Bunch of trimmed surfaces are recognized to 1 surface

[HS_Kim]

I’ve already mentioned in another topic of yours, you can’t use Evalute Surface because they are “Trimmed Surfaces”

Display item /data conversion failed text to surface-How can I replace items with making it to text?

[image] [image] 190715 2.3dm (120.8 KB) 190715_2.gh (22.0 KB) /qouwMsXKyNGUwxPgeHHuJFoqsZ9.png) Hi. I have to divide surface by every 5Nth given lines, and give own ID for each divided srf. I have done dividing, importing ID from excel file. And I tried 2 ways>> ② I think the ID should be items of the divided surface list. To match each ID to to the list I used ‘replace item’. But the result list is not getted into ‘surface’ of ‘evaluate surface’. (to make points on each surface to in…

If you trim a single untrimmed surface, they are divideded but they still remember their underlying original untrimmed surface.
It’s one of the most recurrent questions of nurbs novice.
You can refer to the following linked topics and articles about that.

Subsurface subdivision problem

This is one of the most recurrent question regarding subdivision with trimmed or untrimmed surface. See the link bellow to understand the underlying theory. And I can show you one workaround way on this using Copy Trim and Surface Morph. http://docs.mcneel.com/rhino/5/help/en-us/seealso/sak_splittrim.htm http://docs.mcneel.com/rhino/5/help/en-us/index.htm#commands/untrim.htm [Canvas%20at%2014%3B01%3B24] SubdivisionTrimmedSurface_re.gh (33.0 KB)

Split and trim commands | Rhino 3-D modeling

http://docs.mcneel.com/rhino/5/help/en-us/index.htm#commands/untrim.htm

And check the attached definition. Your text ID from excel file has only 7 lines whereas your surfaces are 13, so they do not match. And again, this is not the place where Replace Itemscomes in.
I’ve just tried to show you the way to tag ID to your trimmed surfaces.

190715_3_re.gh (24.4 KB)