Description

When mesh reduction results in a section becoming empty, the material slots are incorrectly assigned. e.g. if section 0 gets removed due to it having no triangles after reduction, then its material can get erroneously assigned to section 1 (the "new" first section).

In 5.0, we had a similar issue with Nanite, which was solved by permitting sections with zero triangles, and fixing up all the places in the rendering code which used to enforce that a section had a non-zero triangle count. It may be that this already works in 5.0, or a small tweak is all that's required in the mesh build process to allow zero-sized sections.

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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-150491 in the post.

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CreatedApr 28, 2022
UpdatedJun 6, 2023