Add energy (ammo) on collision

Hi.
How do I add 2 energy to private int energy = 10; (with energy --; each shot takes 1 away) each time I hit the target.
I guess it should work with void OnCollisionEnter, but what is the script for adding?
Whatever I was able to pull out of google (++, -+, =+...) didn't work. I feel like I'm close, but...

I don't need anything complicated. Simply if hits, then adds, if doesn't hit, then just take 1 away as it does.

 

The general form to assign a variable is:

Code (csharp):

1. variableName = newValue;

(where newValue can include all sorts of math and functions and such)
So, naturally, you can make newValue be a math formula based on the previous value of the variable:

Code (csharp):

1. variableName = variableName + 2;

As a shortcut, C# provides this operator as well:

Code (csharp):

1. variableName += 2;

 

OK, It doesn't like the

Code (CSharp):

1. void OnCollisionEnter (Collision col)
2.     {
3.         if(col.gameObject.name == "bubble(Clone)")
4.         {
5.             energy += 2;
6.         }
7.     }

for some reason.
When I put energy += 2; after if (Input.GetMouseButtonDown(0)){ it works. Of course it adds energy every time I press mouse.
So why it doesn't work in void OnCollisionEnter? bubble(clone) is the target.

 

Put in two Debug.Log statements, one inside and one outside the "if" block, and see which (if either) gets output to the console. That'll let you see if it's the collision part that's the problem, or the if statement.

 

Hm... yes, I don't get output from either.
May be it is because the void OnCollisionEnter for bubble is in wrong script. I will look in to this and will see if that's the problem.

 

The script must be on the same GameObject as the collider, and both colliders involved must not be triggers. Also, you may need to check your layer collisions (Physics settings - grid of a bunch of checkbox toggles, to be safe make sure all are checked) to make sure the two objects can collide with each other.

 

OK! Success!
Now I did it from actual bubble object script and sent the 'energy += 2' to ProjectileShooter script by using GameObject projectileShooterObject = GameObject.FindWithTag...
Before I was trying to do it in that projectile shooter script, since it is there where energy is reduced when projectile is launched.
I actually tried this before, but then I forgot to Tag the Projectile Shooter. Gave up when it didn't work. Have to be more careful with little details. ^_^

Thanks!