--Default
minetest.override_item ("default:leaves",{
walkable = false,
})

-- Jungle :
minetest.override_item ("default:jungleleaves",{
walkable = false,
})

--Acacia
minetest.override_item ("default:acacia_leaves",{
walkable = false,
})

-- Aspen
minetest.override_item ("default:aspen_leaves",{
walkable = false,
})