Need help for Invisible material

Development Rendering
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Invisible material that blocks light completely - you mean it will cast shadows while it’s hidden in game? Not exactly what you asked for, but I don’t know about material. Whole actor can be setup like that. If so then - go to the

  1. DetailsPanel → Lighting → CastShadow (true)
  2. DetailsPanel → Lighting → HiddenShadow (true)
  3. DetailsPanel → Rendering → ActorHiddenInGame (true)

You can modify this parameters runtime via blueprints.