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Alembic cache doesn't display lighting correctly on TwoSided backfaces

If you have a face with backwards normals in an alembic cache animation, applying a material with the TwoSided flag on it does not correctly display the backfaces. Image showing the problem

It works correctly when the same file is imported as static and skeletal. On the underside of the cache geometry it is lit how the top should be.

Attached is this example project for 4.18 with the alembic file and source blender file. Also happens on 4.19 prev 6.

Example project

Product Version: UE 4.18
Tags:
example.png (610.3 kB)
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asked Mar 07 '18 at 12:17 PM in Bug Reports

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KnightArchitects
21 3 10

avatar image Jeff A ♦♦ STAFF Mar 09 '18 at 09:05 PM

Hello,

We've recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

https://forums.unrealengine.com/unreal-engine/announcements-and-releases/1410408-unreal-engine-bug-submission-form

Thanks

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