Hi, How can I select all cels on 1 horizontal grid and then cull these cels.
Thank you.
Inverte the way to select faces.gh (13.2 KB)
Does FlipMatrix not work? I see you have it on the canvas already.
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I hate Bifocals 
cull_faces_2024Oct23a.gh (17.3 KB)
P.S. I should have rounded the Z values to make sure sets are created properly. I got lucky this time. Usually an expression on the pDecon āZā output that rounds to two or three decimal places is enough: round(x,2). But that depends on the Z values.
And by the way, Deconstruct Brep wasnāt necessary or helping you because the Isotrim output was already surfaces.
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Thereās no need to find the areas and risk use sets.
Inverte the way to select faces.gh (15.5 KB)
option 1 is with direct index, option 2 is with ratios like Joseph suggested.
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ārisk setsā 
Rounding centroid Z coordinates eliminates the risk. I have used variations of this technique using Member Index many times, in many different contexts.
But you are correct that it wasnāt required in this case.
cull_faces_2024Oct24a.gh (11.9 KB)
I am all in favor of finding multiple ways of accomplishing the same goal but donāt see how your methods achieve the goal of this thread 
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By risk I meant on a larger scope, using sets on decimals can be risky and has been for me.
There are cases where itās safe, but isnāt always the best option.
Anyway, I guess itās might also be just an opinion 
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For the third time, rounding can eliminate that risk.
Sometimes you donāt know how the geometry was built.
But for the second time, in most case (like this one) it works, and it was my opinion 
Let me change āriskā to āuseā so thereās no conflict
Hi Joseph,
Great it works as expected. Sorry for Bifocals, what do you propose instead ?
Hi martynjhogg, not I tried but dont work.
Thank you Antoine Maes, easy way and works as expected.
Sunglasses. WAY better And I would avoid āDraw Full Namesā.
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