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Trying to get the Custom Concrete with windowglass glass floor to block rain. Found the mod RainBeGone. Figured would try to figure this out.
Open RainBeGone's NFGlassFloor01.nif in Nifscope and Concrete with window glass's ConcreteMidRoofA_glass.nif.
In NFGlassFloor01.nif find at the bottom BSTriShape with the name RainB.
Right click the last BSTrishape->Block->Copy Branch'
In ConcreteMidRoofA_glass.nif at the top 0NiNode
Right click 0NiNode->Block->Paste Branch.
Save ConcreteMidRoofA_glass.nif
No idea if it works for settler happiness or not, but it blocks rain :D
Posted in the Concrete with window glass comments.