function ace_do_circle(pos, radius)
    local x = radius
    local y = 0
    local radiusError = 1-x

    while x >= y do
        minetest.set_node({x = x + pos.x, y = pos.y, z = y + pos.z}, {name = "default:bedrock"})
        minetest.set_node({x = y + pos.x, y = pos.y, z = x + pos.z}, {name = "default:bedrock"})
        minetest.set_node({x = -x + pos.x, y = pos.y, z = y + pos.z}, {name = "default:bedrock"})
        minetest.set_node({x = -y + pos.x, y = pos.y, z = x + pos.z}, {name = "default:bedrock"})
        minetest.set_node({x = -x + pos.x, y = pos.y, z = -y + pos.z}, {name = "default:bedrock"})
        minetest.set_node({x = -y + pos.x, y = pos.y, z = -x + pos.z}, {name = "default:bedrock"})
        minetest.set_node({x = x + pos.x, y = pos.y, z = y + pos.z}, {name = "default:bedrock"})
        minetest.set_node({x = y + pos.x, y = pos.y, z = x + pos.z}, {name = "default:bedrock"})
        y = y + 1
        if radiusError < 0 then
            radiusError = radiusError + 2 * y + 1
        else
            x = x - 1
            radiusError = radiusError + 2 * (y - x + 1)
        end
    end
end