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add get_surface lua function #640
here is the function in lua
-- a lua rewrite of sapier's get_surface() proposal, see: -- https://github.com/sapier/minetest/blob/c6f814b52a5e2b2f12c76215db3524571c56fe20/src/environment.cpp#L868 function get_surface(basepos, searchup, walkable_only) local max = searchup + basepos.y local last_node = minetest.get_node(basepos) local node = last_node local runpos = basepos local last_was_walkable = minetest.registered_nodes[node.name].walkable while ( runpos.y < max and minetest.get_content_id(node.name) ~= c_air ) do runpos.y = runpos.y + 1 last_node = node node = minetest.get_node(runpos) if not (walkable_only) then if minetest.get_content_id(last_node.name) ~= c_air and minetest.get_content_id(last_node.name) ~= c_ignore and minetest.get_content_id(node.name) == c_air then return runpos.y end else local is_walkable = minetest.registered_nodes[node.name].walkable if last_was_walkable and not is_walkable then return runpos.y end last_was_walkable = is_walkable end end return basepos.y - 1 end
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