Texture mapping UV editor not working

[REMI_05_COSTAMAGNA]

Hi everyone,
I’m trying to render a wooden tray handle, and using UV editor and flow to make the grain flow along the curve. I’m following the process described here
I’m unwrapping the top and bottom faces first.
After using _Flow , it looks about right in the UV editor, but the mesh is strange on the piece, like there’s added curves in the mesh.

Any idea what might be causing this, and how to fix it? The file’s attached
Plateau lamellé.3dm (9.9 MB)

Graphics card’s driver’s up to date.
Rhino 7 SR38 2024-12-3 (Rhino 7, 7.38.24338.17001, Git hash:master @ 97e36efa02d7f71638988290bb2d190fcf1b18c5)
License type: Educational, version 2024-12-03
License details: Cloud Zoo

Windows 11 (10.0.26100 SR0.0) or greater (Physical RAM: 7.8Gb)

Computer platform: LAPTOP - Plugged in [100% battery remaining]

Standard graphics configuration.
Primary display and OpenGL: Intel(R) UHD Graphics (Intel) Memory: 1GB, Driver date: 1-14-2022 (M-D-Y). OpenGL Ver: 4.6.0 - Build 30.0.101.1273
> Integrated graphics device with 3 adapter port(s)
- Windows Main Display is laptop’s integrated screen or built-in port
- Secondary monitor attached to adapter port 1

OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 4.6 (primary GPU’s maximum)

Anti-alias mode: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High

Vendor Name: Intel
Render version: 4.6
Shading Language: 4.60 - Build 30.0.101.1273
Driver Date: 1-14-2022
Driver Version: 30.0.101.1273
Maximum Texture size: 16384 x 16384
Z-Buffer depth: 24 bits
Maximum Viewport size: 16384 x 16384
Total Video Memory: 1 GB

Rhino plugins that do not ship with Rhino
C:\Users\remic\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\IntelDenoiser\0.6.4\IntelDenoiser.Windows.rhp “IntelDenoiser.Windows” 0.6.4.0

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 7\Plug-ins\Commands.rhp “Commands” 7.38.24338.17001
C:\Program Files\Rhino 7\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 7\Plug-ins\RhinoRenderCycles.rhp “Rendu de Rhino” 7.38.24338.17001
C:\Program Files\Rhino 7\Plug-ins\RhinoRender.rhp “Ancien rendu de Rhino”
C:\Program Files\Rhino 7\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 7.38.24338.17001
C:\Program Files\Rhino 7\Plug-ins\rdk_ui.rhp “Renderer Development Kit UI”
C:\Program Files\Rhino 7\Plug-ins\import_ACAD.rhp “AutoCAD file import: import_ACAD”
C:\Program Files\Rhino 7\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 7\Plug-ins\RhinoCycles.rhp “RhinoCycles” 7.38.24338.17001
C:\Program Files\Rhino 7\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 7.38.24338.17001
C:\Program Files\Rhino 7\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 7\Plug-ins\Displacement.rhp “Displacement”

[Normand (Jakob Normand)]

hi @REMI_05_COSTAMAGNA
A couple of things: The repeat value for your wood texture is set to 0.01 - I’ve taken the liberty of bumping it back to 1, so that it’s a little easier to adjust. If you need to adjust the size of a material, I find it easier to change the UV repeat value - but YMMV.
The actual problem in this case is the fact that your mesh (that’s the render mesh, which is used as the basis for the UV mapping) is way to coarse for this type of operation. In the attached file I’ve upped the render mesh for the whole scene, but it can be done with a custom render mesh, if just needed for one (or a few) object(s).

With a finer mesh, I’ve used FlowAlongSrf instead of just flow, creating lofted surfaces from the edges of the handle side. Those curves were rebuild to degree 3 curves with 500 control points each, so that the loft is nice and smooth. A similar loft was made with straight edges as the target surface for the flow operation - see the attached file for the result.

Plateau lamellé_JN.3dm (2.4 MB)

I’ve also taken the liberty of deleting all the other, irrelevant objects you passed along - please only post the object(s) relevant to the question - and moving the object to 0,0 for my own convenience. I reckon you can move back where it belongs
HTH, Jakob