White line artifact on mesh edge

[peterc30948183]

Hello,

I'm dealing with an issue in Substance Painter that I've tried to solve using many well suggested solutions on different forums, but I cannot seem to fix what looks to be something simple, most likely a misunderstanding on my part and not a technical issue within the software as far as I can tell.

I modeled a low poly lamp in Blender and applied vertex fills to assist me in Substance. Whenever I bake my textures in Substance Painter, an edge on the lip of the lamp shade does not get textured, instead it remains white like the default mesh. My UVs in Blender do not overlap and they have been straightened with plenty of space between islands. I've tried various methods of smoothing, unsmoothing, marking/unmarking sharp edges, marking/unmarking seems on the edge where the artifact is appearing and nothing is working. I've also messed around with baking at 4k in Substance and upping the supersampling to 16x. The only thing that changes is the position of the artifact when applying some of the changes listed above, but they never get rid of it completely as far as I can tell. Below are images of the artifact and my UV layout in Blender.

In the past, most of my work has required the assets to be far enough away from the camera for these artifacts not to be noticeable which includes this model, so I've always turned a blind eye to them. But now I really want to understand why this is happening because I want to make sure all assets moving forward will look good at any angle. What has me most perplexed is why it's only appearing on half of the mesh while the other half looks fine with no artifacting.

I've attached the FBX of the lamp itself in case that is helpful. If anyone could provide me with some guidance it would be greatly appreciated.

[Cyril Dellenbach]

Hello @peterc30948183,

Thanks for the mesh and all the details.

I've tried to reproduce the issue with the linked .fbx to give you a proper help, but unfortunately no artifacts appeared on my side. Does painting over the white line works? If you simply apply a fill layer on the entire mesh, does the artifact remains?

Also, Could you share the substance project with the issue, so I may take a look?

Keep me posted.

[peterc30948183]

Cyril,

Good questions, I had not tried painting over the line to narrow down what the issue might be and it looks like doing so does go over the line as indicated by the blue stroke in the screenshot below.

At the very least that means I could fix the issue by painting by hand, however I'm still curious as to why it's happening. I also tested to see if it's only in the viewport, but the line shows up in my exported textures as well.

Here is a link to an updated .fbx and a stripped down .spp file: LINK

[Cyril Dellenbach · Accepted solution]

Thank you very much for the project. The issue comes from the mask. On your ID map, the border of the UV islands can fade out a little bit, therefore you'll need to increase the tolereance of the color selection mask.

Increasing the tolerance

Best regards,

[yehia31181166ckun]

Hello there I am not sure if your problem has been completely fixed or not yet, I hope it already is, anyways, I was facing the exact same problem with a model that I have been making, and the problem seems to have something to do with the uv padding, if you simply change it from using the 3D space to the UV space that will probably completely eliminate the problem, and I hope it does, best of luck!

[peterc30948183]

@Cyril Dellenbach So sorry for not replying sooner, I know it's been months but every time I meant to reply something came up that made me forget. For anyone else having this problem, Cyril's solution works (for me at least). I had no idea about tolerance slider in the Color Selection Properties panel. Whenever I'm using that panel I pick the color and leave it immediately, I've never paid any attention to those additional settings.

@yehia31181166ckun I appreciate your solution as well, yet another option of which I was unaware. In this particular project, it did not appear to work for me, but I will remember that option for future troubleshooting. I'm sure in other cases it will come in handy.

Thanks again to both of you, I hope anyone else having this issues will find this thread useful.