Is it possible to have mesh with emissive material to be invisible for camera and maybe reflections too?
To exclude object from camera but keep it for lumen, set “Owner only see” parameter to true.
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We added AffectIndirectLightingWhileHidden in 5.1 for this. Keep in mind, that screen space traces will still pick up that object, as they will anything visible on screen.
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is there a way to make an emissive not affect any lighting?