void Enemy::Update(float timestep)
{
	//makes sure that the enemy is always looking at the player

	Vector3 vector_diff = (lookatPlayer->GetPosition() - m_position); //calculate the vector in the direction of the player from the enemy
	vector_diff.Normalize();										  //calculate the unit vector in that direction
	float rotation = acos(vector_diff.Dot(Vector3(0, 0, 1)));         //find the angle of rotation needed using cosine
	Vector3 cross = vector_diff.Cross(Vector3(0, 0, 1));

	if (cross.y > 0) {
		m_rotY = -rotation;
	}
	else if (cross.y <= 0)
	{
		m_rotY = rotation;
	}
}