get contact point returning null

the overlap collider works as intended , however when i try to retrieve the contact points everything returns null. what am i missing?

Code (CSharp):

1. ContactFilter2D contactFilter = new ContactFilter2D();
2.             int layer = 12;
3.             int layermask = 1 << layer;
4.             contactFilter.SetLayerMask(layermask);
5.             contactFilter.useLayerMask = true;
6.             Collider2D[] colliders = new Collider2D[10];
7.             int FFF =  GC.UnitPool[index].MoveRadius.OverlapCollider(contactFilter, colliders);
8.             foreach (Collider2D FF in colliders) {
9.                 if (FF != null) {
10.                     GC.UnitPool[index].Col.Add(FF);
11.                 }
12.         }
13.             //int GetContacts(Collider2D collider, Collider2D[] colliders);
14.             ContactPoint2D[] Contact = new ContactPoint2D[10];
15.             int FFFF = GC.UnitPool[index].MoveRadius.GetContacts(contactFilter,Contact);
16.             foreach (ContactPoint2D SFS in Contact)
17.             {
18.                 Debug.Log(SFS);
19.                 Debug.Log(SFS.point);
20.                 Debug.Log(SFS.collider);
21.                 Debug.Log(SFS.otherCollider);
22.                 Instantiate(GOG, SFS.point , Quaternion.identity , GC.UnitPool[index].transform);
23.             }

 

https://docs.unity3d.com/ScriptReference/Collider2D.GetContacts.html

Rather than iterating over the entire Contact array, you should only iterate over the number of items GetContacts() actually placed in that array, such as:

Code (CSharp):

1. int count = GC.UnitPool[index].MoveRadius.GetContacts(contactFilter,Contact);
2. for(int n=0; n<count; ++n)
3. {
4.     var c = Contact[n];
5.     ...

 

That is useful information, i was confused to why it was cast as a int in the first place, now it makes sense ,. thanks,
i wasn't ever able to get the contact points to work. instead i switched to getting the bounds of the collider, and work perfectly for what i intended.