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Add check for presence of minetest.get_node_boxes before attempting sub-node space checks
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@ -561,6 +561,9 @@ local function has_room(self,pos)
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local n = #minetest.find_nodes_in_area(p1,p2,nodes) or 0
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if n == ( dx * dz * dz ) then return true end
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-- If we don't have an implementation of get_node_boxes, we can't check for sub-node space
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if not minetest.get_node_boxes then return false end
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-- Make sure the entire volume except for the top level is free before checking the top layer
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if dy > 1 then
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n = #minetest.find_nodes_in_area(p1, vector.offset(p2, 0, -1, 0), nodes)
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