minetest-mm/mods/biome_lib/search_functions.lua

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-- function to decide if a node has a wall that's in verticals_list{}
-- returns wall direction of valid node, or nil if invalid.
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function biome_lib.find_adjacent_wall(pos, verticals, randomflag)
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local verts = dump(verticals)
if randomflag then
local walltab = {}
if string.find(verts, minetest.get_node({ x=pos.x-1, y=pos.y, z=pos.z }).name) then walltab[#walltab + 1] = 3 end
if string.find(verts, minetest.get_node({ x=pos.x+1, y=pos.y, z=pos.z }).name) then walltab[#walltab + 1] = 2 end
if string.find(verts, minetest.get_node({ x=pos.x , y=pos.y, z=pos.z-1 }).name) then walltab[#walltab + 1] = 5 end
if string.find(verts, minetest.get_node({ x=pos.x , y=pos.y, z=pos.z+1 }).name) then walltab[#walltab + 1] = 4 end
if #walltab > 0 then return walltab[math.random(1, #walltab)] end
else
if string.find(verts, minetest.get_node({ x=pos.x-1, y=pos.y, z=pos.z }).name) then return 3 end
if string.find(verts, minetest.get_node({ x=pos.x+1, y=pos.y, z=pos.z }).name) then return 2 end
if string.find(verts, minetest.get_node({ x=pos.x , y=pos.y, z=pos.z-1 }).name) then return 5 end
if string.find(verts, minetest.get_node({ x=pos.x , y=pos.y, z=pos.z+1 }).name) then return 4 end
end
return nil
end
-- Function to search downward from the given position, looking for the first
-- node that matches the ground table. Returns the new position, or nil if
-- height limit is exceeded before finding it.
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function biome_lib.search_downward(pos, heightlimit, ground)
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for i = 0, heightlimit do
if string.find(dump(ground), minetest.get_node({x=pos.x, y=pos.y-i, z = pos.z}).name) then
return {x=pos.x, y=pos.y-i, z = pos.z}
end
end
return false
end
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function biome_lib.find_open_side(pos)
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if minetest.get_node({ x=pos.x-1, y=pos.y, z=pos.z }).name == "air" then
return {newpos = { x=pos.x-1, y=pos.y, z=pos.z }, facedir = 2}
end
if minetest.get_node({ x=pos.x+1, y=pos.y, z=pos.z }).name == "air" then
return {newpos = { x=pos.x+1, y=pos.y, z=pos.z }, facedir = 3}
end
if minetest.get_node({ x=pos.x, y=pos.y, z=pos.z-1 }).name == "air" then
return {newpos = { x=pos.x, y=pos.y, z=pos.z-1 }, facedir = 4}
end
if minetest.get_node({ x=pos.x, y=pos.y, z=pos.z+1 }).name == "air" then
return {newpos = { x=pos.x, y=pos.y, z=pos.z+1 }, facedir = 5}
end
return nil
end