Hi guys! Firstly I’m a beginner on grasshopper. I make Deconstruct Brep and List items, after I want to all front surfaces number 1 and backs number 2. but how can I make
1.3dm (302.5 KB)
ORIENT DENEME.gh (10.4 KB)
?
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Thank you so much. But I don’t understand at all. How is the Sort list (reverse) + List item able to select the surfaces I want?
Thank I got it 
In this case, you could use the Y-position of the face centers to isolate these 2 faces:
k_re.gh (2.8 MB)
Edit: You could also compare the normal directions of the faces to the unit-Y vector:
k_re2.gh (2.8 MB)
-Kevin
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I got it Kevin Thank you so muck
You could try building it by yourself, @kev.r already showed you all the tools you need.
In a first step I would search for a common property they share to be able to isolate them.in your case it’s the three uppermost faces.
Just wanting to push you a little bit to practice the thinking of how to create an algorithm.
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Tamam artist Bariş. You are right.
Do you have a detailed training content recommendation?
I would pick some structured content(like the primer) for the basics and also choose a tutorial to create some stuff that seems interesting to me.
Also reading the forum and trying to understand other people’s problems/definitions helps a lot I think.