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About exporting normal maps

Community Beginner ,
Apr 19, 2024 Apr 19, 2024

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Hi everyone,

 

I have unwrapped a model following the automated process.

I have checked the normal map in S3DP: it looks good and has black background between the islands.

After exporting it, I've got a different map having purple/blue color for background with artefacts.

 

The question is: is there any setting allowing to get black background between islands, like in S3DP, after export?

I think it would be better for visualization.

 

Thanks a lot!Normal_Export.pngNormal_In_S3DP.png

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Community Beginner ,
Apr 23, 2024 Apr 23, 2024

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Any idea maybe? Thanks.

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Community Expert ,
Apr 24, 2024 Apr 24, 2024

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Check your padding settings in Export >Settings> Global (and by individual texture set if overridden). The screenshot you show is expected when padding is set to dilation infinite.

 

Dave

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Community Beginner ,
May 03, 2024 May 03, 2024

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Hi,

Thanks for reply.

Unfortunately it doesn't solve the issue.

I tried first "Dilation + Transparent" and then the other options.

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Community Expert ,
May 03, 2024 May 03, 2024

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Can I ask what is to solve? The use of padding (dilation) is both expected and normal practice as it avoids issues along the seams with mipmaps.

 

Dave

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Community Beginner ,
May 03, 2024 May 03, 2024

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Sure.

When I import the textures, the space between the islands is not black, it is purple as shown on the first screenshot I uploaded.

I have a black color in Substance 3D as shown in the second screenshot.

Dilation is infinite but when I change it to transparent it doesn't solve the issue.

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Community Expert ,
May 03, 2024 May 03, 2024

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Having no dilation and black right up to the UV edges can cause visible issues in the seams when rendering. To rephrase my question - what issue are you having by not having them black?

 

Dave

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Community Beginner ,
May 03, 2024 May 03, 2024

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If you say that having black color between islands could be an issue for rendering, in this case we can keep it so.

My last question is: why are there such artefacts and not uniform purple color?

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Community Expert ,
May 03, 2024 May 03, 2024

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The padding works by extending the colour outward from the edges, so whatever colour is on the normal map edge pixels is extended outward into the unused UV area. If a standard normal colour was used then that would also potentially show as a seam artifact on rendering.

 

Dave

 

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