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We use this setting when we do not want player-controlled zeds to see certain areas of the map, or if the collision makes it difficult for a player-controlled zed to navigate into the play space.
Your spawn volumes should also take into consideration which zeds you want to spawn in that part of the map. So if you don't want husks and sirens to spawn on rooftops, then you need to set the volume on the rooftop to use the Small squad size.
KFVersusNoGoVolume
For the spawn volumes in the background facade where you DO want player-controlled zeds to spawn, you will need to add a KFVersusNoGoVolume to encompass that spawn area. This volume has several purposes:
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