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#UE5 LumenとTransparencyの関係性が全然わからんくなってきた。これはつまりReal-time Raytracing用にチューニングしちゃったマテリアルってもう詰んでて、Lumen用に全部作り直せって言ってるのだろうか？　緑茶がほうじ茶にしかならない。
それとも私のLumenへの基本的な理解が不足していることが原因？

●組み合わせ一覧
Global Illumination = None, Reflection = None.
Global Illumination = None, Reflection = Lumen.
Global Illumination = None, Reflection = Screen Space.
Global Illumination = None, Reflection = Ray Traced.
Global Illumination = Lumen, Reflection = None.
Global Illumination = Lumen, Reflection = Lumen.
Global Illumination = Lumen, Reflection = Screen Space.
Global Illumination = Lumen, Reflection = Ray Traced.
Global Illumination = Screen Space, Reflection = None.
Global Illumination = Screen Space, Reflection = Lumen.
Global Illumination = Screen Space, Reflection = Screen Space.
Global Illumination = Screen Space, Reflection = Ray Traced.
Global Illumination = Ray Traced, Reflection = None.
Global Illumination = Ray Traced, Reflection = Lumen.
Global Illumination = Ray Traced, Reflection = Screen Space.
Global Illumination = Ray Traced, Reflection = Ray Traced.

コメントより情報いただきました。ありがとうございます。

Kajisanさん
It was told somewhere in the early-access release video that things like transparency and reflections may not work or work as intended, yet – and are under construction.
訳：現状のLumenは不完全であり、今後対応されていくと。