Could someone help me whith my problem? I have a list of points, taken from DWG. Each point is located on a certain layer, have XYZ-coordinates and index number. I need to create a polygon of points on a certain layer. The number of layers is about 400. All what I can do for now is to sort manualy the list of points by the certain layer. And I found the function how to get unique layers from the list of points. But I can’t link them. I think this is a bad idea to create 400 copies of working chain of nodes. And there is anothe problem - if I manualy seting the names of the layers in Dynamo they can be different from the layers in DWG. So that is why I need to sort the list of points by the unique layers and create polygone of all points on each layer.