Flow along surface issue

Rhino SubD
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1

Hi, everybody, I’m new here, nice to meet you all.
I’m new to rhino, this amazing software. While trying to flow some objects along surface, I came across something really annoying. The objects are there, I can highlight them, but the surfaces disappear.
By clicking on object’s details, Rhino gives me this:
Object one - Original.
surface

ID: d8a7cc60-c0c1-4a07-8eb2-17536e05a977 (128)
Object name: (not named)
Layer name: Surfaces::Stone-seed::Bixbite
Render Material:
source = from layer
index = -1

Geometry:
Invalid surface.
closed surface.
NURBS Surface"U": degree =3 CV count = 13 (0 <= U <= 0.171536)
“V”: degree =3 CV count = 7 (0 <= V <= 0.470813)
Edge Tally:
2 singular edges
1 manifold edges
= 3 total edges
Edge Tolerances: all 0.00394295
Vertex Tolerances: all 0
Render mesh: 1 mesh 561 vertices 512 polygons
Created with fast meshing parameters.
Analysis mesh: none present.

Object 2 - The same object that had been flown along surface.
surface

ID: 86dc1986-6a9a-49d6-ab04-b60bd7fb3445 (3974)
Object name: (not named)
Layer name: Surfaces::Stone-seed::Bixbite
Render Material:
source = from layer
index = -1

Geometry:
Invalid surface.
closed surface.
NURBS Surface"U": degree =3 CV count = 13 (0 <= U <= 0.171536)
“V”: degree =3 CV count = 9 (0 <= V <= 0.470813)
Edge Tally:
2 singular edges
1 manifold edges
= 3 total edges
Edge Tolerances: all 0.00416474
Vertex Tolerances: all 0
Render mesh: 1 object custom mesh 2 vertices 0 polygons
Created with fast meshing parameters.
Analysis mesh: none present.

Included in this post, a print of the situation. I hope I’m not showing something that had happened to you before, my sincere apologies if this is a repeated post, but if not, how may I solve this issue? Thanks to all of you and have a good day.

Rhino flow along surface issue
Rhino flow along surface issue1920×1080 329 KB

2

hard to tell without a file.

your surface is “invalid” already before the flow command.

after the flow, the render mesh is totally broken> 2 vertices 0 polygons

you can try “refreshShade” command on the surface to rebuild the rendermesh, or try a custom mesh setting via object properties panel, but it would be better to fix the invalid surface before flowing.

did you try to rebuild or recreate the surface in question? they all look similar/same just different materials… maybe just copy another one in its place?

3

Many thanks, my friend. I will recreate everything. All the other surfaces are valid ones, so I think this might be the problem. One last question, why and how a surface becomes invalid?

4

Hi -

There isn’t a list that states all the condition in which that can happen. We would need to see the 3dm file in the “before” state and a list of steps to take to make it invalid to see what’s going on. While unlikely, you running a cracked copy of Rhino could be a factor.
-wim

5

Oh! Only cracked versions of Rhino create invalid surfaces? Jesus, that’s odd.

6

I suppose you missed the “while unlikely” part of that message?
-wim

7

Absolutely, I was just amazed about that. Thanks for the help, my friend. :slight_smile: