Unity : AI [Navmesh implementation (Part IV)]

NOTE : Even if we talk about IA and NavMesh, I’m take one moment to explain a little thing about collections in programming. Because I have see a lot of people have problems with this logic, (me too at the beginning!) and at the end is more easy than you think.

The point is this : every time we use a collection (Array, List, etc) we have to remember one simple thing : the first element is at 0 INDEX.

Now, .Length or .Count, returns how many elements are in the collection.
It means that if we have an Array of 5 elements,
.Length RETURNS 5, NOT 4.

And in this case, for example, _currentPoint represent the INDEX.

So when we arrive at the end and check if :

_currentPoint == _points.Count,
_currentPoint is 5 BUT _point.Count is 6
and 6 DOES NOT EXIST, because we have only 5 indexs.
And that’s why we have this error -> OUT OF THE BOUND OF THE LIST<>.

To fix this error, we have to check if _currentPoint (index 5) is equal to 5, not 6.
And we know that 5 is 6 - 1

And at the end we move to _currentPoint.



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Matteo Lo Piccolo

Matteo Lo Piccolo


Always in love with programming, even if late (I'm already 39 years old) I decided to follow my dream! We will see how far my passion will take me!