoint look

GameObject rotates away from camera when using ScreenToWorldPoint

I got a simple 3D Game Object (A cube transformed in the shape of a rectangle) with an equally simple script to (in theory) make it look at the position the mouse is.

Now, the hierarchy I have is as follows:

 Empty GameObject.
  |- Object that should rotate.
  |      \- Script that handles the "lookAt"
  \- Main Camera

The main camera is slightly above the object that should rotate, looking down.

The (important part of the) code is as follows:

 public void Start() {
     _mainCamera = Camera.main;
 }

 public void Update() {
     Vector3 positionOnWorld = _mainCamera.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, _mainCamera.nearClipPlane));            
     Vector3 lookingAt = new Vector3(positionOnWorld.x, 12f, positionOnWorld.z);
        
     transform.LookAt(lookingAt);
 }

Main camera's clipping planes are at 0.3 and 1000.

And when I run the scene, the Y rotation gets flipped (On the left, before running, on the right, while running):

halp

Now, the weird part is that this issue seems to happen only with this particular object, as I created a different one following the same structure and it seems to go smooth. The problematic gameobject is not rotated in any way (and is not getting rotated anywhere) and the code works, as the "test" gameObject is using exactly the same lines.

Am I missing something here?

wtf.jpg (32.3 kB)

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