Sorting issue after Surface Split

Grasshopper
1

Hi all,

I have checked similar topics but I couldn’t figure out.

Issue:
I couldn’t correctly sort the geometries after I used Surface Split.
I would like to extrude only the wanted part (B part, Image) but it is only working when the division of the initial surfaces are less than certain number.
I do not know how to get rid of the red color surfaces in the A part.

image
image1094×527 127 KB

Surface split.3dm (124.4 KB) Surface split.gh (16.3 KB)

Could anyone give me advice?
Thanks for your advice in advance.

2

In this case, Region Intersectionis not that tough and expansive solution.

Canvas at 16;38;42
Canvas at 16;38;421485×694 183 KB

Surface split_reV1.gh (11.4 KB)

3

Hi Kim,
Thanks. it works well.

4

Hi Kim,

I can’t use the solution in the other shape.

image
image1135×476 120 KB
Surface split-1.3dm (38.9 KB) Surface split-1.gh (12.7 KB)

What makes this difference?
Do you have any thought?

5

Canvas at 19;36;32
Canvas at 19;36;321474×678 136 KB

Surface split-1_re.gh (14.9 KB)

1 Like
6

Thanks a lot.
So I should define plane too if Region intersection is not working properly.