It does not appear to matter to the repro steps what is input to the VertexInterpolator, it matters more that there is a Normalize between the VertexInterpolator and the base color input of the material.

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Repro project created in 4.27.1 attached.

Steps to Reproduce
  1. Create a new material, M_Broken
  2. Connect a Float3(1, 1, 1) to the VS input of a VertexInterpolator.
  3. Connect the PS output of the VertexInterpolator to the VectorInput of a Normalize expression
  4. Connect the output of the Normalize expression to the Base Color input of the material.
  5. Apply and save the material.
  6. In the level editor, drag a static mesh with LODs into the scene, then duplicate it.
  7. Drag M_Broken onto one of the placed static meshes.
  8. Activate the Mesh LOD Coloration view mode
  9. Note that the static mesh to which M_Broken is applied is black, while its unaltered counterpart displays accurate mesh lod coloration.

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CreatedNov 16, 2021
UpdatedSep 22, 2022
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