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Enabling "Recompute Tangent" creates hard edges on UV border seams

I'm testing out Recompute Tangent on a mesh, and it works great so far.

However I can see visible hard edges where the UV borders are within the mesh.

  1. Open a new project in 4.16 (completely blank if you like)

  2. In the project settings, enable Support Compute Skincache

  3. Import your skeletal mesh into the engine. Use default import settings.

  4. In the LOD0 > Sections rollout of the mesh in Persona, turn Recompute Tangent to ON.

  5. Observe the mesh's UV seams appear and disappear as you turn the Recompute Tangent box ON and OFF.

Expected behavior: there should be no seams when Recompute Tangent is ON.

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Product Version: UE 4.16
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asked Jun 08 '17 at 01:11 PM in Bug Reports

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avatar image DHelmsman Jun 26 '17 at 07:17 AM

I can second this problem. Only happens when Skincache is enabled.

avatar image Adeptus Jun 30 '17 at 02:34 PM

i also have this problem, its serioue enough to prevent me from using this feature.

avatar image Transformers Aug 11 '17 at 03:29 AM

It's an annoying issue. It also appears alembic imported as skeletal asset with unwrap uv.

avatar image jmalaska Sep 25 '17 at 01:32 AM

Anyone at Epic know what might be up here? This seems to make the feature not as useful as intended.

avatar image robocop Feb 07 '18 at 03:09 AM

Yepp the same issue we still have in 4.18 :(((( So, we cant use recompute tangent option.. Guys please fix that.. :)

avatar image YuuJin Aug 13 '18 at 07:32 PM

is this still a thing? I seem to be getting the UV turns into a hard edge issue as well I can see the issue go away when I set the display toggle in the alembic asset to show>advanced>CPU skinning but I dont know how to enable that in-game on the specific mesh

avatar image mlindborg Aug 13 '18 at 07:42 PM

They changed something in 4.19 which made it a bit better but it's still noticable. Enabling show CPU skinning doesn't fix it, it just overrides the feature

avatar image Athelios Aug 17 '18 at 08:58 PM

Same problem in 4.20. This bug makes Skincache unusable for me. But Skincache is really needed feature. Epic please fix it.

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