Question How to detecting overlapping polygon2D colliders?

I'm trying to program an isometric building placement script. Each building has a PolygonCollider2D component on it with a trigger. When placing a new building, I'm trying to check if the PolygonCollider2D of the placed building overlaps with anything else (to check if placement is valid). My code is as follows:

Adjust the points of the new placed building collider based on the mouse position

Code (CSharp):

1. Vector2[] points = polygonCollider2D.points;
2. points.SetValue(polygonCollider2D.points[0] + (Vector2)mousePosition, 0);
3. points.SetValue(polygonCollider2D.points[1] + (Vector2)mousePosition, 1);
4. points.SetValue(polygonCollider2D.points[2] + (Vector2)mousePosition, 2);
5. points.SetValue(polygonCollider2D.points[3] + (Vector2)mousePosition, 3);
6. polygonCollider2D.points = points;

Set up contact filter:

Code (CSharp):

1. ContactFilter2D contactFilter2D = new ContactFilter2D();
2. contactFilter2D.useTriggers = true;
3. contactFilter2D.SetLayerMask(polygonCollider2D.gameObject.layer);

Check for collisions

Code (CSharp):

1. List<Collider2D> list = new List<Collider2D>();
2. Debug.Log(polygonCollider2D.OverlapCollider(contactFilter2D, list));

However if there is already a building there, it still does not register an overlap. What am I missing / doing wrong ?

Thanks so much for the help!

 

Hello

 

anyone? please help

 

Stop being so rushy, someone who knows the answer will come and help, gotta be patient my guy