Emissive material only visible to Lumen (invisible in game)

5.1 Added AffectIndirectLightingWhileHidden. Release Notes.

Added an AffectIndirectLightingWhileHidden property to the Primitive Component, which allows hidden primitives to be injected into Global Illumination (GI) and Reflections. This is useful as an extra art direction tool to create cheap invisible area lights through GI.

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