Awww…
broken.
Fixed: 241115_diagonal_branch_weaving volker2.gh (42.6 KB)
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amazing it works perfectly for a single grid but i could also do multiple grids at once? tryed it a little but could not make it work. Generelly i think the tree item component is realy nice to solve this but i am wondering if the paths and indicides could be generate at bit easier 
i had a look into relativ items but could not create a matching path mask for this pattern - it migth also be an approach
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Maybe? The chokepoint is going to be flip matrix for you there, which you would have to replace with pathmapper since flip matrix only works with single depth differentiated tree branches.
I don’t know how Relative Item is going to help you here. What Relative Item does is take an element in a certain branch at a certain index in a tree, and finds another element through a relative offset. In branch 0 (first column) of the grid, there is no item to relative offset from to get squares that don’t belong on a diagonal in the first column.
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thanks a lot - i will try to make it work with multiple grids and deeper branches and leave the topic open for now maybe some one else comes with an other approach.
Thats was i manged to create with relatives items which looks like it goes in a rigth direction but i will continiue with your script.
241117_diagonal_branch_weaving.gh (21.2 KB)
I suppose you could attempt to solve the problem geometrically; by creating diagonal lines and searching for the cells whose centroids intersect with those lines. But I don’t know if running the computer through a bunch of intersection searches will be faster than culling the nulls from my working solution.
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