1

Hello
I need to understand how this is calculate,I have a DamageSystem.js for all type of damage, with inside

  var HEALT = 100;
.....
function FallDamage(Damage :float ){

    HEALT -= Damage;

   HEALT --;
     Debug.Log("I'm falling");
 }

and a send message on FPS Walker

  function FallingDamageAlert (fallDistance : float) {
      FindObjectsOfType(Damage_System);
         if (fallDistance >= 15)
          {
            gameObject.SendMessageUpwards ("FallDamage",4,SendMessageOptions.DontRequireReceiver);
          }

        if (fallDistance >= 20)
         { 
           gameObject.SendMessageUpwards ("FallDamage",19,SendMessageOptions.DontRequireReceiver);
         }
     Debug.Log ("Ouch! Fell " + fallDistance + " units!");  
 }

My questions is, I want remove 5 for fallDistance >= 15 + 20 for fallDistance >= 20, in total 25,
but need write 4 and 19.

Why will be removed 5 health point for if (fallDistance >= 15), and 20 for if (fallDistance >= 20), if I write 4 and 19

hope is understandable and do not did a mess

2

HEALT -= Damage; // is the same as HEALT = HEALT - Damage;
HEALT --; // is the same as HEALT = HEALT -1;

You first subtract the actual damgage from your health then you subtract additional 1.

3

As @zyzyx said, you’re actually applying Damage+1. You could make your code more clear by just subtracting Damage from HEALT, and improve the messaging by using a single SendMessageUpwards (SendMessage functions are a bit slow):

function FallDamage(Damage :float ){
  HEALT -= Damage;
  Debug.Log("I'm falling");
}

// send message:
  ...
  function FallingDamageAlert (fallDistance : float) {
    ...
    if (fallDistance >= 15){   // if fallDistance >= 15...
      var damage: float = 5;   //  assume damage 5... 
      if (fallDistance >= 20){ //  but if it's >= 20...
        damage = 25;           //  change damage to 25
      }                        // apply the specified damage
      gameObject.SendMessageUpwards ("FallDamage", damage, SendMessageOptions.DontRequireReceiver);
      Debug.Log ("Ouch! Fell " + fallDistance + " units!");  
    }
  }