Two Sided materials are lit incorrectly on Niagara ribbons. The sides will be flipped of how they should be.

Steps to Reproduce
  1. Create a Niagara emitter with a ribbon renderer
  2. Create a material and set it to Used with Niagara Ribbons, and Two sided
  3. Set its base color to red (1,0,0,0)
  4. Set the Ribbon Renderer's Material to the newly created material
  5. Set the Facing Mode to Custom (Not necessary for repro, but makes it easier to see)
  6. Place the system in a level


The ribbon appears darker on the side facing the lights in the level than the side facing away

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There's no existing public thread on this issue, so head over toAnswerHub just mention UE-72831 in the post.

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ComponentRendering - Niagara
Affects Versions4.214.22
CreatedApr 15, 2019
UpdatedApr 23, 2019