I am trying to extract each level of the panels and separate by diagonals :
2023.07.24_ForForum_SG.gh (5.4 KB)
Hows this?
2023.07.24_ForForum_SG.gh (10.5 KB)
Actually, this one’s better.
2023.07.24_ForForum_SG.gh (12.8 KB)
@inno Yours is much better than mine. 
they come out from Lunchbox as an array of 27x3 rectangles split into two triangles along their diagonal
and are numbered progressively bottom-up left-to-right
by partitioning the list by 3*2=6 we get lists of columns of triangles: we get exactly 27 lists with 6 items in each
then with Flip Matrix we get the opposite, which is 6 lists of 27 items in each:
at this point by flattening the Flip Matrix we will just put all the items back in one list, but they will be sorted like this:
now we can divide in 3 long rows of 27*2 items each with Partition List again, in such a way to get 3 main branches {0}, {1}, {2} with 54 items each:
and finally partition these branches into two new branches each {x,0} and {x,1} which will hold the triangles as required:
Thanks for explaining that. I am still learning how to best use Data Trees in GH, what should I do with the 6 branches to separate the triangle panels into their own brep groups? (I would like to manipulate each group in differently)
@Samantha_Garza
If you want some good resources on data trees
01 Basics of Data Trees - YouTube
I also strongly suggest to digest the serie indicated by @Ryan14 [bad taste joke removed]
to manipulate those 6 branches separately you can just stop after the first Partition list,
the most important thing to consider is to have a data tree for the “manipulation” that is matching the data tree of the “data being manipulated”
stupid example of scaling each branch by a different unique value: 6 branches for the panels, 6 branches for the scaling factor
2023.07.24_ForForum_SG_Re_Re.gh (15.8 KB)
They were made by @DavidRutten
Grasshopper 3D - Wikipedia
what did I say? 
yes that’s him