Creating an alternating pattern and subtracting one surface from another

[kookievsrhino (kookie)]

Hi all,

I’m struggling with 2 things here:

1. Creating a checkered pattern on a surface grid. What I can’t figure out is how to select every other cell in both directions (so it alternates by row and column, like a true chessboard).

2. Subtracting circles from the grid. How do I subtract those circles from the grid cells (so each cell becomes a frame with a circular cutout)?

I’ve attached my gh file. Please let me know as soon as possible,

File 1 Help.gh (16.3 KB)

Thanks!

[Piotr]

This?

File 1 Help.gh (17.1 KB)

[kookievsrhino (kookie)]

Yes this works! Thanks so much!

[Volker_Rakow]

Without Surface Split, and the ability to switch between even and odds:

File 1 Help VR 01.gh (14.9 KB)

---

Or maybe I misread, and a single surface is what was desired:

File 1 Help VR 02.gh (23.6 KB)