Rotate an object to target

Hi, I'm using this known code to make the enemies follow the target (Player):

void RotateToTarget() {
Vector3 direction = target.position - transform.position;
direction.y = 0;

if (direction.magnitude < 0.1f)
return;

transform.rotation = Quaternion.Slerp (transform.rotation, Quaternion.LookRotation(direction), rotationSpeed * Time.deltaTime);
}

The problem is my game scenary is spherical, it is a planet and when the player and the enemy are on the bottom part of the planet, the enemy turns upside down. On a normal plane scenery it works well.
I have checked this behaviour is due the RotateToTarget method used, so I need to find another method to orient the enemy towards the target. (I'm afraid I am very bad in math..)

Any idea?

 

Quaternion.LookRotation assumes that the up vector is Vector3.up (y+). You'll need to pass in your agent's up vector. I can't tell you exactly how to get that, since it depends on how your geometry is structured, but I suspect your up vector will generally be the agent's position - planet center.

 

SOLVED: I had to add "transform.up" as the second parameter in LookRotation.
Thanks.