Adjust closed surface seam in Grasshopper

Grasshopper
1

Despite the plethora of GH plugins that I have, I was unable to find a component to do what the Rhino “Adjust closed surface seam” does.

Asjust closed curve seam
Asjust closed curve seam761×538 30.4 KB

Any suggestions or workarounds ?

2

Extract isocurves, change their seam, and recreate the surface.

3 
var dir = s.Faces[0].IsClosed(0) ? 0 : s.Faces[0].IsClosed(1) ? 1 : 2;
if(dir != 2)
  A = Brep.ChangeSeam(s.Faces[0], dir, p, Rhino.RhinoDoc.ActiveDoc.ModelAbsoluteTolerance) ?? s;
else
  Component.AddRuntimeMessage(GH_RuntimeMessageLevel.Warning, "Surface is not closed and the seam cannot be adjusted");

SrfSeam.gh (62.8 KB)

8 Likes
4

Spot on !

5

Hi. I just found your script as I had the same issue. Brilliant, but do you also have it i nU-V direction for a torus or closed pipe? I need the outside edge somewhere else to avoid issues in boolean operations.
Thank you.

image
image1124×573 57.5 KB

6

You can make your own pipe. It’s a little fragile, not all values of the seam slider work.

pipe_seam_2022Oct6a
pipe_seam_2022Oct6a1202×389 64.2 KB

pipe_seam_2022Oct6a.gh (6.8 KB)

P.S. It appears to work the same way with only one section circle at the start of the curve (‘t’=0):

pipe_seam_2022Oct6b
pipe_seam_2022Oct6b1245×268 58.5 KB

pipe_seam_2022Oct6b.gh (6.8 KB)

2 Likes
7

Thanks for the idea. I tried something similar. The issue is that I have ca. 500 irregular pipes (all shuffled in a different way) where I just need to seam the outside edge to have less issues with boolean operations.
If I build them up in this way the result will be a bit different and it will last quite a while. Also the Sweep tools do not work well in Grasshopper - there are always some pieces that just do not work once the pipes get a bit more complicated.

What bothers me the most is that the seam surface tool exists in Rhino, but not in Grasshopper. Just simple: input: surface+seam U+seam V.
They made us love the Grasshopper, now they make me seaming 500 pieces by hand :sunglasses:

8

Surface Seam+.gh (60.2 KB)

I took the chance to work on this topic before the year ends and reworked the c# script from @Mahdiyar above.
So the scipt now projects curves on a brep and moves the seam far away from the surface to have less issues when it comes to boolean operations.

image
image1211×472 79.7 KB

Strange enough we have SrfSeam in Rhino, but not in Grasshopper and I also could not find it in Python (which I know a bit), so luckily enough the c# script by @Mahdiyar was written clear enough so I could not completely destroy it…