Hi everyone,
Here’s a SubD baked from Grasshopper using Delaunay Mesh → Quad Remesh from a point cloud. It looks fine, but when I try to convert it to NURBS, Rhino 8 gives me that ugly open polysurface.
Any idea what might be going wrong and how to make this geometrie clean in one piece ?
Thanks!
Hi Fabrice, it looks like it did everything it was supposed to do. With the ups and downs of that mesh, there won’t be a simple solution. Now if you’re not needing a tight tolerance you could reduce the mesh to a coarser( less detailed) outcome. That would make the nurbs surfaces less dense. Not really a solution, but if you play with it perhaps get something you can use.—-Mark
Hi markintheozarks, If you say that nothing’s wrong with this polysurface, then I’ll keep it as it is.
Thank you for your help !
that is sure not what he said. and i dont think it is.
maybe dont give up so fast. why not posting what you have so far i mean actual geometry and not just images. looking at your initial mesh i see that this already is pretty uneven. since we cant discern from your post what your idea is or what you deem ugly the feedback can only be so much naturally.
Oh yes, sorry for that.
I’m following a course about how to generate a landscape from points using GrassHooper. The mesh resulting from the SubD in the course is quite clean and is one piece without multiple surface edges like in my model. For that reason I was thinking that my geometry was bad . But later in the course, the guy explain that he is himself surprised that his geometry is so clean, and that is not a problem if it’s not for me. So it’s ok for me at this point with this model. I can continue to follow the course. Anyway, thank you for your advise.RegardsI can continue to follow the course. By the way, thank you for your advise.
Regards
ok so now we have a bit more information, meaning the uneven topology is not what is bothering but in fact only the patch layout when converting it to nurbs? it is pretty ok in my eyes, if Rhino manages to make a single surface from the geometry through the conversion then it will offer it as an option. you still could try creating a trimmed single patch from that with the initial geometry as input, but dealing with landscape topology it might make sense just to stick to meshes already generally. but again i dont know what your endgoal is. when its just a course which you try to follow to pick up as much info as possible then alright then 
Here is a video that shows one way to make a landscape. Maybe it helps. —-Mark
Thank you Mark for the link, unfortunately it doesn’t works, can you send it again ?
Thank you !
Look up Rhino for Architecture:2d contour curves
By Gediminas Kirdeikis
Youtube
Oh yes, I like that guy. It was on his course where i met the pseudo issue.
Thank you markintheozarks