Viewport selection with nodes

[AlexC]

Hello
I've been teaching myself scene nodes, and have been trying to do some simple stuff with parametric objects and selections.
One of the things that I find quite frustrating is that I haven't been able to figure out how to make selections based on a "region"
What I'm trying to do is
1/Select a few polygons (I can easily do this with the multiple selection tools by just entering their indices)
2/Apply a subdivision
3/Apply an extrusion to just that set of subdivided polygons

Between step 2 and 3 of course my selection no longer works as the indices have changed.

Is there a way to create something like a bounding box or a field that would "contain" any polygons within it, and make that a selection? That way I could subdivide and extrude in sequence without having to create a new selection?

Thank you!

[Dr. Sassi]

Hi AlexC.,

Please have a look here:
CV4_2025_drs_25_SNse_01.c4d

Node 1 - Select
First I select polygon 3 and 4

Node 2 - Subdivide
Selection is set to "all"

Node 3 - Extrude
Selection is set to Default

Is that what you are looking for?

All the best

[AlexC]

Hello Sassi, I've been playing around with that approach, and it does work. Not exactly the way you set it up, but see my file. I think I'm still curious to know if there is any object or field or vertex map I could use to have a more interactive (rather than numeric) approach to making these selections, as turning the Polygon indices on and off is a bit tedious, but this approach does work!
https://www.dropbox.com/scl/fi/s6w39calhdfb7e6dl08rr/WallNodeExtrude.c4d?rlkey=7lv3wolegr75ikb00ygqervtm&dl=0

Thank you!

[Dr. Sassi]

Hi AlexC,

How about this (press play)
CV4_2025_drs_25_SNse_02.c4d

Selections that are set in " " can be used, as long as the naming of the Selections is well done. Then you can use a Field and have the interactivity you might want.

All the best

[AlexC]

Hey Sassi
This is great! I forgot that you can add fields in selection tags...It is a bit hard to make it precise though, I find it very "on/off". I will play around with it a bit more, but this is a great approach, thank you very much!

[Dr. Sassi]

You're very welcome, AlexC.

Yes, selections are like switches.

Enjoy your weekend