1.控制朝向transform.LookAt(target.transform);

2.实现跟随，逐渐靠近

GameObject player;
float MAX_MOVE_DISTANCE=500.0f;
 
void FixedUpdate()
{
     float moveDistance=MAX_MOVE_DISTANCE*Time.deltaTime;
     Vector3 source=transform.position;
     Vector3 target=player.transform.position;
     Vector3 seekVelocity=Seek(source,target,moveDistance);
    seekVelocity=UsefulFunctions.ClampMagnitude(seekVelocity,moveDistance);
     rigidbody.AddForce(seekVelocity,ForceMode.VelocityChange)
}
 
Vector3 Seek(Vector3 source,Vector3 target,float moveDistance)
{
        Vector3 directionToTarget=Vector3.Normalize(target-source);
        Vector3  VelocityToTarget=moveDistance*directionToTarget;
        transform.LookAt(player.transform);
        return velocityToTarget-rigidbody.velocity;  //注意，这里是向量相减
}