Flock.cs

//Code de base tu tuto: 

void Update()
{
    foreach (FlockAgent agent in agents)
    {
        List<Transform> context = GetNearbyObjects(agent);

        //FOR DEMO ONLY
        //agent.GetComponentInChildren<SpriteRenderer>().color = Color.Lerp(Color.white, Color.red, context.Count / 6f);

        Vector2 move = behavior.CalculateMove(agent, context, this);
        move *= driveFactor;
        if (move.sqrMagnitude > squareMaxSpeed)
        {
            move = move.normalized * maxSpeed;
        }
        agent.Move(move);
    }
}

List<Transform> GetNearbyObjects(FlockAgent agent)
{
    List<Transform> context = new List<Transform>();
    Collider2D[] contextColliders = Physics2D.OverlapCircleAll(agent.transform.position, neighborRadius);
    foreach (Collider2D c in contextColliders)
    {
        if (c != agent.AgentCollider)
        {
            context.Add(c.transform);
        }
    }
    return context;
}


//avec mes changements

void Update()
{
  foreach (FlockAgent agent in agents)
  {        
    List<Transform> context = GetNearbyObjects(agent);
    Vector3 move = behavior.CalculateMove(agent, context, this);
    move *= driveFactor;

    if (move.sqrMagnitude > squareMaxSpeed)
    {
        move = move.normalized * maxSpeed;
    }

    agent.Move(move);
  }
}

List<Transform> GetNearbyObjects(FlockAgent agent)
{
  List<Transform> context = new List<Transform>();

  foreach (FlockAgent item in agents)
  {
    if (item != agent)
    {
      Vector3 heading = item.AgentPosition - agent.AgentPosition;

      if (heading.sqrMagnitude < squareNeighborRadius)
      {
          context.Add(item.AgentTransform);
      }
    }
  }

  return context;
}