[Captura de pantalla 2026-05-13 144635] Always exporting this AM65 fail Painter mesh.3dm (801.0 KB) mesh or surface from a simple triangular NURBS surface (created from three boundary curves) produces a file that fails to import properly into Substance Painter (up to version 2026) [image] and…

Hi @AlanMattano Let me first try to explain how this thing works. Moving the mapping primitive in case of a custom object mapping rarely makes sense. If you click Show mapping you can see what happens. [MovingMappingPrimitive] Custom mapping is a closest point projection to the mapping primitive…

AM65 fail Painter mesh.3dm (801.0 KB)

I presume that Is an error from my side. That i’m adding Position -1 to X And the screenshot shows that [image]

II found other meshes with the same UV issues. Same problem, and this time all the properties are correct. [image] When copying and pasting into Rhino 9, the properties change. But the real problem is that it scales when imported into other applications. If you want to troubleshoot this issue,…

Here’s another very similar UV mapping error. It’s not exactly the same. And while recording the video, a second material error occurred. AM65 UV mapping fail 3.3dm (12.9 MB) Video: https://youtu.be/PEzKERLGwqc

@Jussi_Aaltonen or @andy will want to take a look at these.

If you export from Rhino as OBJ or FBX and then take those files into Substance Painter and Rizom, do they show correct UVs?

[image] Soaring Stars lab: Here’s another very similar UV mapping error. It’s not exactly the same. And while recording the video, a second material error occurred. AM65 UV mapping fail 3.3dm (12.9 MB) Video: https://youtu.be/PEzKERLGwqc I’ve logged the bug about the custom display mode no…

Your explanations are great, very helpful. Thanks for your time. [image] Jussi Aaltonen: Export from Rhino as OBJ or FBX … , do they show correct UVs? I answer here. [image] Rhino WIP Feature: UV Editing Improvements Serengeti (Rhino WIP) Hello Jussi,…

Bug Report: Surface Mesh fails to import in Substance Painter (UVs)

Rendering

AlanMattano (Soaring Stars lab) May 30, 2026, 5:21am 12

Your explanations are great, very helpful. Thanks for your time.

I answer here.

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Bug Report: Surface Mesh fails to import in Substance Painter (UVs)

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