This node selects the inner or outer region faces by specifying the loop edge index. which is very similar to select loop inner region in blender editing.

vert,edge,face: Basic geometric data

loop_edge_ind: loop edge index

inside:The node will output the inside face index

external:The node will output the external face index

select region face index

1 node is the initial state, please feedback in time if you have any questions

2 The ultimate goal of the node is to merge into the backbone

3 The node imports the corresponding .json file using the sverchok import function

Thank you very much for your support before this, let me concentrate on this

https://youtu.be/YY4C04jWXCw