UDIM support updated?

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tt01070

• March 19, 2020 04:38

Hello,

 

I'm wondering if importing and exporting UDIM texture is now available in RC.

I've read some in community, but those were few years passed.

In the articles, some says there is a overlapping problem when exporting texture from RC.

If any updates, please let me know.

Thanks!

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  Erik Kubiňan CR

  • March 19, 2020 13:17

  Hello dear user,
  UDIM directly is not supported, but you can have and use multiple textures for one UV space in RC. Overlaps should not be present and by adjusting Gutter (UV islands spacing) parameter in Unwrap settings you can prevent this easily if so.

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  ssh4

  • March 24, 2020 10:54

  imagingcombine, RealityCapture have UDIM support already for couple years. At least, Houdini, Blender, 3D-Coat, zBrush understand RC multi textures as UDIMs without issues.

  And you can import multi UDIM cleaned mesh to RealityCapture from modern DCC hosts like Blender, Houdini, etc., without any issues.

  Erik Kubiňan, we using UDIMs in RC in our studio scans :)

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  Erik Kubiňan CR

  • March 25, 2020 08:51

  Well, it is good that you have found such workaround but until it is not directly UDIM unwrap, I cannot call it so. If we have had a regular UDIM support you would have multiple Unwrap spaces side to side. What we do is a classic 0-1 Unwrap space where more textures can fit in, but not more than one space will be used to fit the islands in. Anyways good point if above stated works.

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  Jesse Rapczak

  • June 26, 2020 02:03

  Is proper UDIM support coming soon? It would be nice to load an Alembic file directly from Reality Capture without having to process the UVs before the textures map correctly. 

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  ssh4

  • June 26, 2020 02:06

  Jesse, can you tell me what exactly not working for you if you using this settings?

  

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  Jesse Rapczak

  • June 26, 2020 03:03
  • Edited

  When using the UDIM tile type from the UI, the textures are generated correctly but the UVs are all stacked on top of each other instead of being offset per tile. When importing the Alembic file into Maya, 3DSMAX, or Houdini, the UVs must be manually processed and laid out. Attached is a comparison of the before (all UVs in 0-1 range) and after (UVs in 1001-1030 range). 

  I would also like to add that it does not appear vertex colors export correctly with Alembic. I had to use .ply export in order to get vertex colors in Maya and Houdini.

  

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  ssh4

  • June 26, 2020 03:03

  This is looks more like Alembic export issue.

  Any reason to use Alembic instead of OBJ that support all you mentioned?

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  Jesse Rapczak

  • June 26, 2020 03:04

  Yes. Alembic caches load very quickly and take very little memory. OBJ files are huge, slow, take up a lot of memory, and are not optimized for viewport display or rendering. 

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  Jesse Rapczak

  • June 26, 2020 03:08

  I verified that OBJ UDIM tiles export works as expected. UDIM export does not work properly for Alembic or FBX (maybe other file formats). It would be great if UDIM tiles worked properly for all formats so we aren't forced to use .OBJ. 

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  ssh4

  • June 26, 2020 03:10

  Thank you!

  Alembic support was added not far ago, and not so many RC users using it. So i guess developers missed possible bugs in implementation.

  But FBX always a pain for every apps that not an Autodesk. 

  Definitely need to fix this issues. Asap.

   

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  Erik Kubiňan CR

  • June 26, 2020 06:27

  Reported this issue further. Thank you for your description.

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  SteffenAa

  • May 16, 2022 06:23

  Any update on this?  I'm trying to use blender to delete the hundreds of materials RC makes, delete them and replace with a single material and apply the UDIM textures to that and then export to substance painter.  Today, that didn't work suddenly.  Im not able to paint across tiles in Substance Painter, been using RC for 5 years now and I cant believe you have not fixed this yet...

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