How do I correctly use SendMessage?

Questions & Answers
1

I am trying to create a Boss fight scenario in a topdown shooter in which when the player crosses a boundary, a number of enemies are instantiated, and then when the number of enemies reaches zero, then the boss fight is over.

I am trying to use Unity’s sendmessage things but they aren’t working and I dont know why. I tried to write this in chronological order but it might be a little messed up.
Thanks in advance!

//CrossBoundary Script
   function OnTriggerExit(other : Collider){
    
    //player crosses line
        if (other.gameObject.collider.tag == "Player"){
        SendMessage("BossStart");
        SendMessage("Enemies");

//Sets BossFight to true on enemy script
function BossStart(){

BossFight = true;


}

//death function on enemies
function Death(){

	dead = true;
	Destroy (gameObject);
	Instantiate(EnemyDiesParticles, transform.position, transform.rotation);
	dead = false;
	
	if (dead == true && BossFight == true){
	
		SendMessage("EnemyCounter");
	
	}

	

//"gamemaster"
function Enemies () {

	for (var i = 0; i < BossNumber; i++)
		Instantiate(Enemy, BossSpawn.position, Quaternion.identity);
	enemyCount = BossNumber;
	

}
2

You’re sending message to the gameobject which contains this script. If I understood right - you think that SendMessage sending message to all of the gameobjects in scene, but it’s sending message to all components on gameobject.

3

You are calling the SendMessage() from the CrossBoundary script to the same script itself.You should call the SendMessage() from the CrossBoundary script to the enemy script.

//CrossBoundary Script
function OnTriggerExit(other : Collider)
{
  //player crosses line
  if (other.gameObject.collider.tag == "Player")
  {
    Enemy.gameObject.SendMessage("BossStart");
    Enemy.gameObject.SendMessage("Enemies");
   }
}

If you are having more than one enemy,use tags to find the eneimes and sendmessage to them.

//CrossBoundary Script

//The array of enemy gameobjects
var Enemies;

function OnTriggerExit(other : Collider)
{
  //player crosses line
   if (other.gameObject.collider.tag == "Player")
   {
      //Get all objects with  tag " Enemy"
      Enemies = GameObject.FindGameObjectsWithTag ("Enemy");

      for (var Enemy in Enemies)
      {
        Enemy.gameObject.SendMessage("BossStart");
        Enemy.gameObject.SendMessage("Enemies");
      }
   }
}