Texture breaks at seam when converting nurbs surface to mesh

Rendering
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1

Hi,

I guess this has to be a known issue - when I convert surface from NURBS to Mesh the texture messes up at the seam like this:

image
image1279×662 69.4 KB

panel.3dm (449.3 KB)

How can I fix or prevent this from happening? I know meshes have indices and I guess mapping the render mesh from nurbs surfaces to the new mesh throws them about. But I have no idea how to fix it.

Any help appreciated :slight_smile:

p.s. I have dozens of panels going over the seam so fixing them one by one is not practical. Even if I wanted to try that, I can´t see the new mesh mapping mesh in the UV editor.

2

Hello
this seems to be a bug, in Rhino 7 extract render mesh keeps the same UV.

image
image1866×610 84.8 KB

in R8 yo go from this for the surface

image
image1069×802 83.8 KB

To this for the mesh

image
image1083×792 86.8 KB

Same thing on R9 WIP
@Jussi_Aaltonen any idea ?

3

Well, Rhino uses texture baking (Advanved Texture Preview) to draw that object because of that texture mapping seam.
Advanced Texture Preview does not work with mesh objects, therefore it looks broken.

4

The render mesh is out of date. If you switch the texture’s mapping channel to 1 and then run _ClearAllMeshes you’ll see that the render mesh of the surface is not what is stored in the file.

What is the Rhino version and workflow used for creating that surface?

5

A model was created I believe in Rhino 7, than modified multiple times In Rhino 8. Sometimes the surfaces were used, sometimes the mapping was transfered to new objects. It is difficult, I can´t name all the steps simply because I do not remember :smiley:

Could that be it? What was done in Rhino 7 stays in Rhino 7?

6

Could be. I don’t have any idea how to fix existing models. But of course we should try to find these kind of bugs in new versions of Rhino.