Order does matter when using BSP brushes, more about that can be found in the documentation: https://docs.unrealengine.com/latest/INT/Engine/Actors/Brushes/index.html?lang=ja#brushorder
Order does matter when using BSP brushes, more about that can be found in the documentation: https://docs.unrealengine.com/latest/INT/Engine/Actors/Brushes/index.html?lang=ja#brushorder