techages/mods/ENTITIES/mobs_mc/5_spawn_abm_check.lua

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function mobs:spawn_abm_check(pos, node, name)
-- Don't spawn monsters on mycelium
if (node.name == "mcl_core:mycelium" or node.name == "mcl_core:mycelium_snow") and minetest.registered_entities[name].type == "monster" then
return true
-- Spawn on opaque or liquid nodes
elseif minetest.get_item_group(node.name, "opaque") ~= 0 or minetest.registered_nodes[node.name].liquidtype ~= "none" then
return false
end
-- Reject everything else
return true
end