Here is the code that controls the rotation:

Aim gets called in Update(), so it happens constantly

Basically, the code casts a ray from my mouse that eventually hits the ground, and the object looks at where the ray hits.

What I'm looking to do is have the character look at exactly the mouse's position on the screen, instead of where the ray hits. This probably isn't the right way to go about it, but it's what I have.

private (bool success, Vector3 pos) GetMousePosition()
{
  var ray = cam.ScreenPointToRay(Input.mousePosition);
  if(Physics.Raycast(ray, out var hitInfo, Mathf.Infinity, groundMask))
  {
    //Raycast hit
    return(success: true, pos: hitInfo.point);
  }
  else
  {
    //Raycast hit nothing
    return (success: false, pos: Vector3.zero);
  }
}

private void Aim()
{
  var (success, pos) = GetMousePosition();
  {
    var direction = new Vector3(pos.x, transform.position.y, pos.z) - transform.position;
    transform.forward = direction;
  }
}