Ambient Occlusion weird artefacts

tabacaru_mvlad

Hi,
Anyone else experience this weird artefacts when baking in Marmoset ? I tired everytinhg, reset xform, reset normal, export withouth any of them as obj, noting seems to work. 80% of the objects are correct, 20 % are like this and don`t understand why. In the image top left corner are the artefacts. I get the same result when baking normal map as well, on the same objects.
Thanks

Fabi_G

Hi! Based on your description and image, can't see the issue. Ideally share files for inspection. 

tabacaru_mvlad

Sorry for responding so late, I changed my graphic card, my windows and my computer was off for few days. I attached files for better seeing the difference. It`s very faint, but there are some artefacts. My computer with new windows and new graphic card does the same, so look like a driver/software problem. No one else encountered this problem ?

Eric Chadwick

Can you add an arrow to point out an artifact? These don't look wrong to me.

How does that area look when applied to the model and shown full-bright?

tabacaru_mvlad

I`ve put the original file, next to one where I enhanced the contrast for better visibility.

Eric Chadwick

Could you please put the texture on the model, as fully bright, and zoom into the affected area? It’s impossible to evaluate the problem without seeing it in context.

What does the model look like without any textures, just a gray color and regular lighting? I suspect the problem is your surfaces are uneven with a lot of detailed mesh.

tabacaru_mvlad

The low poly or the high poly model ? I double checked them, they are smooth. Interesting thing is that if I bake only those seats they are correct. If I put the other elements around, and they cast ambient occlusion on them, I get these artefacts.

Fabi_G

The low poly model with the AO map applied.
Do the parts with issues have overlapping/stacked UVs (if you say seats, are they duplicated?)

tabacaru_mvlad

Nope, they don`t have overlapping UVs. And they bake correctly without any other objects nearby. I though maybe someone else experienced the same problem. I will make more tests and let you know, thank you.

Eric Chadwick

Can you share a screenshot of the low poly shaded wireframe?

tabacaru_mvlad

I will, next Monday, when I arrive back home. Thank you so much for your help.

tabacaru_mvlad

I increased ray count from Ambient Occlusion to maximum (4096) from 256 and the results are much better. In the bottom part of the seats you can see the difference, the artefacts disappear.

EarthQuake

Yeah, I was going to suggest increasing the ray count.

Another thing you might try is limiting the Search Distance to limit how far the rays are cast. This can help with things like vehicle interiors where most of the rays will be partially or fully occluded.

tabacaru_mvlad

Thank you guys a lot for helping me. Increasing ray count did the trick for me.