When exporting PBR set, BaseColor always renders Black

Question

Whenever I try exporting a texture in the UE4 format - PNG (though it happens for any format) (for example a white wall) in preview it shows correctly even in the “BaseColor” tab. But when exported it ALWAYS no matter the setting exports a black square according to the resolution. The rest of the PBR set is correct tho (Basemetalness, Height, Normal, Specular roughness).

So when I end up connecting it up in UE, its all grey-black-ish for any texture.

Guillaume_Substance_3D · Accepted Answer

Hi ​@K0t4tkoo,After investigation, the problem is your exported map is actually fully transparent.We will fix this in a future release of Sampler. In the mean time, I can think of 2 workarounds to get a correct base color:export in jpg instead of pngAdd an opacity channel in your material preset (in “Channel settings” panel, “Edit list” button). By default, it should be white, that should correct the export in UE4 exported base color.Please, let me know if this does not work.Regards,Guillaume

K0t4tkoo · Answer

Hi Guillaume,Thanks for the workarounds. I tried the second option (adding a solid white Opacity channel via Channel Settings > Edit list) and confirmed the Opacity channel is genuinely white across the whole map (aside from two tiny artifacts — a dust spot and a couple of hairline gaps from insufficient photogrammetry coverage, both negligible).However, the BaseColor export is still coming out fully black. I've isolated it further and wanted to share what I found, since it seems like a distinct (or related but unfixed) issue:- The BaseColor channel renders correctly with full color in Sampler's own 2D/material viewport.- Exporting BaseColor as PNG still produces a fully black image.- I also tried exporting as JPG (your first suggested workaround) — this also comes out fully black.- Checking the exported PNG with `sips` on macOS confirms it has no alpha channel at all (hasAlpha: no, space: RGB), so this isn't the same transparency issue as before — the pixel data itself appears to be black.- All other channels (Roughness, Normal, etc.) export correctly from the same project.So the issue seems isolated specifically to the BaseColor channel's export bake — correct in-app, but black in the final file regardless of export format — while every other channel is unaffected. I'm on macOS, in case that's relevant.Let me know if there's any diagnostic info (export logs, project file, etc.) that would help you look into this further.Thanks,Kotatko

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