Vertex painting spline meshes inside Editor bug

Development Programming & Scripting
1

For some reason it is impossible to paint vertex color on a spline mesh in the editor. However, imported vertex colors work just fine on a spline mesh. Which leads me to believe it is not a limitation and instead a bug. Or am I missing something here?

Using imported vertex colors is not a solution in my case since I want to paint it over various instanced spline meshes.

2

Hey Davision,

This was a known issue, but has been fixed in the 4.11 preview 6 release. I just ran a test in all versions in the engine from 4.8.3 to 4.11 P 6 to confirm the fix does in fact work. If you would like, you can test this for yourself in the preview release mentioned, but I would not recommend upgrading your project to a preview release until the official release has been pushed to the public.

For your convenience, I went ahead and found the changelist and GitHub code that fixed the issue if you would like to integrate this code into your own custom build of the engine. I would be careful doing this though, as it could break break other things in the editor. Your best bet would be to wait for the official 4.11 release, but if you want to try out the fix for yourself in source head to the link below.

GitHub - Spline Mesh Fixes

https://github.com/EpicGames/UnrealEngine/commit/af632c0c8159acaf9e484395e8c657ae4a60c729

Let me know if you have further questions.

Cheers,

3

Thanks, there are 2 other bugs that I found while painting on regular meshes:

  • On some areas of my mesh it won’t let me paint, there are clearly vertices but they don’t even get highlighted by vertex paint mouse over. That is a very big mesh with ca 128000 tris if that matters.
  • On UVW edges 2 vertices occupy the same space and vertex painting seems to have a bit of trouble with that. The 2 vertices have the same position but sometimes the vertex color will be not painted exactly the same. Normally that is not a problem but when doing something with World Position Offset it is a big problem since the mesh gets slightly split and you see holes. I’m already painting with ignore back facing off and with imported vertex color it works just fine.

Any chance those issues are there already fixed too?

4

If you would like, you can download the preview release an test it for yourself :slight_smile:

If they are still occurring in the preview release, you can reply to this comment with the details of the issue and we will continue to investigate.

Thanks,