c# - How do I get all overlapped Collider2D on any layer in LayerMask array

Question

I need to choose all elements in the array

public LayerMask[] ground;

I have a problem "Wrong number of indices inside []; expected 1", with:

a = Physics2D.OverlapCircle(bottom.position, radius, ground[0, ground.Length]);

Answer 1

Use the logical OR | operator to combine the masks then do one OverlapCircle with that combined mask, and then you can call the override of OverlapCircle that will give you multiple results. You'll have to create a ContactFilter2D to do so:

// Initialize the results list once and keep it around to avoid unnecessary 
// garbage collection
List<Collider2D> overlapResults;

void Awake()
{
    overlapResults = new List<Collider2D>(); 
}

// ... in the method in question...

int allMask = 0; 
foreach (LayerMask lm in ground) 
{ 
    allMask = allMask | lm.value; 
} 
ContactFilter2D filter = new ContactFilter2D();
filter.SetLayerMask(allMask);

Physics2D.OverlapCircle(bottom.position, radius, filter, overlapResults);
for (Collider2D overlapResult in overlapResults) 
{
    // do stuff with overlapResult
}